{"id":5400,"date":"2021-07-14T16:40:38","date_gmt":"2021-07-14T08:40:38","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=5400"},"modified":"2021-07-14T16:40:38","modified_gmt":"2021-07-14T08:40:38","slug":"etcd%ef%bc%9a%e4%bb%8e%e5%ba%94%e7%94%a8%e5%9c%ba%e6%99%af%e5%88%b0%e5%ae%9e%e7%8e%b0%e5%8e%9f%e7%90%86%e7%9a%84%e5%85%a8%e6%96%b9%e4%bd%8d%e8%a7%a3%e8%af%bb","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5400","title":{"rendered":"etcd\uff1a\u4ece\u5e94\u7528\u573a\u666f\u5230\u5b9e\u73b0\u539f\u7406\u7684\u5168\u65b9\u4f4d\u89e3\u8bfb"},"content":{"rendered":"<div class=\"article-widget-head\" data-v-00e14dad=\"\" data-v-4169f0eb=\"\" data-v-453a4212=\"\">\n<p class=\"article-title\"><a href=\"https:\/\/www.infoq.cn\/article\/etcd-interpretation-application-scenario-implement-principle\/\">\u539f\u6587\u5730\u5740<\/a><\/p>\n<p>&nbsp;<\/p>\n<ul class=\"author\" data-v-00e14dad=\"\">\n<li data-v-00e14dad=\"\"><a class=\"com-author-name\" data-v-21753c9e=\"\" data-v-72304aa2=\"\" data-v-00e14dad=\"\">\u5b59\u5065\u6ce2<\/a><\/li>\n<\/ul>\n<p class=\"head-detail date-channel-detail\" data-v-00e14dad=\"\"><span class=\"date\" data-v-00e14dad=\"\"><i class=\"iconfont\" data-v-00e14dad=\"\">\ue6b4<\/i>2015 \u5e74 1 \u6708 30 \u65e5<\/span><\/p>\n<div class=\"com-channel-tag-list channel-tag-list\" data-v-47bbeab2=\"\" data-v-00e14dad=\"\"><i class=\"iconfont\" data-v-47bbeab2=\"\">\ue640<\/i><a class=\"com-topic-title topic-tag-title\" href=\"https:\/\/www.infoq.cn\/topic\/development\" data-v-ba6fc118=\"\" data-v-47bbeab2=\"\">\u8bed\u8a00 &amp; \u5f00\u53d1<\/a><a class=\"com-topic-title topic-tag-title\" href=\"https:\/\/www.infoq.cn\/topic\/architecture\" data-v-ba6fc118=\"\" data-v-47bbeab2=\"\">\u67b6\u6784<\/a><a class=\"com-topic-title topic-tag-title\" href=\"https:\/\/www.infoq.cn\/topic\/Kubernetes\" data-v-ba6fc118=\"\" data-v-47bbeab2=\"\">Kubernetes<\/a><\/div>\n<\/div>\n<div class=\"article-content-wrap\" data-v-4169f0eb=\"\" data-v-453a4212=\"\">\n<div class=\"content-preview size-base\" data-v-1d55b616=\"\" data-v-4169f0eb=\"\" data-v-453a4212=\"\">\n<div class=\"article-typo\" data-v-1d55b616=\"\">\n<p>\u968f\u7740 CoreOS \u548c Kubernetes \u7b49\u9879\u76ee\u5728\u5f00\u6e90\u793e\u533a\u65e5\u76ca\u706b\u70ed\uff0c\u5b83\u4eec\u9879\u76ee\u4e2d\u90fd\u7528\u5230\u7684 etcd \u7ec4\u4ef6\u4f5c\u4e3a\u4e00\u4e2a\u9ad8\u53ef\u7528\u5f3a\u4e00\u81f4\u6027\u7684\u670d\u52a1\u53d1\u73b0\u5b58\u50a8\u4ed3\u5e93\uff0c\u6e10\u6e10\u4e3a\u5f00\u53d1\u4eba\u5458\u6240\u5173\u6ce8\u3002\u5728\u4e91\u8ba1\u7b97\u65f6\u4ee3\uff0c\u5982\u4f55\u8ba9\u670d\u52a1\u5feb\u901f\u900f\u660e\u5730\u63a5\u5165\u5230\u8ba1\u7b97\u96c6\u7fa4\u4e2d\uff0c\u5982\u4f55\u8ba9\u5171\u4eab\u914d\u7f6e\u4fe1\u606f\u5feb\u901f\u88ab\u96c6\u7fa4\u4e2d\u7684\u6240\u6709\u673a\u5668\u53d1\u73b0\uff0c\u66f4\u4e3a\u91cd\u8981\u7684\u662f\uff0c\u5982\u4f55\u6784\u5efa\u8fd9\u6837\u4e00\u5957\u9ad8\u53ef\u7528\u3001\u5b89\u5168\u3001\u6613\u4e8e\u90e8\u7f72\u4ee5\u53ca\u54cd\u5e94\u5feb\u901f\u7684\u670d\u52a1\u96c6\u7fa4\uff0c\u5df2\u7ecf\u6210\u4e3a\u4e86\u8feb\u5207\u9700\u8981\u89e3\u51b3\u7684\u95ee\u9898\u3002etcd \u4e3a\u89e3\u51b3\u8fd9\u7c7b\u95ee\u9898\u5e26\u6765\u4e86\u798f\u97f3\uff0c\u672c\u6587\u5c06\u4ece etcd \u7684\u5e94\u7528\u573a\u666f\u5f00\u59cb\uff0c\u6df1\u5165\u89e3\u8bfb etcd \u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u4ee5\u4f9b\u5f00\u53d1\u8005\u4eec\u66f4\u4e3a\u5145\u5206\u5730\u4eab\u7528 etcd \u6240\u5e26\u6765\u7684\u4fbf\u5229\u3002<\/p>\n<h2 id=\"heading0\" data-id-_0671dd886b43=\"1\">\u7ecf\u5178\u5e94\u7528\u573a\u666f<\/h2>\n<p>\u8981\u95ee etcd \u662f\u4ec0\u4e48\uff1f\u5f88\u591a\u4eba\u7b2c\u4e00\u53cd\u5e94\u53ef\u80fd\u662f\u4e00\u4e2a\u952e\u503c\u5b58\u50a8\u4ed3\u5e93\uff0c\u5374\u6ca1\u6709\u91cd\u89c6\u5b98\u65b9\u5b9a\u4e49\u7684\u540e\u534a\u53e5\uff0c\u7528\u4e8e\u914d\u7f6e\u5171\u4eab\u548c\u670d\u52a1\u53d1\u73b0\u3002<\/p>\n<p><strong>A highly-available key value store for shared configuration and service discovery.<\/strong><\/p>\n<p>\u5b9e\u9645\u4e0a\uff0cetcd \u4f5c\u4e3a\u4e00\u4e2a\u53d7\u5230 ZooKeeper \u4e0e doozer \u542f\u53d1\u800c\u50ac\u751f\u7684\u9879\u76ee\uff0c\u9664\u4e86\u62e5\u6709\u4e0e\u4e4b\u7c7b\u4f3c\u7684\u529f\u80fd\u5916\uff0c\u66f4\u4e13\u6ce8\u4e8e\u4ee5\u4e0b\u56db\u70b9\u3002<\/p>\n<ul>\n<li>\u7b80\u5355\uff1a\u57fa\u4e8e HTTP+JSON \u7684 API \u8ba9\u4f60\u7528 curl \u5c31\u53ef\u4ee5\u8f7b\u677e\u4f7f\u7528\u3002<\/li>\n<li>\u5b89\u5168\uff1a\u53ef\u9009 SSL \u5ba2\u6237\u8ba4\u8bc1\u673a\u5236\u3002<\/li>\n<li>\u5feb\u901f\uff1a\u6bcf\u4e2a\u5b9e\u4f8b\u6bcf\u79d2\u652f\u6301\u4e00\u5343\u6b21\u5199\u64cd\u4f5c\u3002<\/li>\n<li>\u53ef\u4fe1\uff1a\u4f7f\u7528 Raft \u7b97\u6cd5\u5145\u5206\u5b9e\u73b0\u4e86\u5206\u5e03\u5f0f\u3002<\/li>\n<\/ul>\n<p>\u968f\u7740\u4e91\u8ba1\u7b97\u7684\u4e0d\u65ad\u53d1\u5c55\uff0c\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u6d89\u53ca\u5230\u7684\u95ee\u9898\u8d8a\u6765\u8d8a\u53d7\u5230\u4eba\u4eec\u91cd\u89c6\u3002\u53d7\u963f\u91cc\u4e2d\u95f4\u4ef6\u56e2\u961f\u5bf9<a href=\"http:\/\/jm-blog.aliapp.com\/?p=1232\" target=\"_blank\" rel=\"noopener nofollow\">\u00a0ZooKeeper \u5178\u578b\u5e94\u7528\u573a\u666f\u4e00\u89c8<\/a>\u4e00\u6587\u7684\u542f\u53d1\uff0c\u7b14\u8005\u6839\u636e\u81ea\u5df1\u7684\u7406\u89e3\u4e5f\u603b\u7ed3\u4e86\u4e00\u4e9b etcd \u7684\u7ecf\u5178\u4f7f\u7528\u573a\u666f\u3002\u8ba9\u6211\u4eec\u6765\u770b\u770b etcd \u8fd9\u4e2a\u57fa\u4e8e Raft \u5f3a\u4e00\u81f4\u6027\u7b97\u6cd5\u7684\u5206\u5e03\u5f0f\u5b58\u50a8\u4ed3\u5e93\u80fd\u7ed9\u6211\u4eec\u5e26\u6765\u54ea\u4e9b\u5e2e\u52a9\u3002<\/p>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7684\u6570\u636e\u5206\u4e3a\u63a7\u5236\u6570\u636e\u548c\u5e94\u7528\u6570\u636e\u3002<strong>\u4f7f\u7528 etcd \u7684\u573a\u666f\u9ed8\u8ba4\u5904\u7406\u7684\u6570\u636e\u90fd\u662f\u63a7\u5236\u6570\u636e\uff0c\u5bf9\u4e8e\u5e94\u7528\u6570\u636e\uff0c\u53ea\u63a8\u8350\u6570\u636e\u91cf\u5f88\u5c0f\uff0c\u4f46\u662f\u66f4\u65b0\u8bbf\u95ee\u9891\u7e41\u7684\u60c5\u51b5<\/strong>\u3002<\/p>\n<h3 id=\"heading1\" data-id-_cce0987f7bb8=\"1\">\u573a\u666f\u4e00\uff1a\u670d\u52a1\u53d1\u73b0\uff08Service Discovery\uff09<\/h3>\n<p>\u670d\u52a1\u53d1\u73b0\u8981\u89e3\u51b3\u7684\u4e5f\u662f\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u6700\u5e38\u89c1\u7684\u95ee\u9898\u4e4b\u4e00\uff0c\u5373\u5728\u540c\u4e00\u4e2a\u5206\u5e03\u5f0f\u96c6\u7fa4\u4e2d\u7684\u8fdb\u7a0b\u6216\u670d\u52a1\uff0c\u8981\u5982\u4f55\u624d\u80fd\u627e\u5230\u5bf9\u65b9\u5e76\u5efa\u7acb\u8fde\u63a5\u3002\u672c\u8d28\u4e0a\u6765\u8bf4\uff0c\u670d\u52a1\u53d1\u73b0\u5c31\u662f\u60f3\u8981\u4e86\u89e3\u96c6\u7fa4\u4e2d\u662f\u5426\u6709\u8fdb\u7a0b\u5728\u76d1\u542c udp \u6216 tcp \u7aef\u53e3\uff0c\u5e76\u4e14\u901a\u8fc7\u540d\u5b57\u5c31\u53ef\u4ee5\u67e5\u627e\u548c\u8fde\u63a5\u3002\u8981\u89e3\u51b3\u670d\u52a1\u53d1\u73b0\u7684\u95ee\u9898\uff0c\u9700\u8981\u6709\u4e0b\u9762\u4e09\u5927\u652f\u67f1\uff0c\u7f3a\u4e00\u4e0d\u53ef\u3002<\/p>\n<ol>\n<li><strong>\u4e00\u4e2a\u5f3a\u4e00\u81f4\u6027\u3001\u9ad8\u53ef\u7528\u7684\u670d\u52a1\u5b58\u50a8\u76ee\u5f55<\/strong>\u3002\u57fa\u4e8e Raft \u7b97\u6cd5\u7684 etcd \u5929\u751f\u5c31\u662f\u8fd9\u6837\u4e00\u4e2a\u5f3a\u4e00\u81f4\u6027\u9ad8\u53ef\u7528\u7684\u670d\u52a1\u5b58\u50a8\u76ee\u5f55\u3002<\/li>\n<li><strong>\u4e00\u79cd\u6ce8\u518c\u670d\u52a1\u548c\u76d1\u63a7\u670d\u52a1\u5065\u5eb7\u72b6\u6001\u7684\u673a\u5236<\/strong>\u3002\u7528\u6237\u53ef\u4ee5\u5728 etcd \u4e2d\u6ce8\u518c\u670d\u52a1\uff0c\u5e76\u4e14\u5bf9\u6ce8\u518c\u7684\u670d\u52a1\u8bbe\u7f6e<code>key TTL<\/code>\uff0c\u5b9a\u65f6\u4fdd\u6301\u670d\u52a1\u7684\u5fc3\u8df3\u4ee5\u8fbe\u5230\u76d1\u63a7\u5065\u5eb7\u72b6\u6001\u7684\u6548\u679c\u3002<\/li>\n<li><strong>\u4e00\u79cd\u67e5\u627e\u548c\u8fde\u63a5\u670d\u52a1\u7684\u673a\u5236<\/strong>\u3002\u901a\u8fc7\u5728 etcd \u6307\u5b9a\u7684\u4e3b\u9898\u4e0b\u6ce8\u518c\u7684\u670d\u52a1\u4e5f\u80fd\u5728\u5bf9\u5e94\u7684\u4e3b\u9898\u4e0b\u67e5\u627e\u5230\u3002\u4e3a\u4e86\u786e\u4fdd\u8fde\u63a5\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u6bcf\u4e2a\u670d\u52a1\u673a\u5668\u4e0a\u90fd\u90e8\u7f72\u4e00\u4e2a Proxy \u6a21\u5f0f\u7684 etcd\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u786e\u4fdd\u80fd\u8bbf\u95ee etcd \u96c6\u7fa4\u7684\u670d\u52a1\u90fd\u80fd\u4e92\u76f8\u8fde\u63a5\u3002<\/li>\n<\/ol>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/1b\/7d\/1beabef5a1168cdc43766903e65f907d.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 1 \u670d\u52a1\u53d1\u73b0\u793a\u610f\u56fe<\/strong><\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u6765\u770b\u670d\u52a1\u53d1\u73b0\u5bf9\u5e94\u7684\u5177\u4f53\u573a\u666f\u3002<\/p>\n<ul>\n<li><strong>\u5fae\u670d\u52a1\u534f\u540c\u5de5\u4f5c\u67b6\u6784\u4e2d\uff0c\u670d\u52a1\u52a8\u6001\u6dfb\u52a0<\/strong>\u3002\u968f\u7740 Docker \u5bb9\u5668\u7684\u6d41\u884c\uff0c\u591a\u79cd\u5fae\u670d\u52a1\u5171\u540c\u534f\u4f5c\uff0c\u6784\u6210\u4e00\u4e2a\u76f8\u5bf9\u529f\u80fd\u5f3a\u5927\u7684\u67b6\u6784\u7684\u6848\u4f8b\u8d8a\u6765\u8d8a\u591a\u3002\u900f\u660e\u5316\u7684\u52a8\u6001\u6dfb\u52a0\u8fd9\u4e9b\u670d\u52a1\u7684\u9700\u6c42\u4e5f\u65e5\u76ca\u5f3a\u70c8\u3002\u901a\u8fc7\u670d\u52a1\u53d1\u73b0\u673a\u5236\uff0c\u5728 etcd \u4e2d\u6ce8\u518c\u67d0\u4e2a\u670d\u52a1\u540d\u5b57\u7684\u76ee\u5f55\uff0c\u5728\u8be5\u76ee\u5f55\u4e0b\u5b58\u50a8\u53ef\u7528\u7684\u670d\u52a1\u8282\u70b9\u7684 IP\u3002\u5728\u4f7f\u7528\u670d\u52a1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u53ea\u8981\u4ece\u670d\u52a1\u76ee\u5f55\u4e0b\u67e5\u627e\u53ef\u7528\u7684\u670d\u52a1\u8282\u70b9\u53bb\u4f7f\u7528\u5373\u53ef\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/e7\/d8\/e7d6918c1c9b7c9f2829779966ffb5d8.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 2 \u5fae\u670d\u52a1\u534f\u540c\u5de5\u4f5c<\/strong><\/p>\n<ul>\n<li><strong>PaaS \u5e73\u53f0\u4e2d\u5e94\u7528\u591a\u5b9e\u4f8b\u4e0e\u5b9e\u4f8b\u6545\u969c\u91cd\u542f\u900f\u660e\u5316<\/strong>\u3002PaaS \u5e73\u53f0\u4e2d\u7684\u5e94\u7528\u4e00\u822c\u90fd\u6709\u591a\u4e2a\u5b9e\u4f8b\uff0c\u901a\u8fc7\u57df\u540d\uff0c\u4e0d\u4ec5\u53ef\u4ee5\u900f\u660e\u7684\u5bf9\u8fd9\u591a\u4e2a\u5b9e\u4f8b\u8fdb\u884c\u8bbf\u95ee\uff0c\u800c\u4e14\u8fd8\u53ef\u4ee5\u505a\u5230\u8d1f\u8f7d\u5747\u8861\u3002\u4f46\u662f\u5e94\u7528\u7684\u67d0\u4e2a\u5b9e\u4f8b\u968f\u65f6\u90fd\u6709\u53ef\u80fd\u6545\u969c\u91cd\u542f\uff0c\u8fd9\u65f6\u5c31\u9700\u8981\u52a8\u6001\u7684\u914d\u7f6e\u57df\u540d\u89e3\u6790\uff08\u8def\u7531\uff09\u4e2d\u7684\u4fe1\u606f\u3002\u901a\u8fc7 etcd \u7684\u670d\u52a1\u53d1\u73b0\u529f\u80fd\u5c31\u53ef\u4ee5\u8f7b\u677e\u89e3\u51b3\u8fd9\u4e2a\u52a8\u6001\u914d\u7f6e\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/ec\/68\/ecea22c641122ee933e4d1a2f4c6ce68.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 3 \u4e91\u5e73\u53f0\u591a\u5b9e\u4f8b\u900f\u660e\u5316<\/strong><\/p>\n<h3 id=\"heading2\" data-id-_f942b2171c2b=\"1\">\u573a\u666f\u4e8c\uff1a\u6d88\u606f\u53d1\u5e03\u4e0e\u8ba2\u9605<\/h3>\n<p>\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u6700\u9002\u7528\u7684\u4e00\u79cd\u7ec4\u4ef6\u95f4\u901a\u4fe1\u65b9\u5f0f\u5c31\u662f\u6d88\u606f\u53d1\u5e03\u4e0e\u8ba2\u9605\u3002\u5373\u6784\u5efa\u4e00\u4e2a\u914d\u7f6e\u5171\u4eab\u4e2d\u5fc3\uff0c\u6570\u636e\u63d0\u4f9b\u8005\u5728\u8fd9\u4e2a\u914d\u7f6e\u4e2d\u5fc3\u53d1\u5e03\u6d88\u606f\uff0c\u800c\u6d88\u606f\u4f7f\u7528\u8005\u5219\u8ba2\u9605\u4ed6\u4eec\u5173\u5fc3\u7684\u4e3b\u9898\uff0c\u4e00\u65e6\u4e3b\u9898\u6709\u6d88\u606f\u53d1\u5e03\uff0c\u5c31\u4f1a\u5b9e\u65f6\u901a\u77e5\u8ba2\u9605\u8005\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u505a\u5230\u5206\u5e03\u5f0f\u7cfb\u7edf\u914d\u7f6e\u7684\u96c6\u4e2d\u5f0f\u7ba1\u7406\u4e0e\u52a8\u6001\u66f4\u65b0\u3002<\/p>\n<ul>\n<li><strong>\u5e94\u7528\u4e2d\u7528\u5230\u7684\u4e00\u4e9b\u914d\u7f6e\u4fe1\u606f\u653e\u5230 etcd \u4e0a\u8fdb\u884c\u96c6\u4e2d\u7ba1\u7406<\/strong>\u3002\u8fd9\u7c7b\u573a\u666f\u7684\u4f7f\u7528\u65b9\u5f0f\u901a\u5e38\u662f\u8fd9\u6837\uff1a\u5e94\u7528\u5728\u542f\u52a8\u7684\u65f6\u5019\u4e3b\u52a8\u4ece etcd \u83b7\u53d6\u4e00\u6b21\u914d\u7f6e\u4fe1\u606f\uff0c\u540c\u65f6\uff0c\u5728 etcd \u8282\u70b9\u4e0a\u6ce8\u518c\u4e00\u4e2a Watcher \u5e76\u7b49\u5f85\uff0c\u4ee5\u540e\u6bcf\u6b21\u914d\u7f6e\u6709\u66f4\u65b0\u7684\u65f6\u5019\uff0cetcd \u90fd\u4f1a\u5b9e\u65f6\u901a\u77e5\u8ba2\u9605\u8005\uff0c\u4ee5\u6b64\u8fbe\u5230\u83b7\u53d6\u6700\u65b0\u914d\u7f6e\u4fe1\u606f\u7684\u76ee\u7684\u3002<\/li>\n<li>\u5206\u5e03\u5f0f\u641c\u7d22\u670d\u52a1\u4e2d\uff0c<strong>\u7d22\u5f15\u7684\u5143\u4fe1\u606f\u548c\u670d\u52a1\u5668\u96c6\u7fa4\u673a\u5668\u7684\u8282\u70b9\u72b6\u6001\u5b58\u653e\u5728 etcd \u4e2d<\/strong>\uff0c\u4f9b\u5404\u4e2a\u5ba2\u6237\u7aef\u8ba2\u9605\u4f7f\u7528\u3002\u4f7f\u7528 etcd \u7684<code>key TTL<\/code>\u529f\u80fd\u53ef\u4ee5\u786e\u4fdd\u673a\u5668\u72b6\u6001\u662f\u5b9e\u65f6\u66f4\u65b0\u7684\u3002<\/li>\n<li><strong>\u5206\u5e03\u5f0f\u65e5\u5fd7\u6536\u96c6\u7cfb\u7edf<\/strong>\u3002\u8fd9\u4e2a\u7cfb\u7edf\u7684\u6838\u5fc3\u5de5\u4f5c\u662f\u6536\u96c6\u5206\u5e03\u5728\u4e0d\u540c\u673a\u5668\u7684\u65e5\u5fd7\u3002\u6536\u96c6\u5668\u901a\u5e38\u662f\u6309\u7167\u5e94\u7528\uff08\u6216\u4e3b\u9898\uff09\u6765\u5206\u914d\u6536\u96c6\u4efb\u52a1\u5355\u5143\uff0c\u56e0\u6b64\u53ef\u4ee5\u5728 etcd \u4e0a\u521b\u5efa\u4e00\u4e2a\u4ee5\u5e94\u7528\uff08\u4e3b\u9898\uff09\u547d\u540d\u7684\u76ee\u5f55 P\uff0c\u5e76\u5c06\u8fd9\u4e2a\u5e94\u7528\uff08\u4e3b\u9898\u76f8\u5173\uff09\u7684\u6240\u6709\u673a\u5668 ip\uff0c\u4ee5\u5b50\u76ee\u5f55\u7684\u5f62\u5f0f\u5b58\u50a8\u5230\u76ee\u5f55 P \u4e0a\uff0c\u7136\u540e\u8bbe\u7f6e\u4e00\u4e2a etcd \u9012\u5f52\u7684 Watcher\uff0c\u9012\u5f52\u5f0f\u7684\u76d1\u63a7\u5e94\u7528\uff08\u4e3b\u9898\uff09\u76ee\u5f55\u4e0b\u6240\u6709\u4fe1\u606f\u7684\u53d8\u52a8\u3002\u8fd9\u6837\u5c31\u5b9e\u73b0\u4e86\u673a\u5668 IP\uff08\u6d88\u606f\uff09\u53d8\u52a8\u7684\u65f6\u5019\uff0c\u80fd\u591f\u5b9e\u65f6\u901a\u77e5\u5230\u6536\u96c6\u5668\u8c03\u6574\u4efb\u52a1\u5206\u914d\u3002<\/li>\n<li><strong>\u7cfb\u7edf\u4e2d\u4fe1\u606f\u9700\u8981\u52a8\u6001\u81ea\u52a8\u83b7\u53d6\u4e0e\u4eba\u5de5\u5e72\u9884\u4fee\u6539\u4fe1\u606f\u8bf7\u6c42\u5185\u5bb9\u7684\u60c5\u51b5\u3002<\/strong>\u901a\u5e38\u662f\u66b4\u9732\u51fa\u63a5\u53e3\uff0c\u4f8b\u5982 JMX \u63a5\u53e3\uff0c\u6765\u83b7\u53d6\u4e00\u4e9b\u8fd0\u884c\u65f6\u7684\u4fe1\u606f\u3002\u5f15\u5165 etcd \u4e4b\u540e\uff0c\u5c31\u4e0d\u7528\u81ea\u5df1\u5b9e\u73b0\u4e00\u5957\u65b9\u6848\u4e86\uff0c\u53ea\u8981\u5c06\u8fd9\u4e9b\u4fe1\u606f\u5b58\u653e\u5230\u6307\u5b9a\u7684 etcd \u76ee\u5f55\u4e2d\u5373\u53ef\uff0cetcd \u7684\u8fd9\u4e9b\u76ee\u5f55\u5c31\u53ef\u4ee5\u901a\u8fc7 HTTP \u7684\u63a5\u53e3\u5728\u5916\u90e8\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/5f\/0b\/5fb77bf6f5751c45f44cbe9df8ee250b.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 4 \u6d88\u606f\u53d1\u5e03\u4e0e\u8ba2\u9605<\/strong><\/p>\n<h3 id=\"heading3\" data-id-_c1551f2fb302=\"1\">\u573a\u666f\u4e09\uff1a\u8d1f\u8f7d\u5747\u8861<\/h3>\n<p>\u5728<code>\u573a\u666f\u4e00<\/code>\u4e2d\u4e5f\u63d0\u5230\u4e86\u8d1f\u8f7d\u5747\u8861\uff0c\u672c\u6587\u6240\u6307\u7684\u8d1f\u8f7d\u5747\u8861\u5747\u4e3a\u8f6f\u8d1f\u8f7d\u5747\u8861\u3002\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u670d\u52a1\u7684\u9ad8\u53ef\u7528\u4ee5\u53ca\u6570\u636e\u7684\u4e00\u81f4\u6027\uff0c\u901a\u5e38\u90fd\u4f1a\u628a\u6570\u636e\u548c\u670d\u52a1\u90e8\u7f72\u591a\u4efd\uff0c\u4ee5\u6b64\u8fbe\u5230\u5bf9\u7b49\u670d\u52a1\uff0c\u5373\u4f7f\u5176\u4e2d\u7684\u67d0\u4e00\u4e2a\u670d\u52a1\u5931\u6548\u4e86\uff0c\u4e5f\u4e0d\u5f71\u54cd\u4f7f\u7528\u3002\u7531\u6b64\u5e26\u6765\u7684\u574f\u5904\u662f\u6570\u636e\u5199\u5165\u6027\u80fd\u4e0b\u964d\uff0c\u800c\u597d\u5904\u5219\u662f\u6570\u636e\u8bbf\u95ee\u65f6\u7684\u8d1f\u8f7d\u5747\u8861\u3002\u56e0\u4e3a\u6bcf\u4e2a\u5bf9\u7b49\u670d\u52a1\u8282\u70b9\u4e0a\u90fd\u5b58\u6709\u5b8c\u6574\u7684\u6570\u636e\uff0c\u6240\u4ee5\u7528\u6237\u7684\u8bbf\u95ee\u6d41\u91cf\u5c31\u53ef\u4ee5\u5206\u6d41\u5230\u4e0d\u540c\u7684\u673a\u5668\u4e0a\u3002<\/p>\n<ul>\n<li><strong>etcd \u672c\u8eab\u5206\u5e03\u5f0f\u67b6\u6784\u5b58\u50a8\u7684\u4fe1\u606f\u8bbf\u95ee\u652f\u6301\u8d1f\u8f7d\u5747\u8861<\/strong>\u3002etcd \u96c6\u7fa4\u5316\u4ee5\u540e\uff0c\u6bcf\u4e2a etcd \u7684\u6838\u5fc3\u8282\u70b9\u90fd\u53ef\u4ee5\u5904\u7406\u7528\u6237\u7684\u8bf7\u6c42\u3002\u6240\u4ee5\uff0c\u628a\u6570\u636e\u91cf\u5c0f\u4f46\u662f\u8bbf\u95ee\u9891\u7e41\u7684\u6d88\u606f\u6570\u636e\u76f4\u63a5\u5b58\u50a8\u5230 etcd \u4e2d\u4e5f\u662f\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\uff0c\u5982\u4e1a\u52a1\u7cfb\u7edf\u4e2d\u5e38\u7528\u7684\u4e8c\u7ea7\u4ee3\u7801\u8868\uff08\u5728\u8868\u4e2d\u5b58\u50a8\u4ee3\u7801\uff0c\u5728 etcd \u4e2d\u5b58\u50a8\u4ee3\u7801\u6240\u4ee3\u8868\u7684\u5177\u4f53\u542b\u4e49\uff0c\u4e1a\u52a1\u7cfb\u7edf\u8c03\u7528\u67e5\u8868\u7684\u8fc7\u7a0b\uff0c\u5c31\u9700\u8981\u67e5\u627e\u8868\u4e2d\u4ee3\u7801\u7684\u542b\u4e49\uff09\u3002<\/li>\n<li><strong>\u5229\u7528 etcd \u7ef4\u62a4\u4e00\u4e2a\u8d1f\u8f7d\u5747\u8861\u8282\u70b9\u8868<\/strong>\u3002etcd \u53ef\u4ee5\u76d1\u63a7\u4e00\u4e2a\u96c6\u7fa4\u4e2d\u591a\u4e2a\u8282\u70b9\u7684\u72b6\u6001\uff0c\u5f53\u6709\u4e00\u4e2a\u8bf7\u6c42\u53d1\u8fc7\u6765\u540e\uff0c\u53ef\u4ee5\u8f6e\u8be2\u5f0f\u7684\u628a\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u5b58\u6d3b\u7740\u7684\u591a\u4e2a\u72b6\u6001\u3002\u7c7b\u4f3c KafkaMQ\uff0c\u901a\u8fc7 ZooKeeper \u6765\u7ef4\u62a4\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005\u7684\u8d1f\u8f7d\u5747\u8861\u3002\u540c\u6837\u4e5f\u53ef\u4ee5\u7528 etcd \u6765\u505a ZooKeeper \u7684\u5de5\u4f5c\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/67\/be\/6782904921fa103f42f30113fbf0babe.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 5 \u8d1f\u8f7d\u5747\u8861<\/strong><\/p>\n<h3 id=\"heading4\" data-id-_c7c7f1ecaa27=\"1\">\u573a\u666f\u56db\uff1a\u5206\u5e03\u5f0f\u901a\u77e5\u4e0e\u534f\u8c03<\/h3>\n<p>\u8fd9\u91cc\u8bf4\u5230\u7684\u5206\u5e03\u5f0f\u901a\u77e5\u4e0e\u534f\u8c03\uff0c\u4e0e\u6d88\u606f\u53d1\u5e03\u548c\u8ba2\u9605\u6709\u4e9b\u76f8\u4f3c\u3002\u90fd\u7528\u5230\u4e86 etcd \u4e2d\u7684 Watcher \u673a\u5236\uff0c\u901a\u8fc7\u6ce8\u518c\u4e0e\u5f02\u6b65\u901a\u77e5\u673a\u5236\uff0c\u5b9e\u73b0\u5206\u5e03\u5f0f\u73af\u5883\u4e0b\u4e0d\u540c\u7cfb\u7edf\u4e4b\u95f4\u7684\u901a\u77e5\u4e0e\u534f\u8c03\uff0c\u4ece\u800c\u5bf9\u6570\u636e\u53d8\u66f4\u505a\u5230\u5b9e\u65f6\u5904\u7406\u3002\u5b9e\u73b0\u65b9\u5f0f\u901a\u5e38\u662f\u8fd9\u6837\uff1a\u4e0d\u540c\u7cfb\u7edf\u90fd\u5728 etcd \u4e0a\u5bf9\u540c\u4e00\u4e2a\u76ee\u5f55\u8fdb\u884c\u6ce8\u518c\uff0c\u540c\u65f6\u8bbe\u7f6e Watcher \u89c2\u6d4b\u8be5\u76ee\u5f55\u7684\u53d8\u5316\uff08\u5982\u679c\u5bf9\u5b50\u76ee\u5f55\u7684\u53d8\u5316\u4e5f\u6709\u9700\u8981\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u9012\u5f52\u6a21\u5f0f\uff09\uff0c\u5f53\u67d0\u4e2a\u7cfb\u7edf\u66f4\u65b0\u4e86 etcd \u7684\u76ee\u5f55\uff0c\u90a3\u4e48\u8bbe\u7f6e\u4e86 Watcher \u7684\u7cfb\u7edf\u5c31\u4f1a\u6536\u5230\u901a\u77e5\uff0c\u5e76\u4f5c\u51fa\u76f8\u5e94\u5904\u7406\u3002<\/p>\n<ul>\n<li><strong>\u901a\u8fc7 etcd \u8fdb\u884c\u4f4e\u8026\u5408\u7684\u5fc3\u8df3\u68c0\u6d4b<\/strong>\u3002\u68c0\u6d4b\u7cfb\u7edf\u548c\u88ab\u68c0\u6d4b\u7cfb\u7edf\u901a\u8fc7 etcd \u4e0a\u67d0\u4e2a\u76ee\u5f55\u5173\u8054\u800c\u975e\u76f4\u63a5\u5173\u8054\u8d77\u6765\uff0c\u8fd9\u6837\u53ef\u4ee5\u5927\u5927\u51cf\u5c11\u7cfb\u7edf\u7684\u8026\u5408\u6027\u3002<\/li>\n<li><strong>\u901a\u8fc7 etcd \u5b8c\u6210\u7cfb\u7edf\u8c03\u5ea6<\/strong>\u3002\u67d0\u7cfb\u7edf\u6709\u63a7\u5236\u53f0\u548c\u63a8\u9001\u7cfb\u7edf\u4e24\u90e8\u5206\u7ec4\u6210\uff0c\u63a7\u5236\u53f0\u7684\u804c\u8d23\u662f\u63a7\u5236\u63a8\u9001\u7cfb\u7edf\u8fdb\u884c\u76f8\u5e94\u7684\u63a8\u9001\u5de5\u4f5c\u3002\u7ba1\u7406\u4eba\u5458\u5728\u63a7\u5236\u53f0\u4f5c\u7684\u4e00\u4e9b\u64cd\u4f5c\uff0c\u5b9e\u9645\u4e0a\u662f\u4fee\u6539\u4e86 etcd \u4e0a\u67d0\u4e9b\u76ee\u5f55\u8282\u70b9\u7684\u72b6\u6001\uff0c\u800c etcd \u5c31\u628a\u8fd9\u4e9b\u53d8\u5316\u901a\u77e5\u7ed9\u6ce8\u518c\u4e86 Watcher \u7684\u63a8\u9001\u7cfb\u7edf\u5ba2\u6237\u7aef\uff0c\u63a8\u9001\u7cfb\u7edf\u518d\u4f5c\u51fa\u76f8\u5e94\u7684\u63a8\u9001\u4efb\u52a1\u3002<\/li>\n<li><strong>\u901a\u8fc7 etcd \u5b8c\u6210\u5de5\u4f5c\u6c47\u62a5<\/strong>\u3002\u5927\u90e8\u5206\u7c7b\u4f3c\u7684\u4efb\u52a1\u5206\u53d1\u7cfb\u7edf\uff0c\u5b50\u4efb\u52a1\u542f\u52a8\u540e\uff0c\u5230 etcd \u6765\u6ce8\u518c\u4e00\u4e2a\u4e34\u65f6\u5de5\u4f5c\u76ee\u5f55\uff0c\u5e76\u4e14\u5b9a\u65f6\u5c06\u81ea\u5df1\u7684\u8fdb\u5ea6\u8fdb\u884c\u6c47\u62a5\uff08\u5c06\u8fdb\u5ea6\u5199\u5165\u5230\u8fd9\u4e2a\u4e34\u65f6\u76ee\u5f55\uff09\uff0c\u8fd9\u6837\u4efb\u52a1\u7ba1\u7406\u8005\u5c31\u80fd\u591f\u5b9e\u65f6\u77e5\u9053\u4efb\u52a1\u8fdb\u5ea6\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/38\/97\/38bee3d541dd88e6f772e64beab92697.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 6 \u5206\u5e03\u5f0f\u534f\u540c\u5de5\u4f5c<\/strong><\/p>\n<h3 id=\"heading5\" data-id-_23c36e241921=\"1\">\u573a\u666f\u4e94\uff1a\u5206\u5e03\u5f0f\u9501<\/h3>\n<p>\u56e0\u4e3a etcd \u4f7f\u7528 Raft \u7b97\u6cd5\u4fdd\u6301\u4e86\u6570\u636e\u7684\u5f3a\u4e00\u81f4\u6027\uff0c\u67d0\u6b21\u64cd\u4f5c\u5b58\u50a8\u5230\u96c6\u7fa4\u4e2d\u7684\u503c\u5fc5\u7136\u662f\u5168\u5c40\u4e00\u81f4\u7684\uff0c\u6240\u4ee5\u5f88\u5bb9\u6613\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u3002\u9501\u670d\u52a1\u6709\u4e24\u79cd\u4f7f\u7528\u65b9\u5f0f\uff0c\u4e00\u662f\u4fdd\u6301\u72ec\u5360\uff0c\u4e8c\u662f\u63a7\u5236\u65f6\u5e8f\u3002<\/p>\n<ul>\n<li><strong>\u4fdd\u6301\u72ec\u5360\u5373\u6240\u6709\u83b7\u53d6\u9501\u7684\u7528\u6237\u6700\u7ec8\u53ea\u6709\u4e00\u4e2a\u53ef\u4ee5\u5f97\u5230<\/strong>\u3002etcd \u4e3a\u6b64\u63d0\u4f9b\u4e86\u4e00\u5957\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u539f\u5b50\u64cd\u4f5c CAS\uff08<code>CompareAndSwap<\/code>\uff09\u7684 API\u3002\u901a\u8fc7\u8bbe\u7f6e<code>prevExist<\/code>\u503c\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u5728\u591a\u4e2a\u8282\u70b9\u540c\u65f6\u53bb\u521b\u5efa\u67d0\u4e2a\u76ee\u5f55\u65f6\uff0c\u53ea\u6709\u4e00\u4e2a\u6210\u529f\u3002\u800c\u521b\u5efa\u6210\u529f\u7684\u7528\u6237\u5c31\u53ef\u4ee5\u8ba4\u4e3a\u662f\u83b7\u5f97\u4e86\u9501\u3002<\/li>\n<li>\u63a7\u5236\u65f6\u5e8f\uff0c\u5373\u6240\u6709\u60f3\u8981\u83b7\u5f97\u9501\u7684\u7528\u6237\u90fd\u4f1a\u88ab\u5b89\u6392\u6267\u884c\uff0c\u4f46\u662f<strong>\u83b7\u5f97\u9501\u7684\u987a\u5e8f\u4e5f\u662f\u5168\u5c40\u552f\u4e00\u7684\uff0c\u540c\u65f6\u51b3\u5b9a\u4e86\u6267\u884c\u987a\u5e8f<\/strong>\u3002etcd \u4e3a\u6b64\u4e5f\u63d0\u4f9b\u4e86\u4e00\u5957 API\uff08\u81ea\u52a8\u521b\u5efa\u6709\u5e8f\u952e\uff09\uff0c\u5bf9\u4e00\u4e2a\u76ee\u5f55\u5efa\u503c\u65f6\u6307\u5b9a\u4e3a<code>POST<\/code>\u52a8\u4f5c\uff0c\u8fd9\u6837 etcd \u4f1a\u81ea\u52a8\u5728\u76ee\u5f55\u4e0b\u751f\u6210\u4e00\u4e2a\u5f53\u524d\u6700\u5927\u7684\u503c\u4e3a\u952e\uff0c\u5b58\u50a8\u8fd9\u4e2a\u65b0\u7684\u503c\uff08\u5ba2\u6237\u7aef\u7f16\u53f7\uff09\u3002\u540c\u65f6\u8fd8\u53ef\u4ee5\u4f7f\u7528 API \u6309\u987a\u5e8f\u5217\u51fa\u6240\u6709\u5f53\u524d\u76ee\u5f55\u4e0b\u7684\u952e\u503c\u3002\u6b64\u65f6\u8fd9\u4e9b\u952e\u7684\u503c\u5c31\u662f\u5ba2\u6237\u7aef\u7684\u65f6\u5e8f\uff0c\u800c\u8fd9\u4e9b\u952e\u4e2d\u5b58\u50a8\u7684\u503c\u53ef\u4ee5\u662f\u4ee3\u8868\u5ba2\u6237\u7aef\u7684\u7f16\u53f7\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/46\/dc\/46ff86e2e2c2157bc3f0409845f0e1dc.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 7 \u5206\u5e03\u5f0f\u9501<\/strong><\/p>\n<h3 id=\"heading6\" data-id-_615549e235dc=\"1\">\u573a\u666f\u516d\uff1a\u5206\u5e03\u5f0f\u961f\u5217<\/h3>\n<p>\u5206\u5e03\u5f0f\u961f\u5217\u7684\u5e38\u89c4\u7528\u6cd5\u4e0e\u573a\u666f\u4e94\u4e2d\u6240\u63cf\u8ff0\u7684\u5206\u5e03\u5f0f\u9501\u7684\u63a7\u5236\u65f6\u5e8f\u7528\u6cd5\u7c7b\u4f3c\uff0c\u5373\u521b\u5efa\u4e00\u4e2a\u5148\u8fdb\u5148\u51fa\u7684\u961f\u5217\uff0c\u4fdd\u8bc1\u987a\u5e8f\u3002<\/p>\n<p>\u53e6\u4e00\u79cd\u6bd4\u8f83\u6709\u610f\u601d\u7684\u5b9e\u73b0\u662f<strong>\u5728\u4fdd\u8bc1\u961f\u5217\u8fbe\u5230\u67d0\u4e2a\u6761\u4ef6\u65f6\u518d\u7edf\u4e00\u6309\u987a\u5e8f\u6267\u884c<\/strong>\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u5b9e\u73b0\u53ef\u4ee5\u5728 \/queue \u8fd9\u4e2a\u76ee\u5f55\u4e2d\u53e6\u5916\u5efa\u7acb\u4e00\u4e2a \/queue\/condition \u8282\u70b9\u3002<\/p>\n<ul>\n<li>condition \u53ef\u4ee5<strong>\u8868\u793a\u961f\u5217\u5927\u5c0f<\/strong>\u3002\u6bd4\u5982\u4e00\u4e2a\u5927\u7684\u4efb\u52a1\u9700\u8981\u5f88\u591a\u5c0f\u4efb\u52a1\u5c31\u7eea\u7684\u60c5\u51b5\u4e0b\u624d\u80fd\u6267\u884c\uff0c\u6bcf\u6b21\u6709\u4e00\u4e2a\u5c0f\u4efb\u52a1\u5c31\u7eea\uff0c\u5c31\u7ed9\u8fd9\u4e2a condition \u6570\u5b57\u52a0 1\uff0c\u76f4\u5230\u8fbe\u5230\u5927\u4efb\u52a1\u89c4\u5b9a\u7684\u6570\u5b57\uff0c\u518d\u5f00\u59cb\u6267\u884c\u961f\u5217\u91cc\u7684\u4e00\u7cfb\u5217\u5c0f\u4efb\u52a1\uff0c\u6700\u7ec8\u6267\u884c\u5927\u4efb\u52a1\u3002<\/li>\n<li>condition \u53ef\u4ee5<strong>\u8868\u793a\u67d0\u4e2a\u4efb\u52a1\u5728\u4e0d\u5728\u961f\u5217<\/strong>\u3002\u8fd9\u4e2a\u4efb\u52a1\u53ef\u4ee5\u662f\u6240\u6709\u6392\u5e8f\u4efb\u52a1\u7684\u9996\u4e2a\u6267\u884c\u7a0b\u5e8f\uff0c\u4e5f\u53ef\u4ee5\u662f\u62d3\u6251\u7ed3\u6784\u4e2d\u6ca1\u6709\u4f9d\u8d56\u7684\u70b9\u3002\u901a\u5e38\uff0c\u5fc5\u987b\u6267\u884c\u8fd9\u4e9b\u4efb\u52a1\u540e\u624d\u80fd\u6267\u884c\u961f\u5217\u4e2d\u7684\u5176\u4ed6\u4efb\u52a1\u3002<\/li>\n<li>condition \u8fd8\u53ef\u4ee5<strong>\u8868\u793a\u5176\u5b83\u7684\u4e00\u7c7b\u5f00\u59cb\u6267\u884c\u4efb\u52a1\u7684\u901a\u77e5<\/strong>\u3002\u53ef\u4ee5\u7531\u63a7\u5236\u7a0b\u5e8f\u6307\u5b9a\uff0c\u5f53 condition \u51fa\u73b0\u53d8\u5316\u65f6\uff0c\u5f00\u59cb\u6267\u884c\u961f\u5217\u4efb\u52a1\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/a0\/73\/a08ce82fb3bee55d0e31d6e2d062a273.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 8 \u5206\u5e03\u5f0f\u961f\u5217<\/strong><\/p>\n<h3 id=\"heading7\" data-id-_f0bc9377eeb1=\"1\">\u573a\u666f\u4e03\uff1a\u96c6\u7fa4\u76d1\u63a7\u4e0e Leader \u7ade\u9009<\/h3>\n<p>\u901a\u8fc7 etcd \u6765\u8fdb\u884c\u76d1\u63a7\u5b9e\u73b0\u8d77\u6765\u975e\u5e38\u7b80\u5355\u5e76\u4e14\u5b9e\u65f6\u6027\u5f3a\u3002<\/p>\n<ol>\n<li>\u524d\u9762\u51e0\u4e2a\u573a\u666f\u5df2\u7ecf\u63d0\u5230 Watcher \u673a\u5236\uff0c\u5f53\u67d0\u4e2a\u8282\u70b9\u6d88\u5931\u6216\u6709\u53d8\u52a8\u65f6\uff0cWatcher \u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u73b0\u5e76\u544a\u77e5\u7528\u6237\u3002<\/li>\n<li>\u8282\u70b9\u53ef\u4ee5\u8bbe\u7f6e<code>TTL key<\/code>\uff0c\u6bd4\u5982\u6bcf\u9694 30s \u53d1\u9001\u4e00\u6b21\u5fc3\u8df3\u4f7f\u4ee3\u8868\u8be5\u673a\u5668\u5b58\u6d3b\u7684\u8282\u70b9\u7ee7\u7eed\u5b58\u5728\uff0c\u5426\u5219\u8282\u70b9\u6d88\u5931\u3002<\/li>\n<\/ol>\n<p>\u8fd9\u6837\u5c31\u53ef\u4ee5\u7b2c\u4e00\u65f6\u95f4\u68c0\u6d4b\u5230\u5404\u8282\u70b9\u7684\u5065\u5eb7\u72b6\u6001\uff0c\u4ee5\u5b8c\u6210\u96c6\u7fa4\u7684\u76d1\u63a7\u8981\u6c42\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u4f7f\u7528\u5206\u5e03\u5f0f\u9501\uff0c\u53ef\u4ee5\u5b8c\u6210 Leader \u7ade\u9009\u3002\u8fd9\u79cd\u573a\u666f\u901a\u5e38\u662f\u4e00\u4e9b\u957f\u65f6\u95f4 CPU \u8ba1\u7b97\u6216\u8005\u4f7f\u7528 IO \u64cd\u4f5c\u7684\u673a\u5668\uff0c\u53ea\u9700\u8981\u7ade\u9009\u51fa\u7684 Leader \u8ba1\u7b97\u6216\u5904\u7406\u4e00\u6b21\uff0c\u5c31\u53ef\u4ee5\u628a\u7ed3\u679c\u590d\u5236\u7ed9\u5176\u4ed6\u7684 Follower\u3002\u4ece\u800c\u907f\u514d\u91cd\u590d\u52b3\u52a8\uff0c\u8282\u7701\u8ba1\u7b97\u8d44\u6e90\u3002<\/p>\n<p>\u8fd9\u4e2a\u7684\u7ecf\u5178\u573a\u666f\u662f<strong>\u641c\u7d22\u7cfb\u7edf\u4e2d\u5efa\u7acb\u5168\u91cf\u7d22\u5f15<\/strong>\u3002\u5982\u679c\u6bcf\u4e2a\u673a\u5668\u90fd\u8fdb\u884c\u4e00\u904d\u7d22\u5f15\u7684\u5efa\u7acb\uff0c\u4e0d\u4f46\u8017\u65f6\u800c\u4e14\u5efa\u7acb\u7d22\u5f15\u7684\u4e00\u81f4\u6027\u4e0d\u80fd\u4fdd\u8bc1\u3002\u901a\u8fc7\u5728 etcd \u7684 CAS \u673a\u5236\u540c\u65f6\u521b\u5efa\u4e00\u4e2a\u8282\u70b9\uff0c\u521b\u5efa\u6210\u529f\u7684\u673a\u5668\u4f5c\u4e3a Leader\uff0c\u8fdb\u884c\u7d22\u5f15\u8ba1\u7b97\uff0c\u7136\u540e\u628a\u8ba1\u7b97\u7ed3\u679c\u5206\u53d1\u5230\u5176\u5b83\u8282\u70b9\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/2d\/8c\/2dc062ceed9f882ab99ff41f1ca7b18c.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 9 Leader \u7ade\u9009<\/strong><\/p>\n<h3 id=\"heading8\" data-id-_767c90308094=\"1\">\u573a\u666f\u516b\uff1a\u4e3a\u4ec0\u4e48\u7528 etcd \u800c\u4e0d\u7528 ZooKeeper\uff1f<\/h3>\n<p>\u9605\u8bfb\u4e86<a href=\"http:\/\/jm-blog.aliapp.com\/?p=1232\" target=\"_blank\" rel=\"noopener nofollow\">\u201cZooKeeper \u5178\u578b\u5e94\u7528\u573a\u666f\u4e00\u89c8\u201d<\/a>\u4e00\u6587\u7684\u8bfb\u8005\u53ef\u80fd\u4f1a\u53d1\u73b0\uff0cetcd \u5b9e\u73b0\u7684\u8fd9\u4e9b\u529f\u80fd\uff0cZooKeeper \u90fd\u80fd\u5b9e\u73b0\u3002\u90a3\u4e48\u4e3a\u4ec0\u4e48\u8981\u7528 etcd \u800c\u975e\u76f4\u63a5\u4f7f\u7528 ZooKeeper \u5462\uff1f<\/p>\n<p>\u76f8\u8f83\u4e4b\u4e0b\uff0cZooKeeper \u6709\u5982\u4e0b\u7f3a\u70b9\uff1a<\/p>\n<ol>\n<li>\u590d\u6742\u3002ZooKeeper \u7684<strong>\u90e8\u7f72\u7ef4\u62a4\u590d\u6742<\/strong>\uff0c\u7ba1\u7406\u5458\u9700\u8981\u638c\u63e1\u4e00\u7cfb\u5217\u7684\u77e5\u8bc6\u548c\u6280\u80fd\uff1b\u800c Paxos \u5f3a\u4e00\u81f4\u6027<strong>\u7b97\u6cd5<\/strong>\u4e5f\u662f\u7d20\u6765\u4ee5<strong>\u590d\u6742<\/strong>\u96be\u61c2\u800c\u95fb\u540d\u4e8e\u4e16\uff1b\u53e6\u5916\uff0cZooKeeper \u7684\u4f7f\u7528\u4e5f\u6bd4\u8f83\u590d\u6742\uff0c\u9700\u8981\u5b89\u88c5\u5ba2\u6237\u7aef\uff0c\u5b98\u65b9\u53ea\u63d0\u4f9b\u4e86 Java \u548c C \u4e24\u79cd\u8bed\u8a00\u7684\u63a5\u53e3\u3002<\/li>\n<li>Java \u7f16\u5199\u3002\u8fd9\u91cc\u4e0d\u662f\u5bf9 Java \u6709\u504f\u89c1\uff0c\u800c\u662f Java \u672c\u8eab\u5c31\u504f\u5411\u4e8e<strong>\u91cd\u578b\u5e94\u7528<\/strong>\uff0c\u5b83\u4f1a\u5f15\u5165\u5927\u91cf\u7684\u4f9d\u8d56\u3002\u800c\u8fd0\u7ef4\u4eba\u5458\u5219\u666e\u904d\u5e0c\u671b\u4fdd\u6301\u5f3a\u4e00\u81f4\u3001\u9ad8\u53ef\u7528\u7684\u673a\u5668\u96c6\u7fa4\u5c3d\u53ef\u80fd\u7b80\u5355\uff0c\u7ef4\u62a4\u8d77\u6765\u4e5f\u4e0d\u6613\u51fa\u9519\u3002<\/li>\n<li><strong>\u53d1\u5c55\u7f13\u6162<\/strong>\u3002Apache \u57fa\u91d1\u4f1a\u9879\u76ee\u7279\u6709\u7684<a href=\"http:\/\/www.infoworld.com\/article\/2612082\/open-source-software\/has-apache-lost-its-way-.html\" target=\"_blank\" rel=\"noopener nofollow\">\u201cApache Way\u201d<\/a>\u5728\u5f00\u6e90\u754c\u9971\u53d7\u4e89\u8bae\uff0c\u5176\u4e2d\u4e00\u5927\u539f\u56e0\u5c31\u662f\u7531\u4e8e\u57fa\u91d1\u4f1a\u5e9e\u5927\u7684\u7ed3\u6784\u4ee5\u53ca\u677e\u6563\u7684\u7ba1\u7406\u5bfc\u81f4\u9879\u76ee\u53d1\u5c55\u7f13\u6162\u3002<\/li>\n<\/ol>\n<p>\u800c etcd \u4f5c\u4e3a\u4e00\u4e2a\u540e\u8d77\u4e4b\u79c0\uff0c\u5176\u4f18\u70b9\u4e5f\u5f88\u660e\u663e\u3002<\/p>\n<ol>\n<li>\u7b80\u5355\u3002\u4f7f\u7528 Go \u8bed\u8a00\u7f16\u5199<strong>\u90e8\u7f72\u7b80\u5355<\/strong>\uff1b\u4f7f\u7528 HTTP \u4f5c\u4e3a\u63a5\u53e3<strong>\u4f7f\u7528\u7b80\u5355<\/strong>\uff1b\u4f7f\u7528 Raft \u7b97\u6cd5\u4fdd\u8bc1\u5f3a\u4e00\u81f4\u6027\u8ba9\u7528\u6237<strong>\u6613\u4e8e\u7406\u89e3<\/strong>\u3002<\/li>\n<li><strong>\u6570\u636e\u6301\u4e45\u5316<\/strong>\u3002etcd \u9ed8\u8ba4\u6570\u636e\u4e00\u66f4\u65b0\u5c31\u8fdb\u884c\u6301\u4e45\u5316\u3002<\/li>\n<li><strong>\u5b89\u5168<\/strong>\u3002etcd \u652f\u6301 SSL \u5ba2\u6237\u7aef\u5b89\u5168\u8ba4\u8bc1\u3002<\/li>\n<\/ol>\n<p>\u6700\u540e\uff0cetcd \u4f5c\u4e3a\u4e00\u4e2a\u5e74\u8f7b\u7684\u9879\u76ee\uff0c\u771f\u6b63\u544a\u8bc9\u8fed\u4ee3\u548c\u5f00\u53d1\u4e2d\uff0c\u8fd9\u65e2\u662f\u4e00\u4e2a\u4f18\u70b9\uff0c\u4e5f\u662f\u4e00\u4e2a\u7f3a\u70b9\u3002\u4f18\u70b9\u662f\u5b83\u7684\u672a\u6765\u5177\u6709\u65e0\u9650\u7684\u53ef\u80fd\u6027\uff0c\u7f3a\u70b9\u662f\u65e0\u6cd5\u5f97\u5230\u5927\u9879\u76ee\u957f\u65f6\u95f4\u4f7f\u7528\u7684\u68c0\u9a8c\u3002\u7136\u800c\uff0c\u76ee\u524d CoreOS\u3001Kubernetes \u548c CloudFoundry \u7b49\u77e5\u540d\u9879\u76ee\u5747\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u4f7f\u7528\u4e86 etcd\uff0c\u6240\u4ee5\u603b\u7684\u6765\u8bf4\uff0cetcd \u503c\u5f97\u4f60\u53bb\u5c1d\u8bd5\u3002<\/p>\n<h2 id=\"heading9\" data-id-_5d1306fb3bbb=\"1\">etcd \u5b9e\u73b0\u539f\u7406\u89e3\u8bfb<\/h2>\n<p>\u4e0a\u4e00\u8282\u4e2d\uff0c\u6211\u4eec\u6982\u62ec\u4e86\u8bb8\u591a etcd \u7684\u7ecf\u5178\u573a\u666f\uff0c\u8fd9\u4e00\u8282\uff0c\u6211\u4eec\u5c06\u4ece etcd \u7684\u67b6\u6784\u5f00\u59cb\uff0c\u6df1\u5165\u5230\u6e90\u7801\u4e2d\u89e3\u6790 etcd\u3002<\/p>\n<h3 id=\"heading10\" data-id-_2615bbb9808d=\"1\">1 \u67b6\u6784<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/cf\/94\/cf0851c4bcbd2555d09674e7e2a07394.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 10 etcd \u67b6\u6784\u56fe<\/strong><\/p>\n<p>\u4ece etcd \u7684\u67b6\u6784\u56fe\u4e2d\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cetcd \u4e3b\u8981\u5206\u4e3a\u56db\u4e2a\u90e8\u5206\u3002<\/p>\n<ul>\n<li>HTTP Server\uff1a \u7528\u4e8e\u5904\u7406\u7528\u6237\u53d1\u9001\u7684 API \u8bf7\u6c42\u4ee5\u53ca\u5176\u5b83 etcd \u8282\u70b9\u7684\u540c\u6b65\u4e0e\u5fc3\u8df3\u4fe1\u606f\u8bf7\u6c42\u3002<\/li>\n<li>Store\uff1a\u7528\u4e8e\u5904\u7406 etcd \u652f\u6301\u7684\u5404\u7c7b\u529f\u80fd\u7684\u4e8b\u52a1\uff0c\u5305\u62ec\u6570\u636e\u7d22\u5f15\u3001\u8282\u70b9\u72b6\u6001\u53d8\u66f4\u3001\u76d1\u63a7\u4e0e\u53cd\u9988\u3001\u4e8b\u4ef6\u5904\u7406\u4e0e\u6267\u884c\u7b49\u7b49\uff0c\u662f etcd \u5bf9\u7528\u6237\u63d0\u4f9b\u7684\u5927\u591a\u6570 API \u529f\u80fd\u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/li>\n<li>Raft\uff1aRaft \u5f3a\u4e00\u81f4\u6027\u7b97\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u662f etcd \u7684\u6838\u5fc3\u3002<\/li>\n<li>WAL\uff1aWrite Ahead Log\uff08\u9884\u5199\u5f0f\u65e5\u5fd7\uff09\uff0c\u662f etcd \u7684\u6570\u636e\u5b58\u50a8\u65b9\u5f0f\u3002\u9664\u4e86\u5728\u5185\u5b58\u4e2d\u5b58\u6709\u6240\u6709\u6570\u636e\u7684\u72b6\u6001\u4ee5\u53ca\u8282\u70b9\u7684\u7d22\u5f15\u4ee5\u5916\uff0cetcd \u5c31\u901a\u8fc7 WAL \u8fdb\u884c\u6301\u4e45\u5316\u5b58\u50a8\u3002WAL \u4e2d\uff0c\u6240\u6709\u7684\u6570\u636e\u63d0\u4ea4\u524d\u90fd\u4f1a\u4e8b\u5148\u8bb0\u5f55\u65e5\u5fd7\u3002Snapshot \u662f\u4e3a\u4e86\u9632\u6b62\u6570\u636e\u8fc7\u591a\u800c\u8fdb\u884c\u7684\u72b6\u6001\u5feb\u7167\uff1bEntry \u8868\u793a\u5b58\u50a8\u7684\u5177\u4f53\u65e5\u5fd7\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<p>\u901a\u5e38\uff0c\u4e00\u4e2a\u7528\u6237\u7684\u8bf7\u6c42\u53d1\u9001\u8fc7\u6765\uff0c\u4f1a\u7ecf\u7531 HTTP Server \u8f6c\u53d1\u7ed9 Store \u8fdb\u884c\u5177\u4f53\u7684\u4e8b\u52a1\u5904\u7406\uff0c\u5982\u679c\u6d89\u53ca\u5230\u8282\u70b9\u7684\u4fee\u6539\uff0c\u5219\u4ea4\u7ed9 Raft \u6a21\u5757\u8fdb\u884c\u72b6\u6001\u7684\u53d8\u66f4\u3001\u65e5\u5fd7\u7684\u8bb0\u5f55\uff0c\u7136\u540e\u518d\u540c\u6b65\u7ed9\u522b\u7684 etcd \u8282\u70b9\u4ee5\u786e\u8ba4\u6570\u636e\u63d0\u4ea4\uff0c\u6700\u540e\u8fdb\u884c\u6570\u636e\u7684\u63d0\u4ea4\uff0c\u518d\u6b21\u540c\u6b65\u3002<\/p>\n<h3 id=\"heading11\" data-id-_c294b42305e9=\"1\">2 \u65b0\u7248 etcd \u91cd\u8981\u53d8\u66f4\u5217\u8868<\/h3>\n<ul>\n<li>\u83b7\u5f97\u4e86 IANA \u8ba4\u8bc1\u7684\u7aef\u53e3\uff0c2379 \u7528\u4e8e\u5ba2\u6237\u7aef\u901a\u4fe1\uff0c2380 \u7528\u4e8e\u8282\u70b9\u901a\u4fe1\uff0c\u4e0e\u539f\u5148\u7684\uff084001 peers \/ 7001 clients\uff09\u5171\u7528\u3002<\/li>\n<li>\u6bcf\u4e2a\u8282\u70b9\u53ef\u76d1\u542c\u591a\u4e2a\u5e7f\u64ad\u5730\u5740\u3002\u76d1\u542c\u7684\u5730\u5740\u7531\u539f\u6765\u7684\u4e00\u4e2a\u6269\u5c55\u5230\u591a\u4e2a\uff0c\u7528\u6237\u53ef\u4ee5\u6839\u636e\u9700\u6c42\u5b9e\u73b0\u66f4\u52a0\u590d\u6742\u7684\u96c6\u7fa4\u73af\u5883\uff0c\u5982\u4e00\u4e2a\u662f\u516c\u7f51 IP\uff0c\u4e00\u4e2a\u662f\u865a\u62df\u673a\uff08\u5bb9\u5668\uff09\u4e4b\u7c7b\u7684\u79c1\u6709 IP\u3002<\/li>\n<li>etcd \u53ef\u4ee5\u4ee3\u7406\u8bbf\u95ee leader \u8282\u70b9\u7684\u8bf7\u6c42\uff0c\u6240\u4ee5\u5982\u679c\u4f60\u53ef\u4ee5\u8bbf\u95ee\u4efb\u4f55\u4e00\u4e2a etcd \u8282\u70b9\uff0c\u90a3\u4e48\u4f60\u5c31\u53ef\u4ee5\u65e0\u89c6\u7f51\u7edc\u7684\u62d3\u6251\u7ed3\u6784\u5bf9\u6574\u4e2a\u96c6\u7fa4\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u3002<\/li>\n<li>etcd \u96c6\u7fa4\u548c\u96c6\u7fa4\u4e2d\u7684\u8282\u70b9\u90fd\u6709\u4e86\u81ea\u5df1\u72ec\u7279\u7684 ID\u3002\u8fd9\u6837\u5c31\u9632\u6b62\u51fa\u73b0\u914d\u7f6e\u6df7\u6dc6\uff0c\u4e0d\u662f\u672c\u96c6\u7fa4\u7684\u5176\u4ed6 etcd \u8282\u70b9\u53d1\u6765\u7684\u8bf7\u6c42\u5c06\u88ab\u5c4f\u853d\u3002<\/li>\n<li>etcd \u96c6\u7fa4\u542f\u52a8\u65f6\u7684\u914d\u7f6e\u4fe1\u606f\u76ee\u524d\u53d8\u4e3a\u5b8c\u5168\u56fa\u5b9a\uff0c\u8fd9\u6837\u6709\u52a9\u4e8e\u7528\u6237\u6b63\u786e\u914d\u7f6e\u548c\u542f\u52a8\u3002<\/li>\n<li>\u8fd0\u884c\u65f6\u8282\u70b9\u53d8\u5316 (Runtime Reconfiguration)\u3002\u7528\u6237\u4e0d\u9700\u8981\u91cd\u542f etcd \u670d\u52a1\u5373\u53ef\u5b9e\u73b0\u5bf9 etcd \u96c6\u7fa4\u7ed3\u6784\u8fdb\u884c\u53d8\u66f4\u3002\u542f\u52a8\u540e\u53ef\u4ee5\u52a8\u6001\u53d8\u66f4\u96c6\u7fa4\u914d\u7f6e\u3002<\/li>\n<li>\u91cd\u65b0\u8bbe\u8ba1\u548c\u5b9e\u73b0\u4e86 Raft \u7b97\u6cd5\uff0c\u4f7f\u5f97\u8fd0\u884c\u901f\u5ea6\u66f4\u5feb\uff0c\u66f4\u5bb9\u6613\u7406\u89e3\uff0c\u5305\u542b\u66f4\u591a\u6d4b\u8bd5\u4ee3\u7801\u3002<\/li>\n<li>Raft \u65e5\u5fd7\u73b0\u5728\u662f\u4e25\u683c\u7684\u53ea\u80fd\u5411\u540e\u8ffd\u52a0\u3001\u9884\u5199\u5f0f\u65e5\u5fd7\u7cfb\u7edf\uff0c\u5e76\u4e14\u5728\u6bcf\u6761\u8bb0\u5f55\u4e2d\u90fd\u52a0\u5165\u4e86 CRC \u6821\u9a8c\u7801\u3002<\/li>\n<li>\u542f\u52a8\u65f6\u4f7f\u7528\u7684 _etcd\/* \u5173\u952e\u5b57\u4e0d\u518d\u66b4\u9732\u7ed9\u7528\u6237<\/li>\n<li>\u5e9f\u5f03\u96c6\u7fa4\u81ea\u52a8\u8c03\u6574\u529f\u80fd\u7684 standby \u6a21\u5f0f\uff0c\u8fd9\u4e2a\u529f\u80fd\u4f7f\u5f97\u7528\u6237\u7ef4\u62a4\u96c6\u7fa4\u66f4\u56f0\u96be\u3002<\/li>\n<li>\u65b0\u589e Proxy \u6a21\u5f0f\uff0c\u4e0d\u52a0\u5165\u5230 etcd \u4e00\u81f4\u6027\u96c6\u7fa4\u4e2d\uff0c\u7eaf\u7cb9\u8fdb\u884c\u4ee3\u7406\u8f6c\u53d1\u3002<\/li>\n<li>ETCD_NAME\uff08-name\uff09\u53c2\u6570\u76ee\u524d\u662f\u53ef\u9009\u7684\uff0c\u4e0d\u518d\u7528\u4e8e\u552f\u4e00\u6807\u8bc6\u4e00\u4e2a\u8282\u70b9\u3002<\/li>\n<li>\u6452\u5f03\u901a\u8fc7\u914d\u7f6e\u6587\u4ef6\u914d\u7f6e etcd \u5c5e\u6027\u7684\u65b9\u5f0f\uff0c\u4f60\u53ef\u4ee5\u7528\u73af\u5883\u53d8\u91cf\u7684\u65b9\u5f0f\u4ee3\u66ff\u3002<\/li>\n<li>\u901a\u8fc7\u81ea\u53d1\u73b0\u65b9\u5f0f\u542f\u52a8\u96c6\u7fa4\u5fc5\u987b\u8981\u63d0\u4f9b\u96c6\u7fa4\u5927\u5c0f\uff0c\u8fd9\u6837\u6709\u52a9\u4e8e\u7528\u6237\u786e\u5b9a\u96c6\u7fa4\u5b9e\u9645\u542f\u52a8\u7684\u8282\u70b9\u6570\u91cf\u3002<\/li>\n<\/ul>\n<h3 id=\"heading12\" data-id-_761857faabe0=\"1\">3 etcd \u6982\u5ff5\u8bcd\u6c47\u8868<\/h3>\n<ul>\n<li>Raft\uff1aetcd \u6240\u91c7\u7528\u7684\u4fdd\u8bc1\u5206\u5e03\u5f0f\u7cfb\u7edf\u5f3a\u4e00\u81f4\u6027\u7684\u7b97\u6cd5\u3002<\/li>\n<li>Node\uff1a\u4e00\u4e2a Raft \u72b6\u6001\u673a\u5b9e\u4f8b\u3002<\/li>\n<li>Member\uff1a \u4e00\u4e2a etcd \u5b9e\u4f8b\u3002\u5b83\u7ba1\u7406\u7740\u4e00\u4e2a Node\uff0c\u5e76\u4e14\u53ef\u4ee5\u4e3a\u5ba2\u6237\u7aef\u8bf7\u6c42\u63d0\u4f9b\u670d\u52a1\u3002<\/li>\n<li>Cluster\uff1a\u7531\u591a\u4e2a Member \u6784\u6210\u53ef\u4ee5\u534f\u540c\u5de5\u4f5c\u7684 etcd \u96c6\u7fa4\u3002<\/li>\n<li>Peer\uff1a\u5bf9\u540c\u4e00\u4e2a etcd \u96c6\u7fa4\u4e2d\u53e6\u5916\u4e00\u4e2a Member \u7684\u79f0\u547c\u3002<\/li>\n<li>Client\uff1a \u5411 etcd \u96c6\u7fa4\u53d1\u9001 HTTP \u8bf7\u6c42\u7684\u5ba2\u6237\u7aef\u3002<\/li>\n<li>WAL\uff1a\u9884\u5199\u5f0f\u65e5\u5fd7\uff0cetcd \u7528\u4e8e\u6301\u4e45\u5316\u5b58\u50a8\u7684\u65e5\u5fd7\u683c\u5f0f\u3002<\/li>\n<li>snapshot\uff1aetcd \u9632\u6b62 WAL \u6587\u4ef6\u8fc7\u591a\u800c\u8bbe\u7f6e\u7684\u5feb\u7167\uff0c\u5b58\u50a8 etcd \u6570\u636e\u72b6\u6001\u3002<\/li>\n<li>Proxy\uff1aetcd \u7684\u4e00\u79cd\u6a21\u5f0f\uff0c\u4e3a etcd \u96c6\u7fa4\u63d0\u4f9b\u53cd\u5411\u4ee3\u7406\u670d\u52a1\u3002<\/li>\n<li>Leader\uff1aRaft \u7b97\u6cd5\u4e2d\u901a\u8fc7\u7ade\u9009\u800c\u4ea7\u751f\u7684\u5904\u7406\u6240\u6709\u6570\u636e\u63d0\u4ea4\u7684\u8282\u70b9\u3002<\/li>\n<li>Follower\uff1a\u7ade\u9009\u5931\u8d25\u7684\u8282\u70b9\u4f5c\u4e3a Raft \u4e2d\u7684\u4ece\u5c5e\u8282\u70b9\uff0c\u4e3a\u7b97\u6cd5\u63d0\u4f9b\u5f3a\u4e00\u81f4\u6027\u4fdd\u8bc1\u3002<\/li>\n<li>Candidate\uff1a\u5f53 Follower \u8d85\u8fc7\u4e00\u5b9a\u65f6\u95f4\u63a5\u6536\u4e0d\u5230 Leader \u7684\u5fc3\u8df3\u65f6\u8f6c\u53d8\u4e3a Candidate \u5f00\u59cb\u7ade\u9009\u3002<\/li>\n<li>Term\uff1a\u67d0\u4e2a\u8282\u70b9\u6210\u4e3a Leader \u5230\u4e0b\u4e00\u6b21\u7ade\u9009\u65f6\u95f4\uff0c\u79f0\u4e3a\u4e00\u4e2a Term\u3002<\/li>\n<li>Index\uff1a\u6570\u636e\u9879\u7f16\u53f7\u3002Raft \u4e2d\u901a\u8fc7 Term \u548c Index \u6765\u5b9a\u4f4d\u6570\u636e\u3002<\/li>\n<\/ul>\n<h3 id=\"heading13\" data-id-_14dc45899db8=\"1\">4 \u96c6\u7fa4\u5316\u5e94\u7528\u5b9e\u8df5<\/h3>\n<p>etcd \u4f5c\u4e3a\u4e00\u4e2a\u9ad8\u53ef\u7528\u952e\u503c\u5b58\u50a8\u7cfb\u7edf\uff0c\u5929\u751f\u5c31\u662f\u4e3a\u96c6\u7fa4\u5316\u800c\u8bbe\u8ba1\u7684\u3002\u7531\u4e8e Raft \u7b97\u6cd5\u5728\u505a\u51b3\u7b56\u65f6\u9700\u8981\u591a\u6570\u8282\u70b9\u7684\u6295\u7968\uff0c\u6240\u4ee5 etcd \u4e00\u822c\u90e8\u7f72\u96c6\u7fa4\u63a8\u8350\u5947\u6570\u4e2a\u8282\u70b9\uff0c\u63a8\u8350\u7684\u6570\u91cf\u4e3a 3\u30015 \u6216\u8005 7 \u4e2a\u8282\u70b9\u6784\u6210\u4e00\u4e2a\u96c6\u7fa4\u3002<\/p>\n<h4 id=\"heading14\" data-id-_0ce63f6e77c9=\"1\">4.1 \u96c6\u7fa4\u542f\u52a8<\/h4>\n<p>etcd \u6709\u4e09\u79cd\u96c6\u7fa4\u5316\u542f\u52a8\u7684\u914d\u7f6e\u65b9\u6848\uff0c\u5206\u522b\u4e3a\u9759\u6001\u914d\u7f6e\u542f\u52a8\u3001etcd \u81ea\u8eab\u670d\u52a1\u53d1\u73b0\u3001\u901a\u8fc7 DNS \u8fdb\u884c\u670d\u52a1\u53d1\u73b0\u3002<\/p>\n<p><strong>\u901a\u8fc7\u914d\u7f6e\u5185\u5bb9\u7684\u4e0d\u540c\uff0c\u4f60\u53ef\u4ee5\u5bf9\u4e0d\u540c\u7684\u65b9\u5f0f\u8fdb\u884c\u9009\u62e9\u3002\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff0c\u8fd9\u4e5f\u662f\u65b0\u7248 etcd \u533a\u522b\u4e8e\u65e7\u7248\u7684\u4e00\u5927\u7279\u6027\uff0c\u5b83\u6452\u5f03\u4e86\u4f7f\u7528\u914d\u7f6e\u6587\u4ef6\u8fdb\u884c\u53c2\u6570\u914d\u7f6e\u7684\u505a\u6cd5\uff0c\u8f6c\u800c\u4f7f\u7528\u547d\u4ee4\u884c\u53c2\u6570\u6216\u8005\u73af\u5883\u53d8\u91cf\u7684\u505a\u6cd5\u6765\u914d\u7f6e\u53c2\u6570\u3002<\/strong><\/p>\n<h5 id=\"heading15\" data-id-_9311cd37d914=\"1\">4.1.1. \u9759\u6001\u914d\u7f6e<\/h5>\n<p>\u8fd9\u79cd\u65b9\u5f0f\u6bd4\u8f83\u9002\u7528\u4e8e\u79bb\u7ebf\u73af\u5883\uff0c\u5728\u542f\u52a8\u6574\u4e2a\u96c6\u7fa4\u4e4b\u524d\uff0c\u4f60\u5c31\u5df2\u7ecf\u9884\u5148\u6e05\u695a\u6240\u8981\u914d\u7f6e\u7684\u96c6\u7fa4\u5927\u5c0f\uff0c\u4ee5\u53ca\u96c6\u7fa4\u4e0a\u5404\u8282\u70b9\u7684\u5730\u5740\u548c\u7aef\u53e3\u4fe1\u606f\u3002\u90a3\u4e48\u542f\u52a8\u65f6\uff0c\u4f60\u5c31\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e<code>initial-cluster<\/code>\u53c2\u6570\u8fdb\u884c etcd \u96c6\u7fa4\u7684\u542f\u52a8\u3002<\/p>\n<p>\u5728\u6bcf\u4e2a etcd \u673a\u5668\u542f\u52a8\u65f6\uff0c\u914d\u7f6e\u73af\u5883\u53d8\u91cf\u6216\u8005\u6dfb\u52a0\u542f\u52a8\u53c2\u6570\u7684\u65b9\u5f0f\u5982\u4e0b\u3002<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs ini\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-attr\">ETCD_INITIAL_CLUSTER<\/span>=<span class=\"hljs-string\">&#8220;infra0=http:\/\/10.0.1.10:2380,infra1=http:\/\/10.0.1.11:2380,infra2=http:\/\/10.0.1.12:2380&#8221;<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-attr\">ETCD_INITIAL_CLUSTER_STATE<\/span>=new<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs ini\"><\/code><\/pre>\n<p>\u53c2\u6570\u65b9\u6cd5\uff1a<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">infra0=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.10<\/span>:<span class=\"hljs-number\">2380<\/span>,http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.11<\/span>:<span class=\"hljs-number\">2380<\/span>,infra2=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.12<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster-state new<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<p><strong>\u503c\u5f97\u6ce8\u610f\u7684\u662f<\/strong>\uff0c<code>-initial-cluster<\/code>\u53c2\u6570\u4e2d\u914d\u7f6e\u7684 url \u5730\u5740\u5fc5\u987b\u4e0e\u5404\u4e2a\u8282\u70b9\u542f\u52a8\u65f6\u8bbe\u7f6e\u7684<code>initial-advertise-peer-urls<\/code>\u53c2\u6570\u76f8\u540c\u3002\uff08<code>initial-advertise-peer-urls<\/code>\u53c2\u6570\u8868\u793a\u8282\u70b9\u76d1\u542c\u5176\u4ed6\u8282\u70b9\u540c\u6b65\u4fe1\u53f7\u7684\u5730\u5740\uff09<\/p>\n<p>\u5982\u679c\u4f60\u6240\u5728\u7684\u7f51\u7edc\u73af\u5883\u914d\u7f6e\u4e86\u591a\u4e2a etcd \u96c6\u7fa4\uff0c\u4e3a\u4e86\u907f\u514d\u610f\u5916\u53d1\u751f\uff0c\u6700\u597d\u4f7f\u7528<code>-initial-cluster-token<\/code>\u53c2\u6570\u4e3a\u6bcf\u4e2a\u96c6\u7fa4\u5355\u72ec\u914d\u7f6e\u4e00\u4e2a token \u8ba4\u8bc1\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u786e\u4fdd\u6bcf\u4e2a\u96c6\u7fa4\u548c\u96c6\u7fa4\u7684\u6210\u5458\u90fd\u62e5\u6709\u72ec\u7279\u7684 ID\u3002<\/p>\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0c\u5982\u679c\u4f60\u8981\u914d\u7f6e\u5305\u542b 3 \u4e2a etcd \u8282\u70b9\u7684\u96c6\u7fa4\uff0c\u90a3\u4e48\u4f60\u5728\u4e09\u4e2a\u673a\u5668\u4e0a\u7684\u542f\u52a8\u547d\u4ee4\u5206\u522b\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">$ etcd -name infra0 -initial-advertise-peer-urls http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.10<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-listen-peer-urls http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.10<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster-token etcd-cluster-<span class=\"hljs-number\">1<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster infra0=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.10<\/span>:<span class=\"hljs-number\">2380<\/span>,infra1=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.11<\/span>:<span class=\"hljs-number\">2380<\/span>,infra2=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.12<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"6\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster-state new<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"7\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"8\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">$ etcd -name infra1 -initial-advertise-peer-urls http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.11<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"9\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-listen-peer-urls http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.11<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"10\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster-token etcd-cluster-<span class=\"hljs-number\">1<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"11\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster infra0=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.10<\/span>:<span class=\"hljs-number\">2380<\/span>,infra1=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.11<\/span>:<span class=\"hljs-number\">2380<\/span>,infra2=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.12<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"12\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster-state new<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"13\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"14\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">$ etcd -name infra2 -initial-advertise-peer-urls http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.12<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"15\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-listen-peer-urls http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.12<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"16\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster-token etcd-cluster-<span class=\"hljs-number\">1<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"17\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster infra0=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.10<\/span>:<span class=\"hljs-number\">2380<\/span>,infra1=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.11<\/span>:<span class=\"hljs-number\">2380<\/span>,infra2=http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.12<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"18\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-initial-cluster-state new<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<p>\u5728\u521d\u59cb\u5316\u5b8c\u6210\u540e\uff0cetcd \u8fd8\u63d0\u4f9b\u52a8\u6001\u589e\u3001\u5220\u3001\u6539 etcd \u96c6\u7fa4\u8282\u70b9\u7684\u529f\u80fd\uff0c\u8fd9\u4e2a\u9700\u8981\u7528\u5230<code>etcdctl<\/code>\u547d\u4ee4\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<h5 id=\"heading16\" data-id-_2ff1d7e60689=\"1\">4.1.2. etcd \u81ea\u53d1\u73b0\u6a21\u5f0f<\/h5>\n<p>\u901a\u8fc7\u81ea\u53d1\u73b0\u7684\u65b9\u5f0f\u542f\u52a8 etcd \u96c6\u7fa4\u9700\u8981\u4e8b\u5148\u51c6\u5907\u4e00\u4e2a etcd \u96c6\u7fa4\u3002\u5982\u679c\u4f60\u5df2\u7ecf\u6709\u4e00\u4e2a etcd \u96c6\u7fa4\uff0c\u9996\u5148\u4f60\u53ef\u4ee5\u6267\u884c\u5982\u4e0b\u547d\u4ee4\u8bbe\u5b9a\u96c6\u7fa4\u7684\u5927\u5c0f\uff0c\u5047\u8bbe\u4e3a 3.<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">$ curl -X PUT http:<span class=\"hljs-regexp\">\/\/my<\/span>etcd.local<span class=\"hljs-regexp\">\/v2\/<\/span>keys<span class=\"hljs-regexp\">\/discovery\/<\/span><span class=\"hljs-number\">6<\/span>c007a14875d53d9bf0ef5a6fc0257c817f0fb83<span class=\"hljs-regexp\">\/_config\/<\/span>size -d value=<span class=\"hljs-number\">3<\/span><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<p>\u7136\u540e\u4f60\u8981\u628a\u8fd9\u4e2a url \u5730\u5740<code>http:\/\/myetcd.local\/v2\/keys\/discovery\/6c007a14875d53d9bf0ef5a6fc0257c817f0fb83<\/code>\u4f5c\u4e3a<code>-discovery<\/code>\u53c2\u6570\u6765\u542f\u52a8 etcd\u3002\u8282\u70b9\u4f1a\u81ea\u52a8\u4f7f\u7528<code>http:\/\/myetcd.local\/v2\/keys\/discovery\/6c007a14875d53d9bf0ef5a6fc0257c817f0fb83<\/code>\u76ee\u5f55\u8fdb\u884c etcd \u7684\u6ce8\u518c\u548c\u53d1\u73b0\u670d\u52a1\u3002<\/p>\n<p>\u6240\u4ee5\u6700\u7ec8\u4f60\u5728\u67d0\u4e2a\u673a\u5668\u4e0a\u542f\u52a8 etcd \u7684\u547d\u4ee4\u5982\u4e0b\u3002<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">$ etcd -name infra0 -initial-advertise-peer-urls http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.10<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-listen-peer-urls http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">10.0<\/span>.<span class=\"hljs-number\">1.10<\/span>:<span class=\"hljs-number\">2380<\/span> \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">-discovery http:<span class=\"hljs-regexp\">\/\/my<\/span>etcd.local<span class=\"hljs-regexp\">\/v2\/<\/span>keys<span class=\"hljs-regexp\">\/discovery\/<\/span><span class=\"hljs-number\">6<\/span>c007a14875d53d9bf0ef5a6fc0257c817f0fb83<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<p>\u5982\u679c\u4f60\u672c\u5730\u6ca1\u6709\u53ef\u7528\u7684 etcd \u96c6\u7fa4\uff0cetcd \u5b98\u7f51\u63d0\u4f9b\u4e86\u4e00\u4e2a\u53ef\u4ee5\u516c\u7f51\u8bbf\u95ee\u7684 etcd \u5b58\u50a8\u5730\u5740\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u5982\u4e0b\u547d\u4ee4\u5f97\u5230 etcd \u670d\u52a1\u7684\u76ee\u5f55\uff0c\u5e76\u628a\u5b83\u4f5c\u4e3a<code>-discovery<\/code>\u53c2\u6570\u4f7f\u7528\u3002<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">$ curl http:<span class=\"hljs-regexp\">\/\/<\/span>discovery.etcd.io\/new?size=<span class=\"hljs-number\">3<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">http:<span class=\"hljs-regexp\">\/\/<\/span>discovery.etcd.io\/<span class=\"hljs-number\">3<\/span>e86b59982e49066c5d813af1c2e2579cbf573de<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<p>\u540c\u6837\u7684\uff0c\u5f53\u4f60\u5b8c\u6210\u4e86\u96c6\u7fa4\u7684\u521d\u59cb\u5316\u540e\uff0c\u8fd9\u4e9b\u4fe1\u606f\u5c31\u5931\u53bb\u4e86\u4f5c\u7528\u3002\u5f53\u4f60\u9700\u8981\u589e\u52a0\u8282\u70b9\u65f6\uff0c\u9700\u8981\u4f7f\u7528<code>etcdctl<\/code>\u6765\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u4e3a\u4e86\u5b89\u5168\uff0c\u8bf7\u52a1\u5fc5\u6bcf\u6b21\u542f\u52a8\u65b0 etcd \u96c6\u7fa4\u65f6\uff0c\u90fd\u4f7f\u7528\u65b0\u7684 discovery token \u8fdb\u884c\u6ce8\u518c\u3002\u53e6\u5916\uff0c\u5982\u679c\u4f60\u521d\u59cb\u5316\u65f6\u542f\u52a8\u7684\u8282\u70b9\u8d85\u8fc7\u4e86\u6307\u5b9a\u7684\u6570\u91cf\uff0c\u591a\u4f59\u7684\u8282\u70b9\u4f1a\u81ea\u52a8\u8f6c\u5316\u4e3a Proxy \u6a21\u5f0f\u7684 etcd\u3002<\/p>\n<h5 id=\"heading17\" data-id-_2714991df437=\"1\">4.1.3. DNS \u81ea\u53d1\u73b0\u6a21\u5f0f<\/h5>\n<p>etcd \u8fd8\u652f\u6301\u4f7f\u7528 DNS SRV \u8bb0\u5f55\u8fdb\u884c\u542f\u52a8\u3002\u5173\u4e8e DNS SRV \u8bb0\u5f55\u5982\u4f55\u8fdb\u884c\u670d\u52a1\u53d1\u73b0\uff0c\u53ef\u4ee5\u53c2\u9605<a href=\"http:\/\/tools.ietf.org\/html\/rfc2782\" target=\"_blank\" rel=\"noopener nofollow\">\u00a0RFC2782\u00a0<\/a>\uff0c\u6240\u4ee5\uff0c\u4f60\u8981\u5728 DNS \u670d\u52a1\u5668\u4e0a\u8fdb\u884c\u76f8\u5e94\u7684\u914d\u7f6e\u3002<\/p>\n<p>(1) \u5f00\u542f DNS \u670d\u52a1\u5668\u4e0a SRV \u8bb0\u5f55\u67e5\u8be2\uff0c\u5e76\u6dfb\u52a0\u76f8\u5e94\u7684\u57df\u540d\u8bb0\u5f55\uff0c\u4f7f\u5f97\u67e5\u8be2\u5230\u7684\u7ed3\u679c\u7c7b\u4f3c\u5982\u4e0b\u3002<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs stylus\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">$ dig +noall +answer SRV _etcd-server._tcp<span class=\"hljs-selector-class\">.example<\/span><span class=\"hljs-selector-class\">.com<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">_etcd-server._tcp<span class=\"hljs-selector-class\">.example<\/span><span class=\"hljs-selector-class\">.com<\/span>. <span class=\"hljs-number\">300<\/span> IN SRV <span class=\"hljs-number\">0<\/span> <span class=\"hljs-number\">0<\/span> <span class=\"hljs-number\">2380<\/span> infra0<span class=\"hljs-selector-class\">.example<\/span><span class=\"hljs-selector-class\">.com<\/span>.<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">_etcd-server._tcp<span class=\"hljs-selector-class\">.example<\/span><span class=\"hljs-selector-class\">.com<\/span>. <span class=\"hljs-number\">300<\/span> IN SRV <span class=\"hljs-number\">0<\/span> <span class=\"hljs-number\">0<\/span> <span class=\"hljs-number\">2380<\/span> infra1<span class=\"hljs-selector-class\">.example<\/span><span class=\"hljs-selector-class\">.com<\/span>.<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">_etcd-server._tcp<span class=\"hljs-selector-class\">.example<\/span><span class=\"hljs-selector-class\">.com<\/span>. <span class=\"hljs-number\">300<\/span> IN SRV <span class=\"hljs-number\">0<\/span> <span class=\"hljs-number\">0<\/span> <span class=\"hljs-number\">2380<\/span> infra2<span class=\"hljs-selector-class\">.example<\/span><span class=\"hljs-selector-class\">.com<\/span>.<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs stylus\"><\/code><\/pre>\n<p>(2) \u5206\u522b\u4e3a\u5404\u4e2a\u57df\u540d\u914d\u7f6e\u76f8\u5173\u7684 A \u8bb0\u5f55\u6307\u5411 etcd \u6838\u5fc3\u8282\u70b9\u5bf9\u5e94\u7684\u673a\u5668 IP\u3002\u4f7f\u5f97\u67e5\u8be2\u7ed3\u679c\u7c7b\u4f3c\u5982\u4e0b\u3002<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs angelscript\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">$ dig +noall +answer infra0.example.com infra1.example.com infra2.example.com<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">infra0.example.com. <span class=\"hljs-number\">300<\/span> IN A <span class=\"hljs-number\">10.0<\/span><span class=\"hljs-number\">.1<\/span><span class=\"hljs-number\">.10<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">infra1.example.com. <span class=\"hljs-number\">300<\/span> IN A <span class=\"hljs-number\">10.0<\/span><span class=\"hljs-number\">.1<\/span><span class=\"hljs-number\">.11<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">infra2.example.com. <span class=\"hljs-number\">300<\/span> IN A <span class=\"hljs-number\">10.0<\/span><span class=\"hljs-number\">.1<\/span><span class=\"hljs-number\">.12<\/span><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs angelscript\"><\/code><\/pre>\n<p>\u505a\u597d\u4e86\u4e0a\u8ff0\u4e24\u6b65 DNS \u7684\u914d\u7f6e\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528 DNS \u542f\u52a8 etcd \u96c6\u7fa4\u4e86\u3002\u914d\u7f6e DNS \u89e3\u6790\u7684 url \u53c2\u6570\u4e3a<code>-discovery-srv<\/code>\uff0c\u5176\u4e2d\u67d0\u4e00\u4e2a\u8282\u70b9\u5730\u542f\u52a8\u547d\u4ee4\u5982\u4e0b\u3002<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs haml\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">$ etcd -name infra0 \\<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211;<span class=\"ruby\">discovery-srv example.com \\<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211;<span class=\"ruby\">initial-advertise-peer-urls <span class=\"hljs-symbol\">http:<\/span>\/<span class=\"hljs-regexp\">\/infra0.example.com:2380 \\<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211;<span class=\"ruby\"><span class=\"hljs-regexp\">initial-cluster-token etcd-cluster-1 \\<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"6\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211;<span class=\"ruby\"><span class=\"hljs-regexp\">initial-cluster-state new \\<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"7\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211;<span class=\"ruby\"><span class=\"hljs-regexp\">advertise-client-urls http:\/<\/span><span class=\"hljs-regexp\">\/infra0.example.com:2379 \\<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"8\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211;<span class=\"ruby\"><span class=\"hljs-regexp\">listen-client-urls http:\/<\/span><span class=\"hljs-regexp\">\/infra0.example.com:2379 \\<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"9\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211;<span class=\"ruby\"><span class=\"hljs-regexp\">listen-peer-urls http:\/<\/span><span class=\"hljs-regexp\">\/infra0.example.com:2380<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"10\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs haml\"><\/code><\/pre>\n<p>\u5f53\u7136\uff0c\u4f60\u4e5f\u53ef\u4ee5\u76f4\u63a5\u628a\u8282\u70b9\u7684\u57df\u540d\u6539\u6210 IP \u6765\u542f\u52a8\u3002<\/p>\n<h4 id=\"heading18\" data-id-_7c717342dce8=\"1\">4.2 \u5173\u952e\u90e8\u5206\u6e90\u7801\u89e3\u6790<\/h4>\n<p>etcd \u7684\u542f\u52a8\u662f\u4ece\u4e3b\u76ee\u5f55\u4e0b\u7684<code>main.go<\/code>\u5f00\u59cb\u7684\uff0c\u7136\u540e\u8fdb\u5165<code>etcdmain\/etcd.go<\/code>\uff0c\u8f7d\u5165\u914d\u7f6e\u53c2\u6570\u3002\u5982\u679c\u88ab\u914d\u7f6e\u4e3a Proxy \u6a21\u5f0f\uff0c\u5219\u8fdb\u5165 startProxy \u51fd\u6570\uff0c\u5426\u5219\u8fdb\u5165 startEtcd\uff0c\u5f00\u542f etcd \u670d\u52a1\u6a21\u5757\u548c http \u8bf7\u6c42\u5904\u7406\u6a21\u5757\u3002<\/p>\n<p>\u5728\u542f\u52a8 http \u76d1\u542c\u65f6\uff0c\u4e3a\u4e86\u4fdd\u6301\u4e0e\u96c6\u7fa4\u5176\u4ed6 etcd \u673a\u5668\uff08peers\uff09\u4fdd\u6301\u8fde\u63a5\uff0c\u90fd\u91c7\u7528\u7684<code>transport.NewTimeoutListener<\/code>\u542f\u52a8\u65b9\u5f0f\uff0c\u8fd9\u6837\u5728\u8d85\u8fc7\u6307\u5b9a\u65f6\u95f4\u6ca1\u6709\u83b7\u5f97\u54cd\u5e94\u65f6\u5c31\u4f1a\u51fa\u73b0\u8d85\u65f6\u9519\u8bef\u3002\u800c\u5728\u76d1\u542c client \u8bf7\u6c42\u65f6\uff0c\u91c7\u7528\u7684\u662f<code>transport.NewKeepAliveListener<\/code>\uff0c\u6709\u52a9\u4e8e\u8fde\u63a5\u7684\u7a33\u5b9a\u3002<\/p>\n<p>\u5728<code>etcdmain\/etcd.go<\/code>\u4e2d\u7684 setupCluster \u51fd\u6570\u53ef\u4ee5\u770b\u5230\uff0c\u6839\u636e\u4e0d\u540c etcd \u7684\u53c2\u6570\uff0c\u542f\u52a8\u96c6\u7fa4\u7684\u65b9\u6cd5\u7565\u6709\u4e0d\u540c\uff0c\u4f46\u662f\u6700\u7ec8\u9700\u8981\u7684\u5c31\u662f\u4e00\u4e2a IP \u4e0e\u7aef\u53e3\u6784\u6210\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<p>\u5728\u9759\u6001\u914d\u7f6e\u7684\u542f\u52a8\u65b9\u5f0f\u4e2d\uff0c\u96c6\u7fa4\u7684\u6240\u6709\u4fe1\u606f\u90fd\u5df2\u7ecf\u5728\u7ed9\u51fa\uff0c\u6240\u4ee5\u76f4\u63a5\u89e3\u6790\u7528\u9017\u53f7\u9694\u5f00\u7684\u96c6\u7fa4 url \u4fe1\u606f\u5c31\u597d\u4e86\u3002<\/p>\n<p>DNS \u53d1\u73b0\u7684\u65b9\u5f0f\u7c7b\u4f3c\uff0c\u4f1a\u9884\u5148\u53d1\u9001\u4e00\u4e2a tcp \u7684 SRV \u8bf7\u6c42\uff0c\u5148\u67e5\u770b<code>etcd-server-ssl._tcp.example.com<\/code>\u4e0b\u662f\u5426\u6709\u96c6\u7fa4\u7684\u57df\u540d\u4fe1\u606f\uff0c\u5982\u679c\u6ca1\u6709\u627e\u5230\uff0c\u5219\u53bb\u67e5\u770b<code>etcd-server._tcp.example.com<\/code>\u3002\u6839\u636e\u627e\u5230\u7684\u57df\u540d\uff0c\u89e3\u6790\u51fa\u5bf9\u5e94\u7684 IP \u548c\u7aef\u53e3\uff0c\u5373\u96c6\u7fa4\u7684 url \u4fe1\u606f\u3002<\/p>\n<p>\u8f83\u4e3a\u590d\u6742\u662f etcd \u5f0f\u7684\u81ea\u53d1\u73b0\u542f\u52a8\u3002\u9996\u5148\u5c31\u7528\u81ea\u8eab\u5355\u4e2a\u7684 url \u6784\u6210\u4e00\u4e2a\u96c6\u7fa4\uff0c\u7136\u540e\u5728\u542f\u52a8\u7684\u8fc7\u7a0b\u4e2d\u6839\u636e\u53c2\u6570\u8fdb\u5165<code>discovery\/discovery.go<\/code>\u6e90\u7801\u7684<code>JoinCluster<\/code>\u51fd\u6570\u3002\u56e0\u4e3a\u6211\u4eec\u4e8b\u5148\u662f\u77e5\u9053\u542f\u52a8\u65f6\u4f7f\u7528\u7684 etcd \u7684 token \u5730\u5740\u7684\uff0c\u91cc\u9762\u5305\u542b\u4e86\u96c6\u7fa4\u5927\u5c0f (size) \u4fe1\u606f\u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u5176\u5b9e\u662f\u4e2a\u4e0d\u65ad\u76d1\u6d4b\u4e0e\u7b49\u5f85\u7684\u8fc7\u7a0b\u3002\u542f\u52a8\u7684\u7b2c\u4e00\u6b65\u5c31\u662f\u5728\u8fd9\u4e2a etcd \u7684 token \u76ee\u5f55\u4e0b\u6ce8\u518c\u81ea\u8eab\u7684\u4fe1\u606f\uff0c\u7136\u540e\u518d\u76d1\u6d4b token \u76ee\u5f55\u4e0b\u6240\u6709\u8282\u70b9\u7684\u6570\u91cf\uff0c\u5982\u679c\u6570\u91cf\u6ca1\u6709\u8fbe\u6807\uff0c\u5219\u5faa\u73af\u7b49\u5f85\u3002\u5f53\u6570\u91cf\u8fbe\u5230\u8981\u6c42\u65f6\uff0c\u624d\u7ed3\u675f\uff0c\u8fdb\u5165\u6b63\u5e38\u7684\u542f\u52a8\u8fc7\u7a0b\u3002<\/p>\n<p>\u914d\u7f6e etcd \u8fc7\u7a0b\u4e2d\u901a\u5e38\u8981\u7528\u5230\u4e24\u79cd url \u5730\u5740\u5bb9\u6613\u6df7\u6dc6\uff0c\u4e00\u79cd\u7528\u4e8e etcd \u96c6\u7fa4\u540c\u6b65\u4fe1\u606f\u5e76\u4fdd\u6301\u8fde\u63a5\uff0c\u901a\u5e38\u79f0\u4e3a peer-urls\uff1b\u53e6\u5916\u4e00\u79cd\u7528\u4e8e\u63a5\u6536\u7528\u6237\u7aef\u53d1\u6765\u7684 HTTP \u8bf7\u6c42\uff0c\u901a\u5e38\u79f0\u4e3a client-urls\u3002<\/p>\n<ul>\n<li><code>peer-urls<\/code>\uff1a\u901a\u5e38\u76d1\u542c\u7684\u7aef\u53e3\u4e3a<code>2380<\/code>\uff08\u8001\u7248\u672c\u4f7f\u7528\u7684\u7aef\u53e3\u4e3a<code>7001<\/code>\uff09\uff0c\u5305\u62ec\u6240\u6709\u5df2\u7ecf\u5728\u96c6\u7fa4\u4e2d\u6b63\u5e38\u5de5\u4f5c\u7684\u6240\u6709\u8282\u70b9\u7684\u5730\u5740\u3002<\/li>\n<li><code>client-urls<\/code>\uff1a\u901a\u5e38\u76d1\u542c\u7684\u7aef\u53e3\u4e3a<code>2379<\/code>\uff08\u8001\u7248\u672c\u4f7f\u7528\u7684\u7aef\u53e3\u4e3a<code>4001<\/code>\uff09\uff0c\u4e3a\u9002\u5e94\u590d\u6742\u7684\u7f51\u7edc\u73af\u5883\uff0c\u65b0\u7248 etcd \u76d1\u542c\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684 url \u4ece\u539f\u6765\u7684 1 \u4e2a\u53d8\u4e3a\u73b0\u5728\u53ef\u914d\u7f6e\u7684\u591a\u4e2a\u3002\u8fd9\u6837 etcd \u53ef\u4ee5\u914d\u5408\u591a\u5757\u7f51\u5361\u540c\u65f6\u76d1\u542c\u4e0d\u540c\u7f51\u7edc\u4e0b\u7684\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n<h4 id=\"heading19\" data-id-_2e118bfb1dc7=\"1\">4.3 \u8fd0\u884c\u65f6\u8282\u70b9\u53d8\u66f4<\/h4>\n<p>etcd \u96c6\u7fa4\u542f\u52a8\u5b8c\u6bd5\u540e\uff0c\u53ef\u4ee5\u5728\u8fd0\u884c\u7684\u8fc7\u7a0b\u4e2d\u5bf9\u96c6\u7fa4\u8fdb\u884c\u91cd\u6784\uff0c\u5305\u62ec\u6838\u5fc3\u8282\u70b9\u7684\u589e\u52a0\u3001\u5220\u9664\u3001\u8fc1\u79fb\u3001\u66ff\u6362\u7b49\u3002<strong>\u8fd0\u884c\u65f6\u91cd\u6784\u4f7f\u5f97 etcd \u96c6\u7fa4\u65e0\u987b\u91cd\u542f\u5373\u53ef\u6539\u53d8\u96c6\u7fa4\u7684\u914d\u7f6e\uff0c\u8fd9\u4e5f\u662f\u65b0\u7248 etcd \u533a\u522b\u4e8e\u65e7\u7248\u5305\u542b\u7684\u65b0\u7279\u6027\u3002<\/strong><\/p>\n<p>\u53ea\u6709\u5f53\u96c6\u7fa4\u4e2d\u591a\u6570\u8282\u70b9\u6b63\u5e38\u7684\u60c5\u51b5\u4e0b\uff0c\u4f60\u624d\u53ef\u4ee5\u8fdb\u884c\u8fd0\u884c\u65f6\u7684\u914d\u7f6e\u7ba1\u7406\u3002\u56e0\u4e3a\u914d\u7f6e\u66f4\u6539\u7684\u4fe1\u606f\u4e5f\u4f1a\u88ab etcd \u5f53\u6210\u4e00\u4e2a\u4fe1\u606f\u5b58\u50a8\u548c\u540c\u6b65\uff0c\u5982\u679c\u96c6\u7fa4\u591a\u6570\u8282\u70b9\u635f\u574f\uff0c\u96c6\u7fa4\u5c31\u5931\u53bb\u4e86\u5199\u5165\u6570\u636e\u7684\u80fd\u529b\u3002\u6240\u4ee5\u5728\u914d\u7f6e etcd \u96c6\u7fa4\u6570\u91cf\u65f6\uff0c\u5f3a\u70c8\u63a8\u8350\u81f3\u5c11\u914d\u7f6e 3 \u4e2a\u6838\u5fc3\u8282\u70b9\u3002<\/p>\n<h5 id=\"heading20\" data-id-_196088d3b0f6=\"1\">4.3.1. \u8282\u70b9\u8fc1\u79fb\u3001\u66ff\u6362<\/h5>\n<p>\u5f53\u4f60\u8282\u70b9\u6240\u5728\u7684\u673a\u5668\u51fa\u73b0\u786c\u4ef6\u6545\u969c\uff0c\u6216\u8005\u8282\u70b9\u51fa\u73b0\u5982\u6570\u636e\u76ee\u5f55\u635f\u574f\u7b49\u95ee\u9898\uff0c\u5bfc\u81f4\u8282\u70b9\u6c38\u4e45\u6027\u7684\u4e0d\u53ef\u6062\u590d\u65f6\uff0c\u5c31\u9700\u8981\u5bf9\u8282\u70b9\u8fdb\u884c\u8fc1\u79fb\u6216\u8005\u66ff\u6362\u3002\u5f53\u4e00\u4e2a\u8282\u70b9\u5931\u6548\u4ee5\u540e\uff0c\u5fc5\u987b\u5c3d\u5feb\u4fee\u590d\uff0c\u56e0\u4e3a etcd \u96c6\u7fa4\u6b63\u5e38\u8fd0\u884c\u7684\u5fc5\u8981\u6761\u4ef6\u662f\u96c6\u7fa4\u4e2d\u591a\u6570\u8282\u70b9\u90fd\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n<p>\u8fc1\u79fb\u4e00\u4e2a\u8282\u70b9\u9700\u8981\u8fdb\u884c\u56db\u6b65\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li>\u6682\u505c\u6b63\u5728\u8fd0\u884c\u7740\u7684\u8282\u70b9\u7a0b\u5e8f\u8fdb\u7a0b<\/li>\n<li>\u628a\u6570\u636e\u76ee\u5f55\u4ece\u73b0\u6709\u673a\u5668\u62f7\u8d1d\u5230\u65b0\u673a\u5668<\/li>\n<li>\u4f7f\u7528 api \u66f4\u65b0 etcd \u4e2d\u5bf9\u5e94\u8282\u70b9\u6307\u5411\u673a\u5668\u7684 url \u8bb0\u5f55\u66f4\u65b0\u4e3a\u65b0\u673a\u5668\u7684 ip<\/li>\n<li>\u4f7f\u7528\u540c\u6837\u7684\u914d\u7f6e\u9879\u548c\u6570\u636e\u76ee\u5f55\uff0c\u5728\u65b0\u7684\u673a\u5668\u4e0a\u542f\u52a8 etcd\u3002<\/li>\n<\/ul>\n<h5 id=\"heading21\" data-id-_6ef7ff580920=\"1\">4.3.2. \u8282\u70b9\u589e\u52a0<\/h5>\n<p>\u589e\u52a0\u8282\u70b9\u53ef\u4ee5\u8ba9 etcd \u7684\u9ad8\u53ef\u7528\u6027\u66f4\u5f3a\u3002\u4e3e\u4f8b\u6765\u8bf4\uff0c\u5982\u679c\u4f60\u6709 3 \u4e2a\u8282\u70b9\uff0c\u90a3\u4e48\u6700\u591a\u5141\u8bb8 1 \u4e2a\u8282\u70b9\u5931\u6548\uff1b\u5f53\u4f60\u6709 5 \u4e2a\u8282\u70b9\u65f6\uff0c\u5c31\u53ef\u4ee5\u5141\u8bb8\u6709 2 \u4e2a\u8282\u70b9\u5931\u6548\u3002\u540c\u65f6\uff0c\u589e\u52a0\u8282\u70b9\u8fd8\u53ef\u4ee5\u8ba9 etcd \u96c6\u7fa4\u5177\u6709\u66f4\u597d\u7684\u8bfb\u6027\u80fd\u3002\u56e0\u4e3a etcd \u7684\u8282\u70b9\u90fd\u662f\u5b9e\u65f6\u540c\u6b65\u7684\uff0c\u6bcf\u4e2a\u8282\u70b9\u4e0a\u90fd\u5b58\u50a8\u4e86\u6240\u6709\u7684\u4fe1\u606f\uff0c\u6240\u4ee5\u589e\u52a0\u8282\u70b9\u53ef\u4ee5\u4ece\u6574\u4f53\u4e0a\u63d0\u5347\u8bfb\u7684\u541e\u5410\u91cf\u3002<\/p>\n<p>\u589e\u52a0\u4e00\u4e2a\u8282\u70b9\u9700\u8981\u8fdb\u884c\u4e24\u6b65\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li>\u5728\u96c6\u7fa4\u4e2d\u6dfb\u52a0\u8fd9\u4e2a\u8282\u70b9\u7684 url \u8bb0\u5f55\uff0c\u540c\u65f6\u83b7\u5f97\u96c6\u7fa4\u7684\u4fe1\u606f\u3002<\/li>\n<li>\u4f7f\u7528\u83b7\u5f97\u7684\u96c6\u7fa4\u4fe1\u606f\u542f\u52a8\u65b0 etcd \u8282\u70b9\u3002<\/li>\n<\/ul>\n<h5 id=\"heading22\" data-id-_6062137df88b=\"1\">4.3.3. \u8282\u70b9\u79fb\u9664<\/h5>\n<p>\u6709\u65f6\u4f60\u4e0d\u5f97\u4e0d\u5728\u63d0\u9ad8 etcd \u7684\u5199\u6027\u80fd\u548c\u589e\u52a0\u96c6\u7fa4\u9ad8\u53ef\u7528\u6027\u4e0a\u8fdb\u884c\u6743\u8861\u3002Leader \u8282\u70b9\u5728\u63d0\u4ea4\u4e00\u4e2a\u5199\u8bb0\u5f55\u65f6\uff0c\u4f1a\u628a\u8fd9\u4e2a\u6d88\u606f\u540c\u6b65\u5230\u6bcf\u4e2a\u8282\u70b9\u4e0a\uff0c\u5f53\u5f97\u5230\u591a\u6570\u8282\u70b9\u7684\u540c\u610f\u53cd\u9988\u540e\uff0c\u624d\u4f1a\u771f\u6b63\u5199\u5165\u6570\u636e\u3002\u6240\u4ee5\u8282\u70b9\u8d8a\u591a\uff0c\u5199\u5165\u6027\u80fd\u8d8a\u5dee\u3002\u5728\u8282\u70b9\u8fc7\u591a\u65f6\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u79fb\u9664\u4e00\u4e2a\u6216\u591a\u4e2a\u3002<\/p>\n<p>\u79fb\u9664\u8282\u70b9\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u8981\u4e00\u6b65\u64cd\u4f5c\uff0c\u5c31\u662f\u628a\u96c6\u7fa4\u4e2d\u8fd9\u4e2a\u8282\u70b9\u7684\u8bb0\u5f55\u5220\u9664\u3002\u7136\u540e\u5bf9\u5e94\u673a\u5668\u4e0a\u7684\u8be5\u8282\u70b9\u5c31\u4f1a\u81ea\u52a8\u505c\u6b62\u3002<\/p>\n<h5 id=\"heading23\" data-id-_8f3ca241577b=\"1\">4.3.4. \u5f3a\u5236\u6027\u91cd\u542f\u96c6\u7fa4<\/h5>\n<p>\u5f53\u96c6\u7fa4\u8d85\u8fc7\u534a\u6570\u7684\u8282\u70b9\u90fd\u5931\u6548\u65f6\uff0c\u5c31\u9700\u8981\u901a\u8fc7\u624b\u52a8\u7684\u65b9\u5f0f\uff0c\u5f3a\u5236\u6027\u8ba9\u67d0\u4e2a\u8282\u70b9\u4ee5\u81ea\u5df1\u4e3a Leader\uff0c\u5229\u7528\u539f\u6709\u6570\u636e\u542f\u52a8\u4e00\u4e2a\u65b0\u96c6\u7fa4\u3002<\/p>\n<p>\u6b64\u65f6\u4f60\u9700\u8981\u8fdb\u884c\u4e24\u6b65\u64cd\u4f5c\u3002<\/p>\n<ul>\n<li>\u5907\u4efd\u539f\u6709\u6570\u636e\u5230\u65b0\u673a\u5668\u3002<\/li>\n<li>\u4f7f\u7528<code>-force-new-cluster<\/code>\u52a0\u5907\u4efd\u7684\u6570\u636e\u91cd\u65b0\u542f\u52a8\u8282\u70b9<\/li>\n<\/ul>\n<p><strong>\u6ce8\u610f\uff1a\u5f3a\u5236\u6027\u91cd\u542f\u662f\u4e00\u4e2a\u8feb\u4e0d\u5f97\u5df2\u7684\u9009\u62e9\uff0c\u5b83\u4f1a\u7834\u574f\u4e00\u81f4\u6027\u534f\u8bae\u4fdd\u8bc1\u7684\u5b89\u5168\u6027\uff08\u5982\u679c\u64cd\u4f5c\u65f6\u96c6\u7fa4\u4e2d\u5c1a\u6709\u5176\u5b83\u8282\u70b9\u5728\u6b63\u5e38\u5de5\u4f5c\uff0c\u5c31\u4f1a\u51fa\u9519\uff09\uff0c\u6240\u4ee5\u5728\u64cd\u4f5c\u524d\u8bf7\u52a1\u5fc5\u8981\u4fdd\u5b58\u597d\u6570\u636e\u3002<\/strong><\/p>\n<h3 id=\"heading24\" data-id-_56a99c8edb96=\"1\">5 Proxy \u6a21\u5f0f<\/h3>\n<p><strong>Proxy \u6a21\u5f0f\u4e5f\u662f\u65b0\u7248 etcd \u7684\u4e00\u4e2a\u91cd\u8981\u53d8\u66f4<\/strong>\uff0cetcd \u4f5c\u4e3a\u4e00\u4e2a\u53cd\u5411\u4ee3\u7406\u628a\u5ba2\u6237\u7684\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u53ef\u7528\u7684 etcd \u96c6\u7fa4\u3002\u8fd9\u6837\uff0c\u4f60\u5c31\u53ef\u4ee5\u5728\u6bcf\u4e00\u53f0\u673a\u5668\u90fd\u90e8\u7f72\u4e00\u4e2a Proxy \u6a21\u5f0f\u7684 etcd \u4f5c\u4e3a\u672c\u5730\u670d\u52a1\uff0c\u5982\u679c\u8fd9\u4e9b etcd Proxy \u90fd\u80fd\u6b63\u5e38\u8fd0\u884c\uff0c\u90a3\u4e48\u4f60\u7684\u670d\u52a1\u53d1\u73b0\u5fc5\u7136\u662f\u7a33\u5b9a\u53ef\u9760\u7684\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/fd\/0f\/fd17db8d2165fb60009b77bd4810410f.jpg\" alt=\"\" \/><\/p>\n<p><strong>\u56fe 11 Proxy \u6a21\u5f0f\u793a\u610f\u56fe<\/strong><\/p>\n<p>\u6240\u4ee5 Proxy \u5e76\u4e0d\u662f\u76f4\u63a5\u52a0\u5165\u5230\u7b26\u5408\u5f3a\u4e00\u81f4\u6027\u7684 etcd \u96c6\u7fa4\u4e2d\uff0c\u4e5f\u540c\u6837\u7684\uff0cProxy \u5e76\u6ca1\u6709\u589e\u52a0\u96c6\u7fa4\u7684\u53ef\u9760\u6027\uff0c\u5f53\u7136\u4e5f\u6ca1\u6709\u964d\u4f4e\u96c6\u7fa4\u7684\u5199\u5165\u6027\u80fd\u3002<\/p>\n<h4 id=\"heading25\" data-id-_54959e4ede44=\"1\">5.1 Proxy \u53d6\u4ee3 Standby \u6a21\u5f0f\u7684\u539f\u56e0<\/h4>\n<p>\u90a3\u4e48\uff0c\u4e3a\u4ec0\u4e48\u8981\u6709 Proxy \u6a21\u5f0f\u800c\u4e0d\u662f\u76f4\u63a5\u589e\u52a0 etcd \u6838\u5fc3\u8282\u70b9\u5462\uff1f\u5b9e\u9645\u4e0a etcd \u6bcf\u589e\u52a0\u4e00\u4e2a\u6838\u5fc3\u8282\u70b9\uff08peer\uff09\uff0c\u90fd\u4f1a\u589e\u52a0 Leader \u8282\u70b9\u4e00\u5b9a\u7a0b\u5ea6\u7684\u5305\u62ec\u7f51\u7edc\u3001CPU \u548c\u78c1\u76d8\u7684\u8d1f\u62c5\uff0c\u56e0\u4e3a\u6bcf\u6b21\u4fe1\u606f\u7684\u53d8\u5316\u90fd\u9700\u8981\u8fdb\u884c\u540c\u6b65\u5907\u4efd\u3002\u589e\u52a0 etcd \u7684\u6838\u5fc3\u8282\u70b9\u53ef\u4ee5\u8ba9\u6574\u4e2a\u96c6\u7fa4\u5177\u6709\u66f4\u9ad8\u7684\u53ef\u9760\u6027\uff0c\u4f46\u662f\u5f53\u6570\u91cf\u8fbe\u5230\u4e00\u5b9a\u7a0b\u5ea6\u4ee5\u540e\uff0c\u589e\u52a0\u53ef\u9760\u6027\u5e26\u6765\u7684\u597d\u5904\u5c31\u53d8\u5f97\u4e0d\u90a3\u4e48\u660e\u663e\uff0c\u53cd\u5012\u662f\u964d\u4f4e\u4e86\u96c6\u7fa4\u5199\u5165\u540c\u6b65\u7684\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u589e\u52a0\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u7684 Proxy \u6a21\u5f0f etcd \u8282\u70b9\u662f\u5bf9\u76f4\u63a5\u589e\u52a0 etcd \u6838\u5fc3\u8282\u70b9\u7684\u4e00\u4e2a\u6709\u6548\u4ee3\u66ff\u3002<\/p>\n<p>\u719f\u6089 0.4.6 \u8fd9\u4e2a\u65e7\u7248\u672c etcd \u7684\u7528\u6237\u4f1a\u53d1\u73b0\uff0cProxy \u6a21\u5f0f\u5b9e\u9645\u4e0a\u662f\u53d6\u4ee3\u4e86\u539f\u5148\u7684 Standby \u6a21\u5f0f\u3002Standby \u6a21\u5f0f\u9664\u4e86\u8f6c\u53d1\u4ee3\u7406\u7684\u529f\u80fd\u4ee5\u5916\uff0c\u8fd8\u4f1a\u5728\u6838\u5fc3\u8282\u70b9\u56e0\u4e3a\u6545\u969c\u5bfc\u81f4\u6570\u91cf\u4e0d\u8db3\u7684\u65f6\u5019\uff0c\u4ece Standby \u6a21\u5f0f\u8f6c\u4e3a\u6b63\u5e38\u8282\u70b9\u6a21\u5f0f\u3002\u800c\u5f53\u90a3\u4e2a\u6545\u969c\u7684\u8282\u70b9\u6062\u590d\u65f6\uff0c\u53d1\u73b0 etcd \u7684\u6838\u5fc3\u8282\u70b9\u6570\u91cf\u5df2\u7ecf\u8fbe\u5230\u7684\u9884\u5148\u8bbe\u7f6e\u7684\u503c\uff0c\u5c31\u4f1a\u8f6c\u4e3a Standby \u6a21\u5f0f\u3002<\/p>\n<p>\u4f46\u662f\u65b0\u7248 etcd \u4e2d\uff0c\u53ea\u4f1a\u5728\u6700\u521d\u542f\u52a8 etcd \u96c6\u7fa4\u65f6\uff0c\u53d1\u73b0\u6838\u5fc3\u8282\u70b9\u7684\u6570\u91cf\u5df2\u7ecf\u6ee1\u8db3\u8981\u6c42\u65f6\uff0c\u81ea\u52a8\u542f\u7528 Proxy \u6a21\u5f0f\uff0c\u53cd\u4e4b\u5219\u5e76\u672a\u5b9e\u73b0\u3002\u4e3b\u8981\u539f\u56e0\u5982\u4e0b\u3002<\/p>\n<ul>\n<li>etcd \u662f\u7528\u6765\u4fdd\u8bc1\u9ad8\u53ef\u7528\u7684\u7ec4\u4ef6\uff0c\u56e0\u6b64\u5b83\u6240\u9700\u8981\u7684\u7cfb\u7edf\u8d44\u6e90\uff08\u5305\u62ec\u5185\u5b58\u3001\u786c\u76d8\u548c CPU \u7b49\uff09\u90fd\u5e94\u8be5\u5f97\u5230\u5145\u5206\u4fdd\u969c\u4ee5\u4fdd\u8bc1\u9ad8\u53ef\u7528\u3002\u4efb\u7531\u96c6\u7fa4\u7684\u81ea\u52a8\u53d8\u6362\u968f\u610f\u5730\u6539\u53d8\u6838\u5fc3\u8282\u70b9\uff0c\u65e0\u6cd5\u8ba9\u673a\u5668\u4fdd\u8bc1\u6027\u80fd\u3002\u6240\u4ee5 etcd \u5b98\u65b9\u9f13\u52b1\u5927\u5bb6\u5728\u5927\u578b\u96c6\u7fa4\u4e2d\u4e3a\u8fd0\u884c etcd \u51c6\u5907\u4e13\u6709\u673a\u5668\u96c6\u7fa4\u3002<\/li>\n<li>\u56e0\u4e3a etcd \u96c6\u7fa4\u662f\u652f\u6301\u9ad8\u53ef\u7528\u7684\uff0c\u90e8\u5206\u673a\u5668\u6545\u969c\u5e76\u4e0d\u4f1a\u5bfc\u81f4\u529f\u80fd\u5931\u6548\u3002\u6240\u4ee5\u673a\u5668\u53d1\u751f\u6545\u969c\u65f6\uff0c\u7ba1\u7406\u5458\u6709\u5145\u5206\u7684\u65f6\u95f4\u5bf9\u673a\u5668\u8fdb\u884c\u68c0\u67e5\u548c\u4fee\u590d\u3002<\/li>\n<li>\u81ea\u52a8\u8f6c\u6362\u4f7f\u5f97 etcd \u96c6\u7fa4\u53d8\u5f97\u590d\u6742\uff0c\u5c24\u5176\u662f\u5982\u4eca etcd \u652f\u6301\u591a\u79cd\u7f51\u7edc\u73af\u5883\u7684\u76d1\u542c\u548c\u4ea4\u4e92\u3002\u5728\u4e0d\u540c\u7f51\u7edc\u95f4\u8fdb\u884c\u8f6c\u6362\uff0c\u66f4\u5bb9\u6613\u53d1\u751f\u9519\u8bef\uff0c\u5bfc\u81f4\u96c6\u7fa4\u4e0d\u7a33\u5b9a\u3002<\/li>\n<\/ul>\n<p>\u57fa\u4e8e\u4e0a\u8ff0\u539f\u56e0\uff0c\u76ee\u524d Proxy \u6a21\u5f0f\u6709\u8f6c\u53d1\u4ee3\u7406\u529f\u80fd\uff0c\u800c\u4e0d\u4f1a\u8fdb\u884c\u89d2\u8272\u8f6c\u6362\u3002<\/p>\n<h4 id=\"heading26\" data-id-_6f657171d759=\"1\">5.2 \u5173\u952e\u90e8\u5206\u6e90\u7801\u89e3\u6790<\/h4>\n<p>\u4ece\u4ee3\u7801\u4e2d\u53ef\u4ee5\u770b\u5230\uff0cProxy \u6a21\u5f0f\u7684\u672c\u8d28\u5c31\u662f\u8d77\u4e00\u4e2a HTTP \u4ee3\u7406\u670d\u52a1\u5668\uff0c\u628a\u5ba2\u6237\u53d1\u5230\u8fd9\u4e2a\u670d\u52a1\u5668\u7684\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u522b\u7684 etcd \u8282\u70b9\u3002<\/p>\n<p>etcd \u76ee\u524d\u652f\u6301\u8bfb\u5199\u7686\u53ef\u548c\u53ea\u8bfb\u4e24\u79cd\u6a21\u5f0f\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u662f\u8bfb\u5199\u7686\u53ef\uff0c\u5c31\u662f\u628a\u8bfb\u3001\u5199\u4e24\u79cd\u8bf7\u6c42\u90fd\u8fdb\u884c\u8f6c\u53d1\u3002\u800c\u53ea\u8bfb\u6a21\u5f0f\u53ea\u8f6c\u53d1\u8bfb\u7684\u8bf7\u6c42\uff0c\u5bf9\u6240\u6709\u5176\u4ed6\u8bf7\u6c42\u8fd4\u56de 501 \u9519\u8bef\u3002<\/p>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u9664\u4e86\u542f\u52a8\u8fc7\u7a0b\u4e2d\u56e0\u4e3a\u8bbe\u7f6e\u4e86<code>proxy<\/code>\u53c2\u6570\u4f1a\u4f5c\u4e3a Proxy \u6a21\u5f0f\u542f\u52a8\u3002\u5728 etcd \u96c6\u7fa4\u5316\u542f\u52a8\u65f6\uff0c\u8282\u70b9\u6ce8\u518c\u81ea\u8eab\u7684\u65f6\u5019\u76d1\u6d4b\u5230\u96c6\u7fa4\u7684\u5b9e\u9645\u8282\u70b9\u6570\u91cf\u5df2\u7ecf\u7b26\u5408\u8981\u6c42\uff0c\u90a3\u4e48\u5c31\u4f1a\u9000\u5316\u4e3a Proxy \u6a21\u5f0f\u3002<\/p>\n<h3 id=\"heading27\" data-id-_f68e868bb486=\"1\">6 \u6570\u636e\u5b58\u50a8<\/h3>\n<p>etcd \u7684\u5b58\u50a8\u5206\u4e3a\u5185\u5b58\u5b58\u50a8\u548c\u6301\u4e45\u5316\uff08\u786c\u76d8\uff09\u5b58\u50a8\u4e24\u90e8\u5206\uff0c\u5185\u5b58\u4e2d\u7684\u5b58\u50a8\u9664\u4e86\u987a\u5e8f\u5316\u7684\u8bb0\u5f55\u4e0b\u6240\u6709\u7528\u6237\u5bf9\u8282\u70b9\u6570\u636e\u53d8\u66f4\u7684\u8bb0\u5f55\u5916\uff0c\u8fd8\u4f1a\u5bf9\u7528\u6237\u6570\u636e\u8fdb\u884c\u7d22\u5f15\u3001\u5efa\u5806\u7b49\u65b9\u4fbf\u67e5\u8be2\u7684\u64cd\u4f5c\u3002\u800c\u6301\u4e45\u5316\u5219\u4f7f\u7528\u9884\u5199\u5f0f\u65e5\u5fd7\uff08WAL\uff1aWrite Ahead Log\uff09\u8fdb\u884c\u8bb0\u5f55\u5b58\u50a8\u3002<\/p>\n<p>\u5728 WAL \u7684\u4f53\u7cfb\u4e2d\uff0c\u6240\u6709\u7684\u6570\u636e\u5728\u63d0\u4ea4\u4e4b\u524d\u90fd\u4f1a\u8fdb\u884c\u65e5\u5fd7\u8bb0\u5f55\u3002\u5728 etcd \u7684\u6301\u4e45\u5316\u5b58\u50a8\u76ee\u5f55\u4e2d\uff0c\u6709\u4e24\u4e2a\u5b50\u76ee\u5f55\u3002\u4e00\u4e2a\u662f WAL\uff0c\u5b58\u50a8\u7740\u6240\u6709\u4e8b\u52a1\u7684\u53d8\u5316\u8bb0\u5f55\uff1b\u53e6\u4e00\u4e2a\u5219\u662f snapshot\uff0c\u7528\u4e8e\u5b58\u50a8\u67d0\u4e00\u4e2a\u65f6\u523b etcd \u6240\u6709\u76ee\u5f55\u7684\u6570\u636e\u3002\u901a\u8fc7 WAL \u548c snapshot \u76f8\u7ed3\u5408\u7684\u65b9\u5f0f\uff0cetcd \u53ef\u4ee5\u6709\u6548\u7684\u8fdb\u884c\u6570\u636e\u5b58\u50a8\u548c\u8282\u70b9\u6545\u969c\u6062\u590d\u7b49\u64cd\u4f5c\u3002<\/p>\n<p>\u65e2\u7136\u6709\u4e86 WAL \u5b9e\u65f6\u5b58\u50a8\u4e86\u6240\u6709\u7684\u53d8\u66f4\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981 snapshot \u5462\uff1f\u968f\u7740\u4f7f\u7528\u91cf\u7684\u589e\u52a0\uff0cWAL \u5b58\u50a8\u7684\u6570\u636e\u4f1a\u66b4\u589e\uff0c\u4e3a\u4e86\u9632\u6b62\u78c1\u76d8\u5f88\u5feb\u5c31\u7206\u6ee1\uff0cetcd \u9ed8\u8ba4\u6bcf 10000 \u6761\u8bb0\u5f55\u505a\u4e00\u6b21 snapshot\uff0c\u7ecf\u8fc7 snapshot \u4ee5\u540e\u7684 WAL \u6587\u4ef6\u5c31\u53ef\u4ee5\u5220\u9664\u3002\u800c\u901a\u8fc7 API \u53ef\u4ee5\u67e5\u8be2\u7684\u5386\u53f2 etcd \u64cd\u4f5c\u9ed8\u8ba4\u4e3a 1000 \u6761\u3002<\/p>\n<p>\u9996\u6b21\u542f\u52a8\u65f6\uff0cetcd \u4f1a\u628a\u542f\u52a8\u7684\u914d\u7f6e\u4fe1\u606f\u5b58\u50a8\u5230<code>data-dir<\/code>\u53c2\u6570\u6307\u5b9a\u7684\u6570\u636e\u76ee\u5f55\u4e2d\u3002\u914d\u7f6e\u4fe1\u606f\u5305\u62ec\u672c\u5730\u8282\u70b9\u7684 ID\u3001\u96c6\u7fa4 ID \u548c\u521d\u59cb\u65f6\u96c6\u7fa4\u4fe1\u606f\u3002\u7528\u6237\u9700\u8981\u907f\u514d etcd \u4ece\u4e00\u4e2a\u8fc7\u671f\u7684\u6570\u636e\u76ee\u5f55\u4e2d\u91cd\u65b0\u542f\u52a8\uff0c\u56e0\u4e3a\u4f7f\u7528\u8fc7\u671f\u7684\u6570\u636e\u76ee\u5f55\u542f\u52a8\u7684\u8282\u70b9\u4f1a\u4e0e\u96c6\u7fa4\u4e2d\u7684\u5176\u4ed6\u8282\u70b9\u4ea7\u751f\u4e0d\u4e00\u81f4\uff08\u5982\uff1a\u4e4b\u524d\u5df2\u7ecf\u8bb0\u5f55\u5e76\u540c\u610f Leader \u8282\u70b9\u5b58\u50a8\u67d0\u4e2a\u4fe1\u606f\uff0c\u91cd\u542f\u540e\u53c8\u5411 Leader \u8282\u70b9\u7533\u8bf7\u8fd9\u4e2a\u4fe1\u606f\uff09\u3002\u6240\u4ee5\uff0c\u4e3a\u4e86\u6700\u5927\u5316\u96c6\u7fa4\u7684\u5b89\u5168\u6027\uff0c\u4e00\u65e6\u6709\u4efb\u4f55\u6570\u636e\u635f\u574f\u6216\u4e22\u5931\u7684\u53ef\u80fd\u6027\uff0c\u4f60\u5c31\u5e94\u8be5\u628a\u8fd9\u4e2a\u8282\u70b9\u4ece\u96c6\u7fa4\u4e2d\u79fb\u9664\uff0c\u7136\u540e\u52a0\u5165\u4e00\u4e2a\u4e0d\u5e26\u6570\u636e\u76ee\u5f55\u7684\u65b0\u8282\u70b9\u3002<\/p>\n<h4 id=\"heading28\" data-id-_200adbbaa315=\"1\">6.1 \u9884\u5199\u5f0f\u65e5\u5fd7\uff08WAL\uff09<\/h4>\n<p>WAL\uff08Write Ahead Log\uff09\u6700\u5927\u7684\u4f5c\u7528\u662f\u8bb0\u5f55\u4e86\u6574\u4e2a\u6570\u636e\u53d8\u5316\u7684\u5168\u90e8\u5386\u7a0b\u3002\u5728 etcd \u4e2d\uff0c\u6240\u6709\u6570\u636e\u7684\u4fee\u6539\u5728\u63d0\u4ea4\u524d\uff0c\u90fd\u8981\u5148\u5199\u5165\u5230 WAL \u4e2d\u3002\u4f7f\u7528 WAL \u8fdb\u884c\u6570\u636e\u7684\u5b58\u50a8\u4f7f\u5f97 etcd \u62e5\u6709\u4e24\u4e2a\u91cd\u8981\u529f\u80fd\u3002<\/p>\n<ul>\n<li><strong>\u6545\u969c\u5feb\u901f\u6062\u590d<\/strong>\uff1a \u5f53\u4f60\u7684\u6570\u636e\u906d\u5230\u7834\u574f\u65f6\uff0c\u5c31\u53ef\u4ee5\u901a\u8fc7\u6267\u884c\u6240\u6709 WAL \u4e2d\u8bb0\u5f55\u7684\u4fee\u6539\u64cd\u4f5c\uff0c\u5feb\u901f\u4ece\u6700\u539f\u59cb\u7684\u6570\u636e\u6062\u590d\u5230\u6570\u636e\u635f\u574f\u524d\u7684\u72b6\u6001\u3002<\/li>\n<li><strong>\u6570\u636e\u56de\u6eda\uff08undo\uff09\/ \u91cd\u505a\uff08redo\uff09<\/strong>\uff1a\u56e0\u4e3a\u6240\u6709\u7684\u4fee\u6539\u64cd\u4f5c\u90fd\u88ab\u8bb0\u5f55\u5728 WAL \u4e2d\uff0c\u9700\u8981\u56de\u6eda\u6216\u91cd\u505a\uff0c\u53ea\u9700\u8981\u65b9\u5411\u6216\u6b63\u5411\u6267\u884c\u65e5\u5fd7\u4e2d\u7684\u64cd\u4f5c\u5373\u53ef\u3002<\/li>\n<\/ul>\n<h4 id=\"heading29\" data-id-_017d735157fc=\"1\">WAL \u4e0e snapshot \u5728 etcd \u4e2d\u7684\u547d\u540d\u89c4\u5219<\/h4>\n<p>\u5728 etcd \u7684\u6570\u636e\u76ee\u5f55\u4e2d\uff0cWAL \u6587\u4ef6\u4ee5<code>$seq-$index.wal<\/code>\u7684\u683c\u5f0f\u5b58\u50a8\u3002\u6700\u521d\u59cb\u7684 WAL \u6587\u4ef6\u662f<code>0000000000000000-0000000000000000.wal<\/code>\uff0c\u8868\u793a\u662f\u6240\u6709 WAL \u6587\u4ef6\u4e2d\u7684\u7b2c 0 \u4e2a\uff0c\u521d\u59cb\u7684 Raft \u72b6\u6001\u7f16\u53f7\u4e3a 0\u3002\u8fd0\u884c\u4e00\u6bb5\u65f6\u95f4\u540e\u53ef\u80fd\u9700\u8981\u8fdb\u884c\u65e5\u5fd7\u5207\u5206\uff0c\u628a\u65b0\u7684\u6761\u76ee\u653e\u5230\u4e00\u4e2a\u65b0\u7684 WAL \u6587\u4ef6\u4e2d\u3002<\/p>\n<p>\u5047\u8bbe\uff0c\u5f53\u96c6\u7fa4\u8fd0\u884c\u5230 Raft \u72b6\u6001\u4e3a 20 \u65f6\uff0c\u9700\u8981\u8fdb\u884c WAL \u6587\u4ef6\u7684\u5207\u5206\u65f6\uff0c\u4e0b\u4e00\u4efd WAL \u6587\u4ef6\u5c31\u4f1a\u53d8\u4e3a<code>0000000000000001-0000000000000021.wal<\/code>\u3002\u5982\u679c\u5728 10 \u6b21\u64cd\u4f5c\u540e\u53c8\u8fdb\u884c\u4e86\u4e00\u6b21\u65e5\u5fd7\u5207\u5206\uff0c\u90a3\u4e48\u540e\u4e00\u6b21\u7684 WAL \u6587\u4ef6\u540d\u4f1a\u53d8\u4e3a<code>0000000000000002-0000000000000031.wal<\/code>\u3002\u53ef\u4ee5\u770b\u5230<code>-<\/code>\u7b26\u53f7\u524d\u9762\u7684\u6570\u5b57\u662f\u6bcf\u6b21\u5207\u5206\u540e\u81ea\u589e 1\uff0c\u800c<code>-<\/code>\u7b26\u53f7\u540e\u9762\u7684\u6570\u5b57\u5219\u662f\u6839\u636e\u5b9e\u9645\u5b58\u50a8\u7684 Raft \u8d77\u59cb\u72b6\u6001\u6765\u5b9a\u3002<\/p>\n<p>snapshot \u7684\u5b58\u50a8\u547d\u540d\u5219\u6bd4\u8f83\u5bb9\u6613\u7406\u89e3\uff0c\u4ee5<code>$term-$index.wal<\/code>\u683c\u5f0f\u8fdb\u884c\u547d\u540d\u5b58\u50a8\u3002term \u548c index \u5c31\u8868\u793a\u5b58\u50a8 snapshot \u65f6\u6570\u636e\u6240\u5728\u7684 raft \u8282\u70b9\u72b6\u6001\uff0c\u5f53\u524d\u7684\u4efb\u671f\u7f16\u53f7\u4ee5\u53ca\u6570\u636e\u9879\u4f4d\u7f6e\u4fe1\u606f\u3002<\/p>\n<h4 id=\"heading30\" data-id-_b7ceb835e35c=\"1\">6.2 \u5173\u952e\u90e8\u5206\u6e90\u7801\u89e3\u6790<\/h4>\n<p>\u4ece\u4ee3\u7801\u903b\u8f91\u4e2d\u53ef\u4ee5\u770b\u5230\uff0cWAL \u6709\u4e24\u79cd\u6a21\u5f0f\uff0c\u8bfb\u6a21\u5f0f\uff08read\uff09\u548c\u6570\u636e\u6dfb\u52a0\uff08append\uff09\u6a21\u5f0f\uff0c\u4e24\u79cd\u6a21\u5f0f\u4e0d\u80fd\u540c\u65f6\u6210\u7acb\u3002\u4e00\u4e2a\u65b0\u521b\u5efa\u7684 WAL \u6587\u4ef6\u5904\u4e8e append \u6a21\u5f0f\uff0c\u5e76\u4e14\u4e0d\u4f1a\u8fdb\u5165\u5230 read \u6a21\u5f0f\u3002\u4e00\u4e2a\u672c\u6765\u5b58\u5728\u7684 WAL \u6587\u4ef6\u88ab\u6253\u5f00\u7684\u65f6\u5019\u5fc5\u7136\u662f read \u6a21\u5f0f\uff0c\u5e76\u4e14\u53ea\u6709\u5728\u6240\u6709\u8bb0\u5f55\u90fd\u88ab\u8bfb\u5b8c\u7684\u65f6\u5019\uff0c\u624d\u80fd\u8fdb\u5165 append \u6a21\u5f0f\uff0c\u8fdb\u5165 append \u6a21\u5f0f\u540e\u4e5f\u4e0d\u4f1a\u518d\u8fdb\u5165 read \u6a21\u5f0f\u3002\u8fd9\u6837\u505a\u6709\u52a9\u4e8e\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u4e0e\u51c6\u786e\u3002<\/p>\n<p>\u96c6\u7fa4\u5728\u8fdb\u5165\u5230<code>etcdserver\/server.go<\/code>\u7684<code>NewServer<\/code>\u51fd\u6570\u51c6\u5907\u542f\u52a8\u4e00\u4e2a etcd \u8282\u70b9\u65f6\uff0c\u4f1a\u68c0\u6d4b\u662f\u5426\u5b58\u5728\u4ee5\u524d\u7684\u9057\u7559 WAL \u6570\u636e\u3002<\/p>\n<p>\u68c0\u6d4b\u7684\u7b2c\u4e00\u6b65\u662f\u67e5\u770b snapshot \u6587\u4ef6\u5939\u4e0b\u662f\u5426\u6709\u7b26\u5408\u89c4\u8303\u7684\u6587\u4ef6\uff0c\u82e5\u68c0\u6d4b\u5230 snapshot \u683c\u5f0f\u662f v0.4 \u7684\uff0c\u5219\u8c03\u7528\u51fd\u6570\u5347\u7ea7\u5230 v0.5\u3002\u4ece snapshot \u4e2d\u83b7\u5f97\u96c6\u7fa4\u7684\u914d\u7f6e\u4fe1\u606f\uff0c\u5305\u62ec token\u3001\u5176\u4ed6\u8282\u70b9\u7684\u4fe1\u606f\u7b49\u7b49\uff0c\u7136\u540e\u8f7d\u5165 WAL \u76ee\u5f55\u7684\u5185\u5bb9\uff0c\u4ece\u5c0f\u5230\u5927\u8fdb\u884c\u6392\u5e8f\u3002\u6839\u636e snapshot \u4e2d\u5f97\u5230\u7684 term \u548c index\uff0c\u627e\u5230 WAL \u7d27\u63a5\u7740 snapshot \u4e0b\u4e00\u6761\u7684\u8bb0\u5f55\uff0c\u7136\u540e\u5411\u540e\u66f4\u65b0\uff0c\u76f4\u5230\u6240\u6709 WAL \u5305\u7684 entry \u90fd\u5df2\u7ecf\u904d\u5386\u5b8c\u6bd5\uff0cEntry \u8bb0\u5f55\u5230 ents \u53d8\u91cf\u4e2d\u5b58\u50a8\u5728\u5185\u5b58\u91cc\u3002\u6b64\u65f6 WAL \u5c31\u8fdb\u5165 append \u6a21\u5f0f\uff0c\u4e3a\u6570\u636e\u9879\u6dfb\u52a0\u8fdb\u884c\u51c6\u5907\u3002<\/p>\n<p>\u5f53 WAL \u6587\u4ef6\u4e2d\u6570\u636e\u9879\u5185\u5bb9\u8fc7\u5927\u8fbe\u5230\u8bbe\u5b9a\u503c\uff08\u9ed8\u8ba4\u4e3a 10000\uff09\u65f6\uff0c\u4f1a\u8fdb\u884c WAL \u7684\u5207\u5206\uff0c\u540c\u65f6\u8fdb\u884c snapshot \u64cd\u4f5c\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u53ef\u4ee5\u5728<code>etcdserver\/server.go<\/code>\u7684<code>snapshot<\/code>\u51fd\u6570\u4e2d\u770b\u5230\u3002\u6240\u4ee5\uff0c\u5b9e\u9645\u4e0a\u6570\u636e\u76ee\u5f55\u4e2d\u6709\u7528\u7684 snapshot \u548c WAL \u6587\u4ef6\u5404\u53ea\u6709\u4e00\u4e2a\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b etcd \u4f1a\u5404\u4fdd\u7559 5 \u4e2a\u5386\u53f2\u6587\u4ef6\u3002<\/p>\n<h3 id=\"heading31\" data-id-_65249ec1dd54=\"1\">7 Raft<\/h3>\n<p>\u65b0\u7248 etcd \u4e2d\uff0craft \u5305\u5c31\u662f\u5bf9 Raft \u4e00\u81f4\u6027\u7b97\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\u3002\u5173\u4e8e Raft \u7b97\u6cd5\u7684\u8bb2\u89e3\uff0c\u7f51\u4e0a\u5df2\u7ecf\u6709\u5f88\u591a\u6587\u7ae0\uff0c\u6709\u5174\u8da3\u7684\u8bfb\u8005\u53ef\u4ee5\u53bb\u9605\u8bfb\u4e00\u4e0b<a href=\"https:\/\/ramcloud.stanford.edu\/raft.pdf\" target=\"_blank\" rel=\"noopener nofollow\">\u00a0Raft \u7b97\u6cd5\u8bba\u6587<\/a>\u975e\u5e38\u7cbe\u5f69\u3002\u672c\u6587\u5219\u4e0d\u518d\u5bf9 Raft \u7b97\u6cd5\u8fdb\u884c\u8be6\u7ec6\u63cf\u8ff0\uff0c\u800c\u662f\u7ed3\u5408 etcd\uff0c\u9488\u5bf9\u7b97\u6cd5\u4e2d\u4e00\u4e9b\u5173\u952e\u5185\u5bb9\u4ee5\u95ee\u7b54\u7684\u5f62\u5f0f\u8fdb\u884c\u8bb2\u89e3\u3002\u6709\u5173 Raft \u7b97\u6cd5\u7684\u672f\u8bed\u5982\u679c\u4e0d\u7406\u89e3\uff0c\u53ef\u4ee5\u53c2\u89c1\u6982\u5ff5\u8bcd\u6c47\u8868\u4e00\u8282\u3002<\/p>\n<h4 id=\"heading32\" data-id-_22745c1e6ff5=\"1\">7.1 Raft \u5e38\u89c1\u95ee\u7b54\u4e00\u89c8<\/h4>\n<ul>\n<li><strong>Raft \u4e2d\u4e00\u4e2a Term\uff08\u4efb\u671f\uff09\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/strong>\u00a0Raft \u7b97\u6cd5\u4e2d\uff0c\u4ece\u65f6\u95f4\u4e0a\uff0c\u4e00\u4e2a\u4efb\u671f\u8bb2\u5373\u4ece\u4e00\u6b21\u7ade\u9009\u5f00\u59cb\u5230\u4e0b\u4e00\u6b21\u7ade\u9009\u5f00\u59cb\u3002\u4ece\u529f\u80fd\u4e0a\u8bb2\uff0c\u5982\u679c Follower \u63a5\u6536\u4e0d\u5230 Leader \u8282\u70b9\u7684\u5fc3\u8df3\u4fe1\u606f\uff0c\u5c31\u4f1a\u7ed3\u675f\u5f53\u524d\u4efb\u671f\uff0c\u53d8\u4e3a Candidate \u53d1\u8d77\u7ade\u9009\uff0c\u6709\u52a9\u4e8e Leader \u8282\u70b9\u6545\u969c\u65f6\u96c6\u7fa4\u7684\u6062\u590d\u3002\u53d1\u8d77\u7ade\u9009\u6295\u7968\u65f6\uff0c\u4efb\u671f\u503c\u5c0f\u7684\u8282\u70b9\u4e0d\u4f1a\u7ade\u9009\u6210\u529f\u3002\u5982\u679c\u96c6\u7fa4\u4e0d\u51fa\u73b0\u6545\u969c\uff0c\u90a3\u4e48\u4e00\u4e2a\u4efb\u671f\u5c06\u65e0\u9650\u5ef6\u7eed\u4e0b\u53bb\u3002\u800c\u6295\u7968\u51fa\u73b0\u51b2\u7a81\u4e5f\u6709\u53ef\u80fd\u76f4\u63a5\u8fdb\u5165\u4e0b\u4e00\u4efb\u518d\u6b21\u7ade\u9009\u3002<img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/74\/e0\/740e703fb347a074addb3be1e10d33e0.jpg\" alt=\"\" \/>\n<p><strong>\u56fe 12 Term \u793a\u610f\u56fe<\/strong><\/li>\n<li><strong>Raft \u72b6\u6001\u673a\u662f\u600e\u6837\u5207\u6362\u7684\uff1f<\/strong>\u00a0Raft \u521a\u5f00\u59cb\u8fd0\u884c\u65f6\uff0c\u8282\u70b9\u9ed8\u8ba4\u8fdb\u5165 Follower \u72b6\u6001\uff0c\u7b49\u5f85 Leader \u53d1\u6765\u5fc3\u8df3\u4fe1\u606f\u3002\u82e5\u7b49\u5f85\u8d85\u65f6\uff0c\u5219\u72b6\u6001\u7531 Follower \u5207\u6362\u5230 Candidate \u8fdb\u5165\u4e0b\u4e00\u8f6e term \u53d1\u8d77\u7ade\u9009\uff0c\u7b49\u5230\u6536\u5230\u96c6\u7fa4\u591a\u6570\u8282\u70b9\u7684\u6295\u7968\u65f6\uff0c\u8be5\u8282\u70b9\u8f6c\u53d8\u4e3a Leader\u3002Leader \u8282\u70b9\u6709\u53ef\u80fd\u51fa\u73b0\u7f51\u7edc\u7b49\u6545\u969c\uff0c\u5bfc\u81f4\u522b\u7684\u8282\u70b9\u53d1\u8d77\u6295\u7968\u6210\u4e3a\u65b0 term \u7684 Leader\uff0c\u6b64\u65f6\u539f\u5148\u7684\u8001 Leader \u8282\u70b9\u4f1a\u5207\u6362\u4e3a Follower\u3002Candidate \u5728\u7b49\u5f85\u5176\u5b83\u8282\u70b9\u6295\u7968\u7684\u8fc7\u7a0b\u4e2d\u5982\u679c\u53d1\u73b0\u522b\u7684\u8282\u70b9\u5df2\u7ecf\u7ade\u9009\u6210\u529f\u6210\u4e3a Leader \u4e86\uff0c\u4e5f\u4f1a\u5207\u6362\u4e3a Follower \u8282\u70b9\u3002<img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/16\/3b\/167e2a4f72b05a18425e7ab3baf7a03b.jpg\" alt=\"\" \/>\n<p><strong>\u56fe 13 Raft \u72b6\u6001\u673a<\/strong><\/li>\n<li><strong>\u5982\u4f55\u4fdd\u8bc1\u6700\u77ed\u65f6\u95f4\u5185\u7ade\u9009\u51fa Leader\uff0c\u9632\u6b62\u7ade\u9009\u51b2\u7a81\uff1f<\/strong>\u00a0\u5728 Raft \u72b6\u6001\u673a\u4e00\u56fe\u4e2d\u53ef\u4ee5\u770b\u5230\uff0c\u5728 Candidate \u72b6\u6001\u4e0b\uff0c \u6709\u4e00\u4e2a times out\uff0c\u8fd9\u91cc\u7684 times out \u65f6\u95f4\u662f\u4e2a\u968f\u673a\u503c\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6bcf\u4e2a\u673a\u5668\u6210\u4e3a Candidate \u4ee5\u540e\uff0c\u8d85\u65f6\u53d1\u8d77\u65b0\u4e00\u8f6e\u7ade\u9009\u7684\u65f6\u95f4\u662f\u5404\u4e0d\u76f8\u540c\u7684\uff0c\u8fd9\u5c31\u4f1a\u51fa\u73b0\u4e00\u4e2a\u65f6\u95f4\u5dee\u3002\u5728\u65f6\u95f4\u5dee\u5185\uff0c\u5982\u679c Candidate1 \u6536\u5230\u7684\u7ade\u9009\u4fe1\u606f\u6bd4\u81ea\u5df1\u53d1\u8d77\u7684\u7ade\u9009\u4fe1\u606f term \u503c\u5927\uff08\u5373\u5bf9\u65b9\u4e3a\u65b0\u4e00\u8f6e term\uff09\uff0c\u5e76\u4e14\u65b0\u4e00\u8f6e\u60f3\u8981\u6210\u4e3a Leader \u7684 Candidate2 \u5305\u542b\u4e86\u6240\u6709\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u90a3\u4e48 Candidate1 \u5c31\u4f1a\u6295\u7968\u7ed9 Candidate2\u3002\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e86\u53ea\u6709\u5f88\u5c0f\u7684\u6982\u7387\u4f1a\u51fa\u73b0\u7ade\u9009\u51b2\u7a81\u3002<\/li>\n<li><strong>\u5982\u4f55\u9632\u6b62\u522b\u7684 Candidate \u5728\u9057\u6f0f\u90e8\u5206\u6570\u636e\u7684\u60c5\u51b5\u4e0b\u53d1\u8d77\u6295\u7968\u6210\u4e3a Leader\uff1f<\/strong>\u00a0Raft \u7ade\u9009\u7684\u673a\u5236\u4e2d\uff0c\u4f7f\u7528\u968f\u673a\u503c\u51b3\u5b9a\u8d85\u65f6\u65f6\u95f4\uff0c\u7b2c\u4e00\u4e2a\u8d85\u65f6\u7684\u8282\u70b9\u5c31\u4f1a\u63d0\u5347 term \u7f16\u53f7\u53d1\u8d77\u65b0\u4e00\u8f6e\u6295\u7968\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u522b\u7684\u8282\u70b9\u6536\u5230\u7ade\u9009\u901a\u77e5\u5c31\u4f1a\u6295\u7968\u3002\u4f46\u662f\uff0c\u5982\u679c\u53d1\u8d77\u7ade\u9009\u7684\u8282\u70b9\u5728\u4e0a\u4e00\u4e2a term \u4e2d\u4fdd\u5b58\u7684\u5df2\u63d0\u4ea4\u6570\u636e\u4e0d\u5b8c\u6574\uff0c\u8282\u70b9\u5c31\u4f1a\u62d2\u7edd\u6295\u7968\u7ed9\u5b83\u3002\u901a\u8fc7\u8fd9\u79cd\u673a\u5236\u5c31\u53ef\u4ee5\u9632\u6b62\u9057\u6f0f\u6570\u636e\u7684\u8282\u70b9\u6210\u4e3a Leader\u3002<\/li>\n<li><strong>Raft \u67d0\u4e2a\u8282\u70b9\u5b95\u673a\u540e\u4f1a\u5982\u4f55\uff1f<\/strong>\u00a0\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u662f Follower \u8282\u70b9\u5b95\u673a\uff0c\u5982\u679c\u5269\u4f59\u53ef\u7528\u8282\u70b9\u6570\u91cf\u8d85\u8fc7\u534a\u6570\uff0c\u96c6\u7fa4\u53ef\u4ee5\u51e0\u4e4e\u6ca1\u6709\u5f71\u54cd\u7684\u6b63\u5e38\u5de5\u4f5c\u3002\u5982\u679c\u662f Leader \u8282\u70b9\u5b95\u673a\uff0c\u90a3\u4e48 Follower \u5c31\u6536\u4e0d\u5230\u5fc3\u8df3\u800c\u8d85\u65f6\uff0c\u53d1\u8d77\u7ade\u9009\u83b7\u5f97\u6295\u7968\uff0c\u6210\u4e3a\u65b0\u4e00\u8f6e term \u7684 Leader\uff0c\u7ee7\u7eed\u4e3a\u96c6\u7fa4\u63d0\u4f9b\u670d\u52a1\u3002<strong>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1betcd \u76ee\u524d\u6ca1\u6709\u4efb\u4f55\u673a\u5236\u4f1a\u81ea\u52a8\u53bb\u53d8\u5316\u6574\u4e2a\u96c6\u7fa4\u603b\u5171\u7684\u8282\u70b9\u6570\u91cf<\/strong>\uff0c\u5373\u5982\u679c\u6ca1\u6709\u4eba\u4e3a\u7684\u8c03\u7528 API\uff0cetcd \u5b95\u673a\u540e\u7684\u8282\u70b9\u4ecd\u7136\u88ab\u8ba1\u7b97\u4e3a\u603b\u8282\u70b9\u6570\u4e2d\uff0c\u4efb\u4f55\u8bf7\u6c42\u88ab\u786e\u8ba4\u9700\u8981\u83b7\u5f97\u7684\u6295\u7968\u6570\u90fd\u662f\u8fd9\u4e2a\u603b\u6570\u7684\u534a\u6570\u4ee5\u4e0a\u3002<img decoding=\"async\" src=\"https:\/\/static001.infoq.cn\/resource\/image\/6c\/59\/6c0d225b6ab0cbb4a89afd4b12de0c59.jpg\" alt=\"\" \/>\n<p><strong>\u56fe 14 \u8282\u70b9\u5b95\u673a<\/strong><\/li>\n<li><strong>\u4e3a\u4ec0\u4e48 Raft \u7b97\u6cd5\u5728\u786e\u5b9a\u53ef\u7528\u8282\u70b9\u6570\u91cf\u65f6\u4e0d\u9700\u8981\u8003\u8651\u62dc\u5360\u5ead\u5c06\u519b\u95ee\u9898\uff1f<\/strong>\u00a0\u62dc\u5360\u5ead\u95ee\u9898\u4e2d\u63d0\u51fa\uff0c\u5141\u8bb8 n \u4e2a\u8282\u70b9\u5b95\u673a\u8fd8\u80fd\u63d0\u4f9b\u6b63\u5e38\u670d\u52a1\u7684\u5206\u5e03\u5f0f\u67b6\u6784\uff0c\u9700\u8981\u7684\u603b\u8282\u70b9\u6570\u91cf\u4e3a 3n+1\uff0c\u800c Raft \u53ea\u9700\u8981 2n+1 \u5c31\u53ef\u4ee5\u4e86\u3002\u5176\u4e3b\u8981\u539f\u56e0\u5728\u4e8e\uff0c\u62dc\u5360\u5ead\u5c06\u519b\u95ee\u9898\u4e2d\u5b58\u5728\u6570\u636e\u6b3a\u9a97\u7684\u73b0\u8c61\uff0c\u800c etcd \u4e2d\u5047\u8bbe\u6240\u6709\u7684\u8282\u70b9\u90fd\u662f\u8bda\u5b9e\u7684\u3002etcd \u5728\u7ade\u9009\u524d\u9700\u8981\u544a\u8bc9\u522b\u7684\u8282\u70b9\u81ea\u8eab\u7684 term \u7f16\u53f7\u4ee5\u53ca\u524d\u4e00\u8f6e term \u6700\u7ec8\u7ed3\u675f\u65f6\u7684 index \u503c\uff0c\u8fd9\u4e9b\u6570\u636e\u90fd\u662f\u51c6\u786e\u7684\uff0c\u5176\u4ed6\u8282\u70b9\u53ef\u4ee5\u6839\u636e\u8fd9\u4e9b\u503c\u51b3\u5b9a\u662f\u5426\u6295\u7968\u3002\u53e6\u5916\uff0cetcd \u4e25\u683c\u9650\u5236 Leader \u5230 Follower \u8fd9\u6837\u7684\u6570\u636e\u6d41\u5411\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u4e0d\u4f1a\u51fa\u9519\u3002<\/li>\n<li><strong>\u7528\u6237\u4ece\u96c6\u7fa4\u4e2d\u54ea\u4e2a\u8282\u70b9\u8bfb\u5199\u6570\u636e\uff1f<\/strong>\u00a0Raft \u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u7684\u5f3a\u4e00\u81f4\u6027\uff0c\u6240\u6709\u7684\u6570\u636e\u6d41\u5411\u90fd\u662f\u4e00\u4e2a\u65b9\u5411\uff0c\u4ece Leader \u6d41\u5411 Follower\uff0c\u4e5f\u5c31\u662f\u6240\u6709 Follower \u7684\u6570\u636e\u5fc5\u987b\u4e0e Leader \u4fdd\u6301\u4e00\u81f4\uff0c\u5982\u679c\u4e0d\u4e00\u81f4\u4f1a\u88ab\u8986\u76d6\u3002\u5373\u6240\u6709\u7528\u6237\u66f4\u65b0\u6570\u636e\u7684\u8bf7\u6c42\u90fd\u6700\u5148\u7531 Leader \u83b7\u5f97\uff0c\u7136\u540e\u5b58\u4e0b\u6765\u901a\u77e5\u5176\u4ed6\u8282\u70b9\u4e5f\u5b58\u4e0b\u6765\uff0c\u7b49\u5230\u5927\u591a\u6570\u8282\u70b9\u53cd\u9988\u65f6\u518d\u628a\u6570\u636e\u63d0\u4ea4\u3002\u4e00\u4e2a\u5df2\u63d0\u4ea4\u7684\u6570\u636e\u9879\u624d\u662f Raft \u771f\u6b63\u7a33\u5b9a\u5b58\u50a8\u4e0b\u6765\u7684\u6570\u636e\u9879\uff0c\u4e0d\u518d\u88ab\u4fee\u6539\uff0c\u6700\u540e\u518d\u628a\u63d0\u4ea4\u7684\u6570\u636e\u540c\u6b65\u7ed9\u5176\u4ed6 Follower\u3002\u56e0\u4e3a\u6bcf\u4e2a\u8282\u70b9\u90fd\u6709 Raft \u5df2\u63d0\u4ea4\u6570\u636e\u51c6\u786e\u7684\u5907\u4efd\uff08\u6700\u574f\u7684\u60c5\u51b5\u4e5f\u53ea\u662f\u5df2\u63d0\u4ea4\u6570\u636e\u8fd8\u672a\u5b8c\u5168\u540c\u6b65\uff09\uff0c\u6240\u4ee5\u8bfb\u7684\u8bf7\u6c42\u4efb\u610f\u4e00\u4e2a\u8282\u70b9\u90fd\u53ef\u4ee5\u5904\u7406\u3002<\/li>\n<li><strong>etcd \u5b9e\u73b0\u7684 Raft \u7b97\u6cd5\u6027\u80fd\u5982\u4f55\uff1f<\/strong>\u00a0\u5355\u5b9e\u4f8b\u8282\u70b9\u652f\u6301\u6bcf\u79d2 1000 \u6b21\u6570\u636e\u5199\u5165\u3002\u8282\u70b9\u8d8a\u591a\uff0c\u7531\u4e8e\u6570\u636e\u540c\u6b65\u6d89\u53ca\u5230\u7f51\u7edc\u5ef6\u8fdf\uff0c\u4f1a\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u8d8a\u6765\u8d8a\u6162\uff0c\u800c\u8bfb\u6027\u80fd\u4f1a\u968f\u4e4b\u53d8\u5f3a\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u8282\u70b9\u90fd\u80fd\u5904\u7406\u7528\u6237\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n<h4 id=\"heading33\" data-id-_203bd507102e=\"1\">7.2 \u5173\u952e\u90e8\u5206\u6e90\u7801\u89e3\u6790<\/h4>\n<p>\u5728 etcd \u4ee3\u7801\u4e2d\uff0cNode \u4f5c\u4e3a Raft \u72b6\u6001\u673a\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u662f\u6574\u4e2a\u7b97\u6cd5\u7684\u5173\u952e\uff0c\u4e5f\u662f\u4e86\u89e3\u7b97\u6cd5\u7684\u5165\u53e3\u3002<\/p>\n<p>\u5728 etcd \u4e2d\uff0c\u5bf9 Raft \u7b97\u6cd5\u7684\u8c03\u7528\u5982\u4e0b\uff0c\u4f60\u53ef\u4ee5\u5728<code>etcdserver\/raft.go<\/code>\u4e2d\u7684<code>startNode<\/code>\u627e\u5230\uff1a<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs angelscript\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">storage := raft.NewMemoryStorage()<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">n := raft.StartNode(<span class=\"hljs-number\">0x01<\/span>, []<span class=\"hljs-built_in\">int<\/span>64{<span class=\"hljs-number\">0x02<\/span>, <span class=\"hljs-number\">0x03<\/span>}, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">1<\/span>, storage)<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs angelscript\"><\/code><\/pre>\n<p>\u901a\u8fc7\u8fd9\u6bb5\u4ee3\u7801\u53ef\u4ee5\u4e86\u89e3\u5230\uff0cRaft \u5728\u8fd0\u884c\u8fc7\u7a0b\u8bb0\u5f55\u6570\u636e\u548c\u72b6\u6001\u90fd\u662f\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u800c\u4ee3\u7801\u4e2d<code>raft.StartNode<\/code>\u542f\u52a8\u7684 Node \u5c31\u662f Raft \u72b6\u6001\u673a Node\u3002\u542f\u52a8\u4e86\u4e00\u4e2a Node \u8282\u70b9\u540e\uff0cRaft \u4f1a\u505a\u5982\u4e0b\u4e8b\u9879\u3002<\/p>\n<p>\u9996\u5148\uff0c\u4f60\u9700\u8981\u628a\u4ece\u96c6\u7fa4\u7684\u5176\u4ed6\u673a\u5668\u4e0a\u6536\u5230\u7684\u4fe1\u606f\u63a8\u9001\u5230 Node \u8282\u70b9\uff0c\u4f60\u53ef\u4ee5\u5728<code>etcdserver\/server.go<\/code>\u4e2d\u7684<code>Process<\/code>\u51fd\u6570\u770b\u5230\u3002<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs reasonml\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">func (s *EtcdServer) <span class=\"hljs-constructor\">Process(<span class=\"hljs-params\">ctx<\/span> <span class=\"hljs-params\">context<\/span>.Context, <span class=\"hljs-params\">m<\/span> <span class=\"hljs-params\">raftpb<\/span>.Message)<\/span> error {<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-keyword\">if<\/span> m.Type<span class=\"hljs-operator\"> == <\/span>raftpb.MsgApp {<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">s.stats.<span class=\"hljs-constructor\">RecvAppendReq(<span class=\"hljs-params\">types<\/span>.ID(<span class=\"hljs-params\">m<\/span>.From)<\/span>.<span class=\"hljs-constructor\">String()<\/span>, m.<span class=\"hljs-constructor\">Size()<\/span>)<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">}<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"6\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">return s.node.<span class=\"hljs-constructor\">Step(<span class=\"hljs-params\">ctx<\/span>, <span class=\"hljs-params\">m<\/span>)<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"7\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">}<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs reasonml\"><\/code><\/pre>\n<p>\u5728\u68c0\u6d4b\u53d1\u6765\u8bf7\u6c42\u7684\u673a\u5668\u662f\u5426\u662f\u96c6\u7fa4\u4e2d\u7684\u8282\u70b9\uff0c\u81ea\u8eab\u8282\u70b9\u662f\u5426\u662f Follower\uff0c\u628a\u53d1\u6765\u8bf7\u6c42\u7684\u673a\u5668\u4f5c\u4e3a Leader\uff0c\u5177\u4f53\u5bf9 Node \u8282\u70b9\u4fe1\u606f\u7684\u63a8\u9001\u548c\u5904\u7406\u5219\u901a\u8fc7<code>node.Step()<\/code>\u51fd\u6570\u5b9e\u73b0\u3002<\/p>\n<p>\u5176\u6b21\uff0c\u4f60\u9700\u8981\u628a\u65e5\u5fd7\u9879\u5b58\u50a8\u8d77\u6765\uff0c\u5728\u4f60\u7684\u5e94\u7528\u4e2d\u6267\u884c\u63d0\u4ea4\u7684\u65e5\u5fd7\u9879\uff0c\u7136\u540e\u628a\u5b8c\u6210\u4fe1\u53f7\u53d1\u9001\u7ed9\u96c6\u7fa4\u4e2d\u7684\u5176\u5b83\u8282\u70b9\uff0c\u518d\u901a\u8fc7<code>node.Ready()<\/code>\u76d1\u542c\u7b49\u5f85\u4e0b\u4e00\u6b21\u4efb\u52a1\u6267\u884c\u3002\u6709\u4e00\u70b9\u975e\u5e38\u91cd\u8981\uff0c\u4f60\u5fc5\u987b\u786e\u4fdd\u5728\u4f60\u53d1\u9001\u5b8c\u6210\u6d88\u606f\u7ed9\u5176\u4ed6\u8282\u70b9\u4e4b\u524d\uff0c\u4f60\u7684\u65e5\u5fd7\u9879\u5185\u5bb9\u5df2\u7ecf\u786e\u5207\u7a33\u5b9a\u7684\u5b58\u50a8\u4e0b\u6765\u4e86\u3002<\/p>\n<p>\u6700\u540e\uff0c\u4f60\u9700\u8981\u4fdd\u6301\u4e00\u4e2a\u5fc3\u8df3\u4fe1\u53f7<code>Tick()<\/code>\u3002Raft \u6709\u4e24\u4e2a\u5f88\u91cd\u8981\u7684\u5730\u65b9\u7528\u5230\u8d85\u65f6\u673a\u5236\uff1a\u5fc3\u8df3\u4fdd\u6301\u548c Leader \u7ade\u9009\u3002\u9700\u8981\u7528\u6237\u5728\u5176 raft \u7684 Node \u8282\u70b9\u4e0a\u5468\u671f\u6027\u7684\u8c03\u7528 Tick() \u51fd\u6570\uff0c\u4ee5\u4fbf\u4e3a\u8d85\u65f6\u673a\u5236\u670d\u52a1\u3002<\/p>\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0c\u6574\u4e2a raft \u8282\u70b9\u7684\u72b6\u6001\u673a\u5faa\u73af\u7c7b\u4f3c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs roboconf\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">for {<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-attribute\">select {<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-attribute\"> case &lt;-s.Ticker<\/span>:<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">n<span class=\"hljs-variable\">.Tick<\/span>()<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"6\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">case rd := &lt;-s<span class=\"hljs-variable\">.Node<\/span><span class=\"hljs-variable\">.Ready<\/span>():<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"7\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">saveToStorage(rd<span class=\"hljs-variable\">.State<\/span>, rd<span class=\"hljs-variable\">.Entries<\/span>)<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"8\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">send(rd<span class=\"hljs-variable\">.Messages<\/span>)<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"9\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">process(rd<span class=\"hljs-variable\">.CommittedEntries<\/span>)<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"10\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">s<span class=\"hljs-variable\">.Node<\/span><span class=\"hljs-variable\">.Advance<\/span>()<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"11\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">case &lt;-s<span class=\"hljs-variable\">.done<\/span>:<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"12\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">return<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"13\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">}<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"14\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">}<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs roboconf\"><\/code><\/pre>\n<p>\u800c\u8fd9\u4e2a\u72b6\u6001\u673a\u771f\u5b9e\u5b58\u5728\u7684\u4ee3\u7801\u4f4d\u7f6e\u4e3a<code>etcdserver\/server.go<\/code>\u4e2d\u7684<code>run<\/code>\u51fd\u6570\u3002<\/p>\n<p>\u5bf9\u72b6\u6001\u673a\u8fdb\u884c\u72b6\u6001\u53d8\u66f4\uff08\u5982\u7528\u6237\u6570\u636e\u66f4\u65b0\u7b49\uff09\u5219\u662f\u8c03\u7528<code>n.Propose(ctx, data)<\/code>\u51fd\u6570\uff0c\u5728\u5b58\u50a8\u6570\u636e\u65f6\uff0c\u4f1a\u5148\u8fdb\u884c\u5e8f\u5217\u5316\u64cd\u4f5c\u3002\u83b7\u5f97\u5927\u591a\u6570\u5176\u4ed6\u8282\u70b9\u7684\u786e\u8ba4\u540e\uff0c\u6570\u636e\u4f1a\u88ab\u63d0\u4ea4\uff0c\u5b58\u4e3a\u5df2\u63d0\u4ea4\u72b6\u6001\u3002<\/p>\n<p>\u4e4b\u524d\u63d0\u5230 etcd \u96c6\u7fa4\u7684\u542f\u52a8\u9700\u8981\u501f\u52a9\u522b\u7684 etcd \u96c6\u7fa4\u6216\u8005 DNS\uff0c\u800c\u542f\u52a8\u5b8c\u6bd5\u540e\u8fd9\u4e9b<code>\u5916\u529b<\/code>\u5c31\u4e0d\u9700\u8981\u4e86\uff0cetcd \u4f1a\u628a\u81ea\u8eab\u96c6\u7fa4\u7684\u4fe1\u606f\u4f5c\u4e3a\u72b6\u6001\u5b58\u50a8\u8d77\u6765\u3002\u6240\u4ee5\u8981\u53d8\u66f4\u81ea\u8eab\u96c6\u7fa4\u8282\u70b9\u6570\u91cf\u5b9e\u9645\u4e0a\u4e5f\u9700\u8981\u50cf\u7528\u6237\u6570\u636e\u53d8\u66f4\u90a3\u6837\u6dfb\u52a0\u6570\u636e\u6761\u76ee\u5230 Raft \u72b6\u6001\u673a\u4e2d\u3002\u8fd9\u4e00\u5207\u7531<code>n.ProposeConfChange(ctx, cc)<\/code>\u5b9e\u73b0\u3002\u5f53\u96c6\u7fa4\u914d\u7f6e\u4fe1\u606f\u53d8\u66f4\u7684\u8bf7\u6c42\u540c\u6837\u5f97\u5230\u5927\u591a\u6570\u8282\u70b9\u7684\u786e\u8ba4\u53cd\u9988\u540e\uff0c\u518d\u8fdb\u884c\u914d\u7f6e\u53d8\u66f4\u7684\u6b63\u5f0f\u64cd\u4f5c\uff0c\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs reasonml\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">var cc raftpb.ConfChange<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">cc.<span class=\"hljs-constructor\">Unmarshal(<span class=\"hljs-params\">data<\/span>)<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">n.<span class=\"hljs-constructor\">ApplyConfChange(<span class=\"hljs-params\">cc<\/span>)<\/span><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs reasonml\"><\/code><\/pre>\n<p>\u6ce8\u610f\uff1a\u4e00\u4e2a ID \u552f\u4e00\u6027\u7684\u8868\u793a\u4e86\u4e00\u4e2a\u96c6\u7fa4\uff0c\u6240\u4ee5\u4e3a\u4e86\u907f\u514d\u4e0d\u540c etcd \u96c6\u7fa4\u6d88\u606f\u6df7\u4e71\uff0cID \u9700\u8981\u786e\u4fdd\u552f\u4e00\u6027\uff0c\u4e0d\u80fd\u91cd\u590d\u4f7f\u7528\u65e7\u7684 token \u6570\u636e\u4f5c\u4e3a ID\u3002<\/p>\n<h3 id=\"heading34\" data-id-_e802983297ba=\"1\">8 Store<\/h3>\n<p>Store \u8fd9\u4e2a\u6a21\u5757\u987e\u540d\u601d\u4e49\uff0c\u5c31\u50cf\u4e00\u4e2a\u5546\u5e97\u628a etcd \u5df2\u7ecf\u51c6\u5907\u597d\u7684\u5404\u9879\u5e95\u5c42\u652f\u6301\u52a0\u5de5\u8d77\u6765\uff0c\u4e3a\u7528\u6237\u63d0\u4f9b\u4e94\u82b1\u516b\u95e8\u7684 API \u652f\u6301\uff0c\u5904\u7406\u7528\u6237\u7684\u5404\u9879\u8bf7\u6c42\u3002\u8981\u7406\u89e3 Store\uff0c\u53ea\u9700\u8981\u4ece etcd \u7684 API \u5165\u624b\u5373\u53ef\u3002\u6253\u5f00<a href=\"https:\/\/github.com\/coreos\/etcd\/blob\/master\/Documentation\/api.md\" target=\"_blank\" rel=\"noopener nofollow\">\u00a0etcd \u7684 API \u5217\u8868<\/a>\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6709\u5982\u4e0b API \u662f\u5bf9 etcd \u5b58\u50a8\u7684\u952e\u503c\u8fdb\u884c\u7684\u64cd\u4f5c\uff0c\u4ea6\u5373 Store \u63d0\u4f9b\u7684\u5185\u5bb9\u3002API \u4e2d\u63d0\u5230\u7684\u76ee\u5f55\uff08Directory\uff09\u548c\u952e\uff08Key\uff09\uff0c\u4e0a\u6587\u4e2d\u4e5f\u53ef\u80fd\u79f0\u4e3a etcd \u8282\u70b9\uff08Node\uff09\u3002<\/p>\n<ul>\n<li>\u4e3a etcd \u5b58\u50a8\u7684\u952e\u8d4b\u503c &#8220;`\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/message\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/message\u00a0<\/a>-XPUT -d value=\u201cHello world\u201d<br \/>\n{<br \/>\n\u201caction\u201d: \u201cset\u201d,<br \/>\n\u201cnode\u201d: {<br \/>\n\u201ccreatedIndex\u201d: 2,<br \/>\n\u201ckey\u201d: \u201c\/message\u201d,<br \/>\n\u201cmodifiedIndex\u201d: 2,<br \/>\n\u201cvalue\u201d: \u201cHello world\u201d<br \/>\n}<br \/>\n}<\/li>\n<\/ul>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs xquery\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u53cd\u9988\u7684\u5185\u5bb9\u542b\u4e49\u5982\u4e0b\uff1a<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; action: \u521a\u521a\u8fdb\u884c\u7684\u52a8\u4f5c\u540d\u79f0\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; <span class=\"hljs-type\">node<\/span><span class=\"hljs-built_in\">.key<\/span>: \u8bf7\u6c42\u7684 HTTP \u8def\u5f84\u3002etcd \u4f7f\u7528\u4e00\u4e2a\u7c7b\u4f3c\u6587\u4ef6\u7cfb\u7edf\u7684\u65b9\u5f0f\u6765\u53cd\u6620\u952e\u503c\u5b58\u50a8\u7684\u5185\u5bb9\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"6\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; <span class=\"hljs-type\">node<\/span>.value: \u521a\u521a\u8bf7\u6c42\u7684\u952e\u6240\u5b58\u50a8\u7684\u5185\u5bb9\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"7\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; <span class=\"hljs-type\">node<\/span>.createdIndex: etcd \u8282\u70b9\u6bcf\u6b21\u6709\u53d8\u5316\u65f6\u90fd\u4f1a\u81ea\u589e\u7684\u4e00\u4e2a\u503c\uff0c\u9664\u4e86\u7528\u6237\u8bf7\u6c42\u5916\uff0cetcd \u5185\u90e8\u8fd0\u884c\uff08\u5982\u542f\u52a8\u3001\u96c6\u7fa4\u4fe1\u606f\u53d8\u5316\u7b49\uff09\u4e5f\u4f1a\u5bf9\u8282\u70b9\u6709\u53d8\u52a8\u800c\u5f15\u8d77\u8fd9\u4e2a\u503c\u7684\u53d8\u5316\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"8\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; <span class=\"hljs-type\">node<\/span>.modifiedIndex: \u7c7b\u4f3c <span class=\"hljs-type\">node<\/span>.createdIndex\uff0c\u80fd\u5f15\u8d77 modifiedIndex \u53d8\u5316\u7684\u64cd\u4f5c\u5305\u62ec set, <span class=\"hljs-keyword\">delete<\/span>, <span class=\"hljs-keyword\">update<\/span>, create, compareAndSwap <span class=\"hljs-keyword\">and<\/span> compareAndDelete\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"9\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; \u67e5\u8be2 etcd \u67d0\u4e2a\u952e\u5b58\u50a8\u7684\u503c &#8220;`<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"10\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"11\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">curl http:\/\/<span class=\"hljs-number\">127.0<\/span>.<span class=\"hljs-number\">0<\/span>.<span class=\"hljs-number\">1<\/span>:<span class=\"hljs-number\">2379<\/span>\/v2\/keys\/message<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs xquery\"><\/code><\/pre>\n<ul>\n<li>\u4fee\u6539\u952e\u503c\uff1a\u4e0e\u521b\u5efa\u65b0\u503c\u51e0\u4e4e\u76f8\u540c\uff0c\u4f46\u662f\u53cd\u9988\u65f6\u4f1a\u6709\u4e00\u4e2a<code>prevNode<\/code>\u503c\u53cd\u5e94\u4e86\u4fee\u6539\u524d\u5b58\u50a8\u7684\u5185\u5bb9\u3002 &#8220;`\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/message\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/message\u00a0<\/a>-XPUT -d value=\u201cHello etcd\u201d<\/li>\n<\/ul>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; \u5220\u9664\u4e00\u4e2a\u503c &#8220;`<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">curl http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">127.0<\/span>.<span class=\"hljs-number\">0.1<\/span>:<span class=\"hljs-number\">2379<\/span><span class=\"hljs-regexp\">\/v2\/<\/span>keys\/message -XDELETE<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<ul>\n<li>\u5bf9\u4e00\u4e2a\u952e\u8fdb\u884c\u5b9a\u65f6\u5220\u9664\uff1aetcd \u4e2d\u5bf9\u952e\u8fdb\u884c\u5b9a\u65f6\u5220\u9664\uff0c\u8bbe\u5b9a\u4e00\u4e2a TTL \u503c\uff0c\u5f53\u8fd9\u4e2a\u503c\u5230\u671f\u65f6\u952e\u5c31\u4f1a\u88ab\u5220\u9664\u3002\u53cd\u9988\u7684\u5185\u5bb9\u4f1a\u7ed9\u51fa expiration \u9879\u544a\u77e5\u8d85\u65f6\u65f6\u95f4\uff0cttl \u9879\u544a\u77e5\u8bbe\u5b9a\u7684\u65f6\u957f\u3002 &#8220;`\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/foo\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/foo\u00a0<\/a>-XPUT -d value=bar -d ttl=5<\/li>\n<\/ul>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; \u53d6\u6d88\u5b9a\u65f6\u5220\u9664\u4efb\u52a1 &#8220;`<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">curl http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">127.0<\/span>.<span class=\"hljs-number\">0.1<\/span>:<span class=\"hljs-number\">2379<\/span><span class=\"hljs-regexp\">\/v2\/<\/span>keys\/foo -XPUT -d value=bar -d ttl= -d prevExist=true<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<ul>\n<li>\u5bf9\u952e\u503c\u4fee\u6539\u8fdb\u884c\u76d1\u63a7\uff1aetcd \u63d0\u4f9b\u7684\u8fd9\u4e2a API \u8ba9\u7528\u6237\u53ef\u4ee5\u76d1\u63a7\u4e00\u4e2a\u503c\u6216\u8005\u9012\u5f52\u5f0f\u7684\u76d1\u63a7\u4e00\u4e2a\u76ee\u5f55\u53ca\u5176\u5b50\u76ee\u5f55\u7684\u503c\uff0c\u5f53\u76ee\u5f55\u6216\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0cetcd \u4f1a\u4e3b\u52a8\u901a\u77e5\u3002 &#8220;`\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/foo?wait=true\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/foo?wait=true<\/a><\/li>\n<\/ul>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs autohotkey\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; \u5bf9\u8fc7\u53bb\u7684\u952e\u503c\u64cd\u4f5c\u8fdb\u884c\u67e5\u8be2\uff1a\u7c7b\u4f3c\u4e0a\u9762\u63d0\u5230\u7684\u76d1\u63a7\uff0c\u53ea\u4e0d\u8fc7\u76d1\u63a7\u65f6\u52a0\u4e0a\u4e86\u8fc7\u53bb\u67d0\u6b21\u4fee\u6539\u7684\u7d22\u5f15\u7f16\u53f7\uff0c\u5c31\u53ef\u4ee5\u67e5\u8be2\u5386\u53f2\u64cd\u4f5c\u3002\u9ed8\u8ba4\u53ef\u67e5\u8be2\u7684\u5386\u53f2\u8bb0\u5f55\u4e3a <span class=\"hljs-number\">1000<\/span> \u6761\u3002 &#8220;`<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-title\"> curl &#8216;http:\/\/127.0.0.1:<\/span><span class=\"hljs-number\">2379<\/span>\/v2\/keys\/foo?wait=<span class=\"hljs-literal\">true<\/span>&amp;waitIndex=<span class=\"hljs-number\">7<\/span>&#8216;<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs autohotkey\"><\/code><\/pre>\n<ul>\n<li>\u81ea\u52a8\u5728\u76ee\u5f55\u4e0b\u521b\u5efa\u6709\u5e8f\u952e\u3002\u5728\u5bf9\u521b\u5efa\u7684\u76ee\u5f55\u4f7f\u7528<code>POST<\/code>\u53c2\u6570\uff0c\u4f1a\u81ea\u52a8\u5728\u8be5\u76ee\u5f55\u4e0b\u521b\u5efa\u4e00\u4e2a\u4ee5 createdIndex \u503c\u4e3a\u952e\u7684\u503c\uff0c\u8fd9\u6837\u5c31\u76f8\u5f53\u4e8e\u4ee5\u521b\u5efa\u65f6\u95f4\u5148\u540e\u4e25\u683c\u6392\u5e8f\u4e86\u3002\u8fd9\u4e2a API \u5bf9\u5206\u5e03\u5f0f\u961f\u5217\u8fd9\u7c7b\u573a\u666f\u975e\u5e38\u6709\u7528\u3002 &#8220;`\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/queue\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/queue\u00a0<\/a>-XPOST -d value=Job1<br \/>\n{<br \/>\n\u201caction\u201d: \u201ccreate\u201d,<br \/>\n\u201cnode\u201d: {<br \/>\n\u201ccreatedIndex\u201d: 6,<br \/>\n\u201ckey\u201d: \u201c\/queue\/6\u201d,<br \/>\n\u201cmodifiedIndex\u201d: 6,<br \/>\n\u201cvalue\u201d: \u201cJob1\u201d<br \/>\n}<br \/>\n}<\/li>\n<\/ul>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs autohotkey\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; \u6309\u987a\u5e8f\u5217\u51fa\u6240\u6709\u521b\u5efa\u7684\u6709\u5e8f\u952e\u3002 &#8220;`<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-title\"> curl -s &#8216;http:\/\/127.0.0.1:<\/span><span class=\"hljs-number\">2379<\/span>\/v2\/keys\/queue?recursive=<span class=\"hljs-literal\">true<\/span>&amp;sorted=<span class=\"hljs-literal\">true<\/span>&#8216;<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs autohotkey\"><\/code><\/pre>\n<ul>\n<li>\u521b\u5efa\u5b9a\u65f6\u5220\u9664\u7684\u76ee\u5f55\uff1a\u5c31\u8ddf\u5b9a\u65f6\u5220\u9664\u67d0\u4e2a\u952e\u7c7b\u4f3c\u3002\u5982\u679c\u76ee\u5f55\u56e0\u4e3a\u8d85\u65f6\u88ab\u5220\u9664\u4e86\uff0c\u5176\u4e0b\u7684\u6240\u6709\u5185\u5bb9\u4e5f\u81ea\u52a8\u8d85\u65f6\u5220\u9664\u3002 &#8220;`\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/dir\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/dir\u00a0<\/a>-XPUT -d ttl=30 -d dir=true<\/li>\n<\/ul>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u5237\u65b0\u8d85\u65f6\u65f6\u95f4\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs\"><\/code><\/pre>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">curl http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">127.0<\/span>.<span class=\"hljs-number\">0.1<\/span>:<span class=\"hljs-number\">2379<\/span><span class=\"hljs-regexp\">\/v2\/<\/span>keys\/dir -XPUT -d ttl=<span class=\"hljs-number\">30<\/span> -d dir=true -d prevExist=true<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs markdown\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">&#8211;<\/span> \u81ea\u52a8\u5316 CAS\uff08Compare-and-Swap\uff09\u64cd\u4f5c\uff1aetcd \u5f3a\u4e00\u81f4\u6027\u6700\u76f4\u89c2\u7684\u8868\u73b0\u5c31\u662f\u8fd9\u4e2a API\uff0c\u901a\u8fc7\u8bbe\u5b9a\u6761\u4ef6\uff0c\u963b\u6b62\u8282\u70b9\u4e8c\u6b21\u521b\u5efa\u6216\u4fee\u6539\u3002\u5373\u7528\u6237\u7684\u6307\u4ee4\u88ab\u6267\u884c\u5f53\u4e14\u4ec5\u5f53 CAS \u7684\u6761\u4ef6\u6210\u7acb\u3002\u6761\u4ef6\u6709\u4ee5\u4e0b\u51e0\u4e2a\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\"> &#8211;<\/span> prevValue \u5148\u524d\u8282\u70b9\u7684\u503c\uff0c\u5982\u679c\u503c\u4e0e\u63d0\u4f9b\u7684\u503c\u76f8\u540c\u624d\u5141\u8bb8\u64cd\u4f5c\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\"> &#8211;<\/span> prevIndex \u5148\u524d\u8282\u70b9\u7684\u7f16\u53f7\uff0c\u7f16\u53f7\u4e0e\u63d0\u4f9b\u7684\u6821\u9a8c\u7f16\u53f7\u76f8\u540c\u624d\u5141\u8bb8\u64cd\u4f5c\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\"> &#8211;<\/span> prevExist \u5148\u524d\u8282\u70b9\u662f\u5426\u5b58\u5728\u3002\u5982\u679c\u5b58\u5728\u5219\u4e0d\u5141\u8bb8\u64cd\u4f5c\u3002\u8fd9\u4e2a\u5e38\u5e38\u88ab\u7528\u4e8e\u5206\u5e03\u5f0f\u9501\u7684\u552f\u4e00\u83b7\u53d6\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"6\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"7\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u5047\u8bbe\u5148\u8fdb\u884c\u4e86\u5982\u4e0b\u64cd\u4f5c\uff1a\u8bbe\u5b9a\u4e86 foo \u7684\u503c\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"8\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs markdown\"><\/code><\/pre>\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/foo\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/foo\u00a0<\/a>-XPUT -d value=one<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u7136\u540e\u518d\u8fdb\u884c\u64cd\u4f5c\uff1a<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs\"><\/code><\/pre>\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/foo?prevExist=false\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/foo?prevExist=false\u00a0<\/a>-XPUT -d value=three<\/p>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u5c31\u4f1a\u8fd4\u56de\u521b\u5efa\u5931\u8d25\u7684\u9519\u8bef\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; \u6761\u4ef6\u5220\u9664\uff08Compare-and-Delete\uff09\uff1a\u4e0e CAS \u7c7b\u4f3c\uff0c\u6761\u4ef6\u6210\u7acb\u540e\u624d\u80fd\u5220\u9664\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; \u521b\u5efa\u76ee\u5f55 &#8220;`<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"6\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"7\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">curl http:<span class=\"hljs-regexp\">\/\/<\/span><span class=\"hljs-number\">127.0<\/span>.<span class=\"hljs-number\">0.1<\/span>:<span class=\"hljs-number\">2379<\/span><span class=\"hljs-regexp\">\/v2\/<\/span>keys\/dir -XPUT -d dir=true<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs awk\"><\/code><\/pre>\n<ul>\n<li>\u5217\u51fa\u76ee\u5f55\u4e0b\u6240\u6709\u7684\u8282\u70b9\u4fe1\u606f\uff0c\u6700\u540e\u4ee5<code>\/<\/code>\u7ed3\u5c3e\u3002\u8fd8\u53ef\u4ee5\u901a\u8fc7 recursive \u53c2\u6570\u9012\u5f52\u5217\u51fa\u6240\u6709\u5b50\u76ee\u5f55\u4fe1\u606f\u3002 &#8220;`\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/<\/a><\/li>\n<\/ul>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs autohotkey\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">&#8211; \u5220\u9664\u76ee\u5f55\uff1a\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u53ea\u5141\u8bb8\u5220\u9664\u7a7a\u76ee\u5f55\uff0c\u5982\u679c\u8981\u5220\u9664\u6709\u5185\u5bb9\u7684\u76ee\u5f55\u9700\u8981\u52a0\u4e0a`recursive=<span class=\"hljs-literal\">true<\/span>`\u53c2\u6570\u3002 &#8220;`<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-title\"> curl &#8216;http:\/\/127.0.0.1:<\/span><span class=\"hljs-number\">2379<\/span>\/v2\/keys\/foo_dir?dir=<span class=\"hljs-literal\">true<\/span>&#8216; -XDELETE<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs autohotkey\"><\/code><\/pre>\n<ul>\n<li>\u521b\u5efa\u4e00\u4e2a\u9690\u85cf\u8282\u70b9\uff1a\u547d\u540d\u65f6\u540d\u5b57\u4ee5\u4e0b\u5212\u7ebf<code>_<\/code>\u5f00\u5934\u9ed8\u8ba4\u5c31\u662f\u9690\u85cf\u952e\u3002 &#8220;`\n<p>curl\u00a0<a href=\"http:\/\/127.0.0.1:2379\/v2\/keys\/_message\" target=\"_blank\" rel=\"noopener nofollow\">http:\/\/127.0.0.1:2379\/v2\/keys\/_message\u00a0<\/a>-XPUT -d value=\u201cHello hidden world\u201d<\/li>\n<\/ul>\n<div class=\"tool\">\n<div class=\"copy\"><span class=\"iconfont\">\ue676<\/span>\u590d\u5236\u4ee3\u7801<\/p>\n<div class=\"tooltip\"><\/div>\n<\/div>\n<\/div>\n<pre><code class=\"hljs markdown\"><\/code><\/pre>\n<table class=\"hljs-ln\">\n<tbody>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"1\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"2\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u76f8\u4fe1\u770b\u5b8c\u8fd9\u4e48\u591a API\uff0c\u8bfb\u8005\u5df2\u7ecf\u5bf9 Store \u7684\u5de5\u4f5c\u5185\u5bb9\u57fa\u672c\u4e86\u89e3\u4e86\u3002\u5b83\u5bf9 etcd \u4e0b\u5b58\u50a8\u7684\u6570\u636e\u8fdb\u884c\u52a0\u5de5\uff0c\u521b\u5efa\u51fa\u5982\u6587\u4ef6\u7cfb\u7edf\u822c\u7684\u6811\u72b6\u7ed3\u6784\u4f9b\u7528\u6237\u5feb\u901f\u67e5\u8be2\u3002\u5b83\u6709\u4e00\u4e2a<span class=\"hljs-code\">`Watcher`<\/span>\u7528\u4e8e\u8282\u70b9\u53d8\u66f4\u7684\u5b9e\u65f6\u53cd\u9988\uff0c\u8fd8\u9700\u8981\u7ef4\u62a4\u4e00\u4e2a<span class=\"hljs-code\">`WatcherHub`<\/span>\u5bf9\u6240\u6709<span class=\"hljs-code\">`Watcher`<\/span>\u8ba2\u9605\u8005\u8fdb\u884c\u901a\u77e5\u7684\u63a8\u9001\u3002\u540c\u65f6\uff0c\u5b83\u8fd8\u7ef4\u62a4\u4e86\u4e00\u4e2a\u7531\u5b9a\u65f6\u952e\u6784\u6210\u7684\u5c0f\u9876\u5806\uff0c\u5feb\u901f\u8fd4\u56de\u4e0b\u4e00\u4e2a\u8981\u8d85\u65f6\u7684\u952e\u3002\u6700\u540e\uff0c\u6240\u6709\u8fd9\u4e9b API \u7684\u8bf7\u6c42\u90fd\u4ee5\u4e8b\u4ef6\u7684\u5f62\u5f0f\u5b58\u50a8\u5728\u4e8b\u4ef6\u961f\u5217\u4e2d\u7b49\u5f85\u5904\u7406\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"3\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"4\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-section\">### 9 \u603b\u7ed3<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"5\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"6\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u901a\u8fc7\u4ece\u5e94\u7528\u573a\u666f\u5230\u6e90\u7801\u5206\u6790\u7684\u4e00\u7cfb\u5217\u56de\u987e\uff0c\u6211\u4eec\u4e86\u89e3\u5230 etcd \u5e76\u4e0d\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5206\u5e03\u5f0f\u952e\u503c\u5b58\u50a8\u7cfb\u7edf\u3002\u5b83\u89e3\u51b3\u4e86\u5206\u5e03\u5f0f\u573a\u666f\u4e2d\u6700\u4e3a\u5e38\u89c1\u7684\u4e00\u81f4\u6027\u95ee\u9898\uff0c\u4e3a\u670d\u52a1\u53d1\u73b0\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7a33\u5b9a\u9ad8\u53ef\u7528\u7684\u6d88\u606f\u6ce8\u518c\u4ed3\u5e93\uff0c\u4e3a\u4ee5\u5fae\u670d\u52a1\u534f\u540c\u5de5\u4f5c\u7684\u67b6\u6784\u63d0\u4f9b\u4e86\u65e0\u9650\u7684\u53ef\u80fd\u3002\u76f8\u4fe1\u5728\u4e0d\u4e45\u7684\u5c06\u6765\uff0c\u901a\u8fc7 etcd \u6784\u5efa\u8d77\u6765\u7684\u5927\u578b\u7cfb\u7edf\u4f1a\u8d8a\u6765\u8d8a\u591a\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"7\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"8\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-section\">### 10 \u4f5c\u8005\u7b80\u4ecb<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"9\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"10\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u5b59\u5065\u6ce2\uff0c[<span class=\"hljs-string\">\u6d59\u6c5f\u5927\u5b66 SEL \u5b9e\u9a8c\u5ba4\u7855\u58eb\u7814\u7a76\u751f<\/span>](<span class=\"hljs-link\">http:\/\/www.sel.zju.edu.cn<\/span>)\uff0c\u76ee\u524d\u5728\u4e91\u5e73\u53f0\u56e2\u961f\u4ece\u4e8b\u79d1\u7814\u548c\u5f00\u53d1\u5de5\u4f5c\u3002\u6d59\u5927\u56e2\u961f\u5bf9 PaaS\u3001Docker\u3001\u5927\u6570\u636e\u548c\u4e3b\u6d41\u5f00\u6e90\u4e91\u8ba1\u7b97\u6280\u672f\u6709\u6df1\u5165\u7684\u7814\u7a76\u548c\u4e8c\u6b21\u5f00\u53d1\u7ecf\u9a8c\uff0c\u56e2\u961f\u73b0\u5c06\u90e8\u5206\u6280\u672f\u6587\u7ae0\u8d21\u732e\u51fa\u6765\uff0c\u5e0c\u671b\u80fd\u5bf9\u8bfb\u8005\u6709\u6240\u5e2e\u52a9\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"11\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"12\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-section\">### \u53c2\u8003\u6587\u732e<\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"13\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"14\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">1.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">https:<\/span>\/\/<span class=\"hljs-attr\">github.com<\/span>\/<span class=\"hljs-attr\">coreos<\/span>\/<span class=\"hljs-attr\">etcd<\/span>&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"15\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">2.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">https:<\/span>\/\/<span class=\"hljs-attr\">groups.google.com<\/span>\/<span class=\"hljs-attr\">forum<\/span>\/#!<span class=\"hljs-attr\">topic<\/span>\/<span class=\"hljs-attr\">etcd-dev<\/span>\/<span class=\"hljs-attr\">wmndjzBNdZo<\/span>&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"16\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">3.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">http:<\/span>\/\/<span class=\"hljs-attr\">jm-blog.aliapp.com<\/span>\/?<span class=\"hljs-attr\">p<\/span>=<span class=\"hljs-string\">1232<\/span>&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"17\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">4.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">http:<\/span>\/\/<span class=\"hljs-attr\">progrium.com<\/span>\/<span class=\"hljs-attr\">blog<\/span>\/<span class=\"hljs-attr\">2014<\/span>\/<span class=\"hljs-attr\">07<\/span>\/<span class=\"hljs-attr\">29<\/span>\/<span class=\"hljs-attr\">understanding-modern-service-discovery-with-docker<\/span>\/&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"18\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">5.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">http:<\/span>\/\/<span class=\"hljs-attr\">devo.ps<\/span>\/<span class=\"hljs-attr\">blog<\/span>\/<span class=\"hljs-attr\">zookeeper-vs-doozer-vs-etcd<\/span>\/&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"19\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">6.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">http:<\/span>\/\/<span class=\"hljs-attr\">jasonwilder.com<\/span>\/<span class=\"hljs-attr\">blog<\/span>\/<span class=\"hljs-attr\">2014<\/span>\/<span class=\"hljs-attr\">02<\/span>\/<span class=\"hljs-attr\">04<\/span>\/<span class=\"hljs-attr\">service-discovery-in-the-cloud<\/span>\/&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"20\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">7.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">http:<\/span>\/\/<span class=\"hljs-attr\">www.infoworld.com<\/span>\/<span class=\"hljs-attr\">article<\/span>\/<span class=\"hljs-attr\">2612082<\/span>\/<span class=\"hljs-attr\">open-source-software<\/span>\/<span class=\"hljs-attr\">has-apache-lost-its-way-.html<\/span>&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"21\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">8.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">http:<\/span>\/\/<span class=\"hljs-attr\">en.wikipedia.org<\/span>\/<span class=\"hljs-attr\">wiki<\/span>\/<span class=\"hljs-attr\">WAL<\/span>&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"22\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">9.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">http:<\/span>\/\/<span class=\"hljs-attr\">www.infoq.com<\/span>\/<span class=\"hljs-attr\">cn<\/span>\/<span class=\"hljs-attr\">articles<\/span>\/<span class=\"hljs-attr\">coreos-analyse-etcd<\/span>&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"23\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">10.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">http:<\/span>\/\/<span class=\"hljs-attr\">www.activestate.com<\/span>\/<span class=\"hljs-attr\">blog<\/span>\/<span class=\"hljs-attr\">2014<\/span>\/<span class=\"hljs-attr\">05<\/span>\/<span class=\"hljs-attr\">service-discovery-solutions<\/span>&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"24\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">11.<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">https:<\/span>\/\/<span class=\"hljs-attr\">ramcloud.stanford.edu<\/span>\/<span class=\"hljs-attr\">raft.pdf<\/span>&gt;<\/span><\/span><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"25\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"26\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><span class=\"hljs-bullet\">&#8211;<\/span> &#8211; &#8211; &#8211; &#8211; &#8211;<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"27\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"28\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u611f\u8c22 [<span class=\"hljs-string\">\u90ed\u857e<\/span>](<span class=\"hljs-link\">http:\/\/www.infoq.com\/cn\/author\/%E9%83%AD%E8%95%BE<\/span>) \u5bf9\u672c\u6587\u7684\u7b56\u5212\u548c\u5ba1\u6821\u3002<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"29\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\"><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"hljs-ln-numbers\">\n<div class=\"hljs-ln-line hljs-ln-n\" data-line-number=\"30\"><\/div>\n<\/td>\n<td class=\"hljs-ln-code\">\n<div class=\"hljs-ln-line\">\u7ed9 InfoQ \u4e2d\u6587\u7ad9\u6295\u7a3f\u6216\u8005\u53c2\u4e0e\u5185\u5bb9\u7ffb\u8bd1\u5de5\u4f5c\uff0c\u8bf7\u90ae\u4ef6\u81f3 [<span class=\"hljs-string\">editors@cn.infoq.com<\/span>](<span class=\"hljs-link\">mailto:editors@cn.infoq.com<\/span>)\u3002\u4e5f\u6b22\u8fce\u5927\u5bb6\u901a\u8fc7\u65b0\u6d6a\u5fae\u535a\uff08[<span class=\"hljs-string\">@InfoQ<\/span>](<span class=\"hljs-link\">http:\/\/www.weibo.com\/infoqchina<\/span>)\uff09\u6216\u8005\u817e\u8baf\u5fae\u535a\uff08[<span class=\"hljs-string\">@InfoQ<\/span>](<span class=\"hljs-link\">http:\/\/t.qq.com\/infoqchina<\/span>)\uff09\u5173\u6ce8\u6211\u4eec\uff0c\u5e76\u4e0e\u6211\u4eec\u7684\u7f16\u8f91\u548c\u5176\u4ed6\u8bfb\u8005\u670b\u53cb\u4ea4\u6d41\u3002<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"hljs markdown\"><\/code><\/pre>\n<\/div>\n<div class=\"selection-operation-bar note-bar popup-note-menu down\" data-v-026a1842=\"\" data-v-1d55b616=\"\">\n<div class=\"arrow down\" data-v-026a1842=\"\"><\/div>\n<div class=\"main\" data-v-026a1842=\"\">\n<div class=\"menu line\" data-v-026a1842=\"\"><\/div>\n<div class=\"menu comment\" data-v-026a1842=\"\"><\/div>\n<div class=\"menu copy\" data-v-026a1842=\"\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"article-widget-foot\" data-v-6e512f62=\"\" data-v-4169f0eb=\"\" data-v-453a4212=\"\">\n<div class=\"foot-detail publish-time\" data-v-6e512f62=\"\"><span class=\"date\" data-v-6e512f62=\"\">2015 \u5e74 1 \u6708 30 \u65e5 14:51<\/span><span class=\"read-count\" data-v-6e512f62=\"\">85735<\/span><\/div>\n<div class=\"foot-detail copyright\" data-v-6e512f62=\"\">\u6587\u7ae0\u7248\u6743\u5f52\u6781\u5ba2\u90a6\u79d1\u6280InfoQ\u6240\u6709\uff0c\u672a\u7ecf\u8bb8\u53ef\u4e0d\u5f97\u8f6c\u8f7d\u3002<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740 &nbsp; \u5b59\u5065\u6ce2 \ue6b4201<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[118],"class_list":["post-5400","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5400","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=5400"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5400\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=5400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=5400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=5400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}