{"id":5388,"date":"2021-07-12T15:43:44","date_gmt":"2021-07-12T07:43:44","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=5388"},"modified":"2021-07-12T15:43:44","modified_gmt":"2021-07-12T07:43:44","slug":"etcd-%e4%bd%bf%e7%94%a8%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5388","title":{"rendered":"etcd \u4f7f\u7528\u5165\u95e8"},"content":{"rendered":"<div class=\"inner\">\n<header class=\"post-full-header\">\n<p class=\"post-full-title\"><a href=\"https:\/\/cizixs.com\/2016\/08\/02\/intro-to-etcd\/\">\u539f\u6587\u5730\u5740<\/a><\/p>\n<p>&nbsp;<\/p>\n<\/header>\n<article class=\"post-full no-image\">\n<section class=\"post-full-content\">\n<div id=\"lightgallery\" class=\"markdown-body\">\n<h2 id=\"1-etcd-\u7b80\u4ecb\">1. etcd \u7b80\u4ecb<\/h2>\n<p>coreos \u5f00\u53d1\u7684\u5206\u5e03\u5f0f\u670d\u52a1\u7cfb\u7edf\uff0c\u5185\u90e8\u91c7\u7528 raft \u534f\u8bae\u4f5c\u4e3a\u4e00\u81f4\u6027\u7b97\u6cd5\u3002\u4f5c\u4e3a\u670d\u52a1\u53d1\u73b0\u7cfb\u7edf\uff0c\u6709\u4ee5\u4e0b\u7684\u7279\u70b9\uff1a<\/p>\n<ul>\n<li>\u7b80\u5355\uff1a\u5b89\u88c5\u914d\u7f6e\u7b80\u5355\uff0c\u800c\u4e14\u63d0\u4f9b\u4e86 HTTP API \u8fdb\u884c\u4ea4\u4e92\uff0c\u4f7f\u7528\u4e5f\u5f88\u7b80\u5355<\/li>\n<li>\u5b89\u5168\uff1a\u652f\u6301 SSL \u8bc1\u4e66\u9a8c\u8bc1<\/li>\n<li>\u5feb\u901f\uff1a\u6839\u636e<a href=\"https:\/\/coreos.com\/etcd\/docs\/latest\/benchmarks\/etcd-2-2-0-rc-benchmarks.html\" target=\"_blank\" rel=\"noopener\">\u5b98\u65b9\u63d0\u4f9b\u7684 benchmark \u6570\u636e<\/a>\uff0c\u5355\u5b9e\u4f8b\u652f\u6301\u6bcf\u79d2 2k+ \u8bfb\u64cd\u4f5c<\/li>\n<li>\u53ef\u9760\uff1a\u91c7\u7528\u00a0<a href=\"https:\/\/raft.github.io\/\" target=\"_blank\" rel=\"noopener\">raft \u7b97\u6cd5<\/a>\uff0c\u5b9e\u73b0\u5206\u5e03\u5f0f\u7cfb\u7edf\u6570\u636e\u7684\u53ef\u7528\u6027\u548c\u4e00\u81f4\u6027<\/li>\n<\/ul>\n<p>\u5728\u8fd9\u7bc7\u6587\u7ae0\u7f16\u5199\u7684\u65f6\u5019\uff0cetcd \u5df2\u7ecf\u53d1\u5e03\u4e86\u00a0<code>3.0.4<\/code>\u00a0\u7248\u672c\uff0c\u88ab\u88ab\u7528\u5728 CoreOS\u3001kubernetes\u3001Cloud Foundry \u7b49\u9879\u76ee\u4e2d\u3002<\/p>\n<p>etcd \u76ee\u524d\u9ed8\u8ba4\u4f7f\u7528\u00a0<code>2379<\/code>\u00a0\u7aef\u53e3\u63d0\u4f9b HTTP API \u670d\u52a1\uff0c<code>2380<\/code>\u00a0\u7aef\u53e3\u548c peer \u901a\u4fe1\uff08\u8fd9\u4e24\u4e2a\u7aef\u53e3\u5df2\u7ecf\u88ab\u00a0<a href=\"https:\/\/www.iana.org\/assignments\/service-names-port-numbers\/service-names-port-numbers.xhtml?search=etcd\" target=\"_blank\" rel=\"noopener\">IANA \u5b98\u65b9\u9884\u7559\u7ed9 etcd<\/a>\uff09\uff1b\u5728\u4e4b\u524d\u7684\u7248\u672c\u4e2d\uff0c\u53ef\u80fd\u4f1a\u5206\u522b\u4f7f\u7528\u00a0<code>4001<\/code>\u00a0\u548c\u00a0<code>7001<\/code>\uff0c\u5728\u4f7f\u7528\u7684\u8fc7\u7a0b\u4e2d\u9700\u8981\u6ce8\u610f\u8fd9\u4e2a\u533a\u522b\u3002<\/p>\n<p>\u867d\u7136 etcd \u4e5f\u652f\u6301\u5355\u70b9\u90e8\u7f72\uff0c\u4f46\u662f\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u63a8\u8350\u96c6\u7fa4\u65b9\u5f0f\u90e8\u7f72\uff0c\u4e00\u822c etcd \u8282\u70b9\u6570\u4f1a\u9009\u62e9 3\u30015\u30017\u3002etcd \u4f1a\u4fdd\u8bc1\u6240\u6709\u7684\u8282\u70b9\u90fd\u4f1a\u4fdd\u5b58\u6570\u636e\uff0c\u5e76\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u6b63\u786e\u6027\u3002<\/p>\n<h2 id=\"2-\u5b89\u88c5\">2. \u5b89\u88c5<\/h2>\n<p>\u56e0\u4e3a etcd \u662f go \u8bed\u8a00\u7f16\u5199\u7684\uff0c\u5b89\u88c5\u53ea\u9700\u8981\u4e0b\u8f7d\u5bf9\u5e94\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\uff0c\u5e76\u653e\u5230\u5408\u9002\u7684\u8def\u5f84\u5c31\u884c\u3002<\/p>\n<h3 id=\"\u5355\u70b9\u5b89\u88c5\">\u5355\u70b9\u5b89\u88c5<\/h3>\n<p>\u5982\u679c\u5728\u6d4b\u8bd5\u73af\u5883\uff0c\u542f\u52a8\u4e00\u4e2a\u5355\u70b9\u7684 etcd \u670d\u52a1\uff0c\u53ea\u9700\u8981\u8fd0\u884c\u00a0<code>etcd<\/code>\u00a0\u547d\u4ee4\u5c31\u884c\u3002<\/p>\n<pre><code class=\"hljs sql\">\u279c  etcd-v3.0.4-darwin-amd64 .\/etcd\r\n2016-08-01 23:33:09.066930 I | etcdmain: etcd Version: 3.0.4\r\n2016-08-01 23:33:09.067085 I | etcdmain: Git SHA: d53923c\r\n2016-08-01 23:33:09.067092 I | etcdmain: Go Version: go1.6.3\r\n2016-08-01 23:33:09.067101 I | etcdmain: Go OS\/Arch: darwin\/amd64\r\n2016-08-01 23:33:09.067111 I | etcdmain: setting maximum number of CPUs to 4, total number of available CPUs is 4\r\n2016-08-01 23:33:09.067120 W | etcdmain: no data-dir provided, using default data-dir .\/default.etcd\r\n2016-08-01 23:33:09.067803 I | etcdmain: listening for peers on http:\/\/localhost:2380\r\n2016-08-01 23:33:09.068123 I | etcdmain: listening for client requests on localhost:2379\r\n2016-08-01 23:33:09.069442 I | etcdserver: name = default\r\n2016-08-01 23:33:09.069465 I | etcdserver: data dir = default.etcd\r\n2016-08-01 23:33:09.069474 I | etcdserver: member dir = default.etcd\/member\r\n2016-08-01 23:33:09.069480 I | etcdserver: heartbeat = 100ms\r\n2016-08-01 23:33:09.069485 I | etcdserver: election = 1000ms\r\n2016-08-01 23:33:09.069491 I | etcdserver: snapshot count = 10000\r\n2016-08-01 23:33:09.069510 I | etcdserver: advertise client URLs = http:\/\/localhost:2379\r\n2016-08-01 23:33:09.069523 I | etcdserver: initial advertise peer URLs = http:\/\/localhost:2380\r\n2016-08-01 23:33:09.069536 I | etcdserver: initial cluster = default=http:\/\/localhost:2380\r\n2016-08-01 23:33:09.258167 I | etcdserver: starting member 8e9e05c52164694d in cluster cdf818194e3a8c32\r\n2016-08-01 23:33:09.258927 I | raft: 8e9e05c52164694d became follower at term 0\r\n2016-08-01 23:33:09.259395 I | raft: newRaft 8e9e05c52164694d [peers: [], term: 0, <span class=\"hljs-keyword\">commit<\/span>: <span class=\"hljs-number\">0<\/span>, applied: <span class=\"hljs-number\">0<\/span>, lastindex: <span class=\"hljs-number\">0<\/span>, lastterm: <span class=\"hljs-number\">0<\/span>]\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.259594<\/span> I | raft: <span class=\"hljs-number\">8e9<\/span>e05c52164694d became follower <span class=\"hljs-keyword\">at<\/span> term <span class=\"hljs-number\">1<\/span>\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.331125<\/span> I | etcdserver: <span class=\"hljs-keyword\">starting<\/span> server... [<span class=\"hljs-keyword\">version<\/span>: <span class=\"hljs-number\">3.0<\/span><span class=\"hljs-number\">.4<\/span>, cluster <span class=\"hljs-keyword\">version<\/span>: to_be_decided]\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.331800<\/span> E | etcdserver: cannot monitor <span class=\"hljs-keyword\">file<\/span> <span class=\"hljs-keyword\">descriptor<\/span> <span class=\"hljs-keyword\">usage<\/span> (cannot <span class=\"hljs-keyword\">get<\/span> FDUsage <span class=\"hljs-keyword\">on<\/span> darwin)\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.334611<\/span> I | membership: added <span class=\"hljs-keyword\">member<\/span> <span class=\"hljs-number\">8e9<\/span>e05c52164694d [<span class=\"hljs-keyword\">http<\/span>:\/\/localhost:<span class=\"hljs-number\">2380<\/span>] <span class=\"hljs-keyword\">to<\/span> cluster cdf818194e3a8c32\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.499412<\/span> I | raft: <span class=\"hljs-number\">8e9<\/span>e05c52164694d <span class=\"hljs-keyword\">is<\/span> <span class=\"hljs-keyword\">starting<\/span> a <span class=\"hljs-keyword\">new<\/span> election <span class=\"hljs-keyword\">at<\/span> term <span class=\"hljs-number\">1<\/span>\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.499450<\/span> I | raft: <span class=\"hljs-number\">8e9<\/span>e05c52164694d became candidate <span class=\"hljs-keyword\">at<\/span> term <span class=\"hljs-number\">2<\/span>\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.499462<\/span> I | raft: <span class=\"hljs-number\">8e9<\/span>e05c52164694d received vote <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-number\">8e9<\/span>e05c52164694d <span class=\"hljs-keyword\">at<\/span> term <span class=\"hljs-number\">2<\/span>\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.499480<\/span> I | raft: <span class=\"hljs-number\">8e9<\/span>e05c52164694d became leader <span class=\"hljs-keyword\">at<\/span> term <span class=\"hljs-number\">2<\/span>\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.499493<\/span> I | raft: raft.node: <span class=\"hljs-number\">8e9<\/span>e05c52164694d elected leader <span class=\"hljs-number\">8e9<\/span>e05c52164694d <span class=\"hljs-keyword\">at<\/span> term <span class=\"hljs-number\">2<\/span>\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.499702<\/span> I | etcdserver: setting up the <span class=\"hljs-keyword\">initial<\/span> cluster <span class=\"hljs-keyword\">version<\/span> <span class=\"hljs-keyword\">to<\/span> <span class=\"hljs-number\">3.0<\/span>\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.507070<\/span> N | membership: <span class=\"hljs-keyword\">set<\/span> the <span class=\"hljs-keyword\">initial<\/span> cluster <span class=\"hljs-keyword\">version<\/span> <span class=\"hljs-keyword\">to<\/span> <span class=\"hljs-number\">3.0<\/span>\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.507129<\/span> I | api: enabled capabilities <span class=\"hljs-keyword\">for<\/span> <span class=\"hljs-keyword\">version<\/span> <span class=\"hljs-number\">3.0<\/span>\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.507211<\/span> I | etcdserver: published {<span class=\"hljs-keyword\">Name<\/span>:<span class=\"hljs-keyword\">default<\/span> ClientURLs:[<span class=\"hljs-keyword\">http<\/span>:\/\/localhost:<span class=\"hljs-number\">2379<\/span>]} <span class=\"hljs-keyword\">to<\/span> cluster cdf818194e3a8c32\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.507221<\/span> I | etcdmain: ready <span class=\"hljs-keyword\">to<\/span> serve <span class=\"hljs-keyword\">client<\/span> requests\r\n<span class=\"hljs-number\">2016<\/span><span class=\"hljs-number\">-08<\/span><span class=\"hljs-number\">-01<\/span> <span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">33<\/span>:<span class=\"hljs-number\">09.507811<\/span> N | etcdmain: serving insecure <span class=\"hljs-keyword\">client<\/span> requests <span class=\"hljs-keyword\">on<\/span> localhost:<span class=\"hljs-number\">2379<\/span>, this <span class=\"hljs-keyword\">is<\/span> strongly discouraged!\r\n<\/code><\/pre>\n<p>\u4ece\u4e0a\u9762\u7684\u8f93\u51fa\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5f88\u591a\u4fe1\u606f\uff1a<\/p>\n<ul>\n<li>etcd \u9ed8\u8ba4\u5c06\u6570\u636e\u5b58\u653e\u5230\u5f53\u524d\u8def\u5f84\u7684\u00a0<code>default.etcd\/<\/code>\u00a0\u76ee\u5f55\u4e0b<\/li>\n<li>\u5728\u00a0<code>http:\/\/localhost:2380<\/code>\u00a0\u548c\u96c6\u7fa4\u4e2d\u5176\u4ed6\u8282\u70b9\u901a\u4fe1<\/li>\n<li>\u5728\u00a0<code>http:\/\/localhost:2379<\/code>\u00a0\u63d0\u4f9b HTTP API \u670d\u52a1\uff0c\u4f9b\u5ba2\u6237\u7aef\u4ea4\u4e92<\/li>\n<li>\u8be5\u8282\u70b9\u7684\u540d\u79f0\u9ed8\u8ba4\u4e3a\u00a0<code>default<\/code><\/li>\n<li>heartbeat \u4e3a 100ms\uff0c\u540e\u9762\u4f1a\u8bf4\u660e\u8fd9\u4e2a\u914d\u7f6e\u7684\u4f5c\u7528<\/li>\n<li>election \u4e3a 1000ms\uff0c\u540e\u9762\u4f1a\u8bf4\u660e\u8fd9\u4e2a\u914d\u7f6e\u7684\u4f5c\u7528<\/li>\n<li>snapshot count \u4e3a 10000\uff0c\u540e\u9762\u4f1a\u8bf4\u660e\u8fd9\u4e2a\u914d\u7f6e\u7684\u4f5c\u7528<\/li>\n<li>\u96c6\u7fa4\u548c\u6bcf\u4e2a\u8282\u70b9\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a uuid<\/li>\n<li>\u542f\u52a8\u7684\u65f6\u5019\uff0c\u4f1a\u8fd0\u884c raft\uff0c\u9009\u4e3e\u51fa leader<\/li>\n<\/ul>\n<h3 id=\"\u96c6\u7fa4\u5b89\u88c5\">\u96c6\u7fa4\u5b89\u88c5<\/h3>\n<p>\u5728\u5b89\u88c5\u548c\u542f\u52a8 etcd \u670d\u52a1\u7684\u65f6\u5019\uff0c\u5404\u4e2a\u8282\u70b9\u9700\u8981\u77e5\u9053\u96c6\u7fa4\u4e2d\u5176\u4ed6\u8282\u70b9\u7684\u4fe1\u606f\uff08\u4e00\u822c\u662f ip \u548c port \u4fe1\u606f\uff09\u3002\u6839\u636e\u4f60\u662f\u5426\u53ef\u4ee5\u63d0\u524d\u77e5\u9053\u6bcf\u4e2a\u8282\u70b9\u7684 ip\uff0c\u6709\u51e0\u79cd\u4e0d\u540c\u7684\u542f\u52a8\u65b9\u6848\uff1a<\/p>\n<ul>\n<li>\u9759\u6001\u914d\u7f6e\uff1a\u5728\u542f\u52a8 etcd server \u7684\u65f6\u5019\uff0c\u901a\u8fc7\u00a0<code>--initial-cluster<\/code>\u00a0\u53c2\u6570\u914d\u7f6e\u597d\u6240\u6709\u7684\u8282\u70b9\u4fe1\u606f<\/li>\n<li>\u4f7f\u7528\u5df2\u6709\u7684 etcd cluster \u6765\u6ce8\u518c\u548c\u542f\u52a8\uff0c\u6bd4\u5982\u5b98\u65b9\u63d0\u4f9b\u7684\u00a0<code>discovery.etcd.io<\/code><\/li>\n<li>\u4f7f\u7528 DNS \u542f\u52a8\uff0c<\/li>\n<\/ul>\n<p><a href=\"https:\/\/coreos.com\/etcd\/docs\/latest\/clustering.html\" target=\"_blank\" rel=\"noopener\">etcd \u7684\u5b89\u88c5\u6587\u6863<\/a>\u5b98\u7f51\u5df2\u7ecf\u7ed9\u51fa\u4e86\uff0c\u8fd9\u91cc\u4e0d\u518d\u8d58\u8ff0\u3002\u5f53\u7136\uff0c\u4f60\u4e5f\u53ef\u4ee5\u901a\u8fc7 docker \u6765\u5b89\u88c5 etcd\uff0c\u5177\u4f53\u7684\u6587\u6863\u53ef\u4ee5\u770b<a href=\"https:\/\/coreos.com\/etcd\/docs\/latest\/docker_guide.html\" target=\"_blank\" rel=\"noopener\">\u8fd9\u91cc<\/a>\u3002<\/p>\n<p>\u4e0b\u9762\u7ed9\u51fa\u53ef\u4ee5\u5e38\u7528\u914d\u7f6e\u7684\u53c2\u6570\u548c\u5b83\u4eec\u7684\u89e3\u91ca\uff0c\u65b9\u4fbf\u7406\u89e3\uff1a<\/p>\n<ul>\n<li><code>--name<\/code>\uff1a\u65b9\u4fbf\u7406\u89e3\u7684\u8282\u70b9\u540d\u79f0\uff0c\u9ed8\u8ba4\u4e3a\u00a0<code>default<\/code>\uff0c\u5728\u96c6\u7fa4\u4e2d\u5e94\u8be5\u4fdd\u6301\u552f\u4e00\uff0c\u53ef\u4ee5\u4f7f\u7528 hostname<\/li>\n<li><code>--data-dir<\/code>\uff1a\u670d\u52a1\u8fd0\u884c\u6570\u636e\u4fdd\u5b58\u7684\u8def\u5f84\uff0c\u9ed8\u8ba4\u4e3a\u00a0<code>${name}.etcd<\/code><\/li>\n<li><code>--snapshot-count<\/code>\uff1a\u6307\u5b9a\u6709\u591a\u5c11\u4e8b\u52a1\uff08transaction\uff09\u88ab\u63d0\u4ea4\u65f6\uff0c\u89e6\u53d1\u622a\u53d6\u5feb\u7167\u4fdd\u5b58\u5230\u78c1\u76d8<\/li>\n<li><code>--heartbeat-interval<\/code>\uff1aleader \u591a\u4e45\u53d1\u9001\u4e00\u6b21\u5fc3\u8df3\u5230 followers\u3002\u9ed8\u8ba4\u503c\u662f 100ms<\/li>\n<li><code>--eletion-timeout<\/code>\uff1a\u91cd\u65b0\u6295\u7968\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u5982\u679c follow \u5728\u8be5\u65f6\u95f4\u95f4\u9694\u6ca1\u6709\u6536\u5230\u5fc3\u8df3\u5305\uff0c\u4f1a\u89e6\u53d1\u91cd\u65b0\u6295\u7968\uff0c\u9ed8\u8ba4\u4e3a 1000 ms<\/li>\n<li><code>--listen-peer-urls<\/code>\uff1a\u548c\u540c\u4f34\u901a\u4fe1\u7684\u5730\u5740\uff0c\u6bd4\u5982\u00a0<code>http:\/\/ip:2380<\/code>\uff0c\u5982\u679c\u6709\u591a\u4e2a\uff0c\u4f7f\u7528\u9017\u53f7\u5206\u9694\u3002\u9700\u8981\u6240\u6709\u8282\u70b9\u90fd\u80fd\u591f\u8bbf\u95ee\uff0c<strong>\u6240\u4ee5\u4e0d\u8981\u4f7f\u7528 localhost\uff01<\/strong><\/li>\n<li><code>--listen-client-urls<\/code>\uff1a\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\u7684\u5730\u5740\uff1a\u6bd4\u5982\u00a0<code>http:\/\/ip:2379,http:\/\/127.0.0.1:2379<\/code>\uff0c\u5ba2\u6237\u7aef\u4f1a\u8fde\u63a5\u5230\u8fd9\u91cc\u548c etcd \u4ea4\u4e92<\/li>\n<li><code>--advertise-client-urls<\/code>\uff1a\u5bf9\u5916\u516c\u544a\u7684\u8be5\u8282\u70b9\u5ba2\u6237\u7aef\u76d1\u542c\u5730\u5740\uff0c\u8fd9\u4e2a\u503c\u4f1a\u544a\u8bc9\u96c6\u7fa4\u4e2d\u5176\u4ed6\u8282\u70b9<\/li>\n<li><code>--initial-advertise-peer-urls<\/code>\uff1a\u8be5\u8282\u70b9\u540c\u4f34\u76d1\u542c\u5730\u5740\uff0c\u8fd9\u4e2a\u503c\u4f1a\u544a\u8bc9\u96c6\u7fa4\u4e2d\u5176\u4ed6\u8282\u70b9<\/li>\n<li><code>--initial-cluster<\/code>\uff1a\u96c6\u7fa4\u4e2d\u6240\u6709\u8282\u70b9\u7684\u4fe1\u606f\uff0c\u683c\u5f0f\u4e3a\u00a0<code>node1=http:\/\/ip1:2380,node2=http:\/\/ip2:2380,\u2026<\/code>\u3002\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684\u00a0<code>node1<\/code>\u00a0\u662f\u8282\u70b9\u7684\u00a0<code>--name<\/code>\u00a0\u6307\u5b9a\u7684\u540d\u5b57\uff1b\u540e\u9762\u7684\u00a0<code>ip1:2380<\/code>\u00a0\u662f\u00a0<code>--initial-advertise-peer-urls<\/code>\u00a0\u6307\u5b9a\u7684\u503c<\/li>\n<li><code>--initial-cluster-state<\/code>\uff1a\u65b0\u5efa\u96c6\u7fa4\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u503c\u4e3a\u00a0<code>new<\/code>\uff1b\u5047\u5982\u5df2\u7ecf\u5b58\u5728\u7684\u96c6\u7fa4\uff0c\u8fd9\u4e2a\u503c\u4e3a\u00a0<code>existing<\/code><\/li>\n<li><code>--initial-cluster-token<\/code>\uff1a\u521b\u5efa\u96c6\u7fa4\u7684 token\uff0c\u8fd9\u4e2a\u503c\u6bcf\u4e2a\u96c6\u7fa4\u4fdd\u6301\u552f\u4e00\u3002\u8fd9\u6837\u7684\u8bdd\uff0c\u5982\u679c\u4f60\u8981\u91cd\u65b0\u521b\u5efa\u96c6\u7fa4\uff0c\u5373\u4f7f\u914d\u7f6e\u548c\u4e4b\u524d\u4e00\u6837\uff0c\u4e5f\u4f1a\u518d\u6b21\u751f\u6210\u65b0\u7684\u96c6\u7fa4\u548c\u8282\u70b9 uuid\uff1b\u5426\u5219\u4f1a\u5bfc\u81f4\u591a\u4e2a\u96c6\u7fa4\u4e4b\u95f4\u7684\u51b2\u7a81\uff0c\u9020\u6210\u672a\u77e5\u7684\u9519\u8bef<\/li>\n<\/ul>\n<p>\u6240\u6709\u4ee5\u00a0<code>--init<\/code>\u00a0\u5f00\u5934\u7684\u914d\u7f6e\u90fd\u662f\u5728 bootstrap \u96c6\u7fa4\u7684\u65f6\u5019\u624d\u4f1a\u7528\u5230\uff0c\u540e\u7eed\u8282\u70b9\u7684\u91cd\u542f\u4f1a\u88ab\u5ffd\u7565\u3002<\/p>\n<p>NOTE\uff1a\u6240\u6709\u7684\u53c2\u6570\u4e5f\u53ef\u4ee5\u901a\u8fc7\u73af\u5883\u53d8\u91cf\u8fdb\u884c\u8bbe\u7f6e\uff0c<code>--my-flag<\/code>\u00a0\u5bf9\u5e94\u73af\u5883\u53d8\u91cf\u7684\u00a0<code>ETCD_MY_FLAG<\/code>\uff1b\u4f46\u662f\u547d\u4ee4\u884c\u6307\u5b9a\u7684\u53c2\u6570\u4f1a\u8986\u76d6\u73af\u5883\u53d8\u91cf\u5bf9\u5e94\u7684\u503c\u3002<\/p>\n<p>\u5728\u540e\u9762\u7684\u6587\u7ae0\u4e2d\uff0c\u4e3a\u4e86\u7b80\u5355\u8d77\u89c1\uff0c\u6211\u4eec\u91c7\u7528\u4e86\u5355\u70b9\u7684 etcd server\uff0c<strong>\u8bf7\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u914d\u7f6e etcd \u96c6\u7fa4\uff0c\u5e76\u4f7f\u7528 SSL \u5b89\u5168\u673a\u5236<\/strong>\u3002<\/p>\n<h2 id=\"3-etcd-\u57fa\u7840\u77e5\u8bc6\">3. etcd \u57fa\u7840\u77e5\u8bc6<\/h2>\n<p>\u6bcf\u4e2a etcd cluster \u90fd\u662f\u6709\u82e5\u5e72\u4e2a member \u7ec4\u6210\u7684\uff0c\u6bcf\u4e2a member \u662f\u4e00\u4e2a\u72ec\u7acb\u8fd0\u884c\u7684 etcd \u5b9e\u4f8b\uff0c\u5355\u53f0\u673a\u5668\u4e0a\u53ef\u4ee5\u8fd0\u884c\u591a\u4e2a member\u3002<\/p>\n<p>\u5728\u6b63\u5e38\u8fd0\u884c\u7684\u72b6\u6001\u4e0b\uff0c\u96c6\u7fa4\u4e2d\u4f1a\u6709\u4e00\u4e2a leader\uff0c\u5176\u4f59\u7684 member \u90fd\u662f followers\u3002leader \u5411 followers \u540c\u6b65\u65e5\u5fd7\uff0c\u4fdd\u8bc1\u6570\u636e\u5728\u5404\u4e2a member \u90fd\u6709\u526f\u672c\u3002leader \u8fd8\u4f1a\u5b9a\u65f6\u5411\u6240\u6709\u7684 member \u53d1\u9001\u5fc3\u8df3\u62a5\u6587\uff0c\u5982\u679c\u5728\u89c4\u5b9a\u7684\u65f6\u95f4\u91cc follower \u6ca1\u6709\u6536\u5230\u5fc3\u8df3\uff0c\u5c31\u4f1a\u91cd\u65b0\u8fdb\u884c\u9009\u4e3e\u3002<\/p>\n<p>\u5ba2\u6237\u7aef\u6240\u6709\u7684\u8bf7\u6c42\u90fd\u4f1a\u5148\u53d1\u9001\u7ed9 leader\uff0cleader \u5411\u6240\u6709\u7684 followers \u540c\u6b65\u65e5\u5fd7\uff0c\u7b49\u6536\u5230\u8d85\u8fc7\u534a\u6570\u7684\u786e\u8ba4\u540e\u5c31\u628a\u8be5\u65e5\u5fd7\u5b58\u50a8\u5230\u78c1\u76d8\uff0c\u5e76\u8fd4\u56de\u54cd\u5e94\u5ba2\u6237\u7aef\u3002<\/p>\n<p>\u6bcf\u4e2a etcd \u670d\u52a1\u6709\u4e09\u5927\u4e3b\u8981\u90e8\u5206\u7ec4\u6210\uff1araft \u5b9e\u73b0\u3001WAL \u65e5\u5fd7\u5b58\u50a8\u3001\u6570\u636e\u7684\u5b58\u50a8\u548c\u7d22\u5f15\u3002WAL \u4f1a\u5728\u672c\u5730\u78c1\u76d8\uff08\u5c31\u662f\u4e4b\u524d\u63d0\u5230\u7684\u00a0<code>--data-dir<\/code>\uff09\u4e0a\u5b58\u50a8\u65e5\u5fd7\u5185\u5bb9\uff08wal file\uff09\u548c\u5feb\u7167\uff08snapshot\uff09\u3002<\/p>\n<h2 id=\"4-API-\u6587\u6863\">4. API \u6587\u6863<\/h2>\n<p>etcd \u5bf9\u5916\u901a\u8fc7 HTTP API \u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\uff0c\u8fd9\u79cd\u65b9\u5f0f\u65b9\u4fbf\u6d4b\u8bd5\uff08\u901a\u8fc7 curl \u6216\u8005\u5176\u4ed6\u5de5\u5177\u5c31\u80fd\u548c etcd \u4ea4\u4e92\uff09\uff0c\u4e5f\u5f88\u5bb9\u6613\u96c6\u6210\u5230\u5404\u79cd\u8bed\u8a00\u4e2d\uff08\u6bcf\u4e2a\u8bed\u8a00\u5c01\u88c5 HTTP API \u5b9e\u73b0\u81ea\u5df1\u7684 client \u5c31\u884c\uff09\u3002<\/p>\n<p>\u8fd9\u4e2a\u90e8\u5206\uff0c\u6211\u4eec\u5c31\u4ecb\u7ecd etcd \u901a\u8fc7 HTTP API \u63d0\u4f9b\u4e86\u54ea\u4e9b\u529f\u80fd\uff0c\u5e76\u4f7f\u7528\u00a0<a href=\"https:\/\/github.com\/jkbrzt\/httpie\" target=\"_blank\" rel=\"noopener\"><code>httpie<\/code>\u00a0<\/a>\u6765\u4ea4\u4e92\uff08\u5f53\u7136\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528 curl \u6216\u8005\u5176\u4ed6\u5de5\u5177\uff09\u3002<\/p>\n<h3 id=\"\u83b7\u53d6-etcd-\u670d\u52a1\u7684\u7248\u672c\u4fe1\u606f\">\u83b7\u53d6 etcd \u670d\u52a1\u7684\u7248\u672c\u4fe1\u606f<\/h3>\n<pre><code class=\"hljs javascript\">\u279c  http http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/version<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-Length: <span class=\"hljs-number\">44<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">04<\/span>:<span class=\"hljs-number\">27<\/span>:<span class=\"hljs-number\">32<\/span> GMT\r\n\r\n{\r\n    <span class=\"hljs-string\">\"etcdcluster\"<\/span>: <span class=\"hljs-string\">\"3.0.0\"<\/span>,\r\n    <span class=\"hljs-string\">\"etcdserver\"<\/span>: <span class=\"hljs-string\">\"3.0.4\"<\/span>\r\n}\r\n<\/code><\/pre>\n<h3 id=\"key-\u7684\u589e\u5220\u67e5\u6539\">key \u7684\u589e\u5220\u67e5\u6539<\/h3>\n<p>etcd \u7684\u6570\u636e\u6309\u7167\u6811\u5f62\u7684\u7ed3\u6784\u7ec4\u7ec7\uff0c\u7c7b\u4f3c\u4e8e linux \u7684\u6587\u4ef6\u7cfb\u7edf\uff0c\u4e5f\u6709\u76ee\u5f55\u548c\u6587\u4ef6\u7684\u533a\u522b\uff0c\u4e0d\u8fc7\u4e00\u822c\u88ab\u79f0\u4e3a nodes\u3002\u6570\u636e\u7684 endpoint \u90fd\u662f\u4ee5\u00a0<code>\/v2\/keys<\/code>\u00a0\u5f00\u5934\uff08v2 \u8868\u793a\u5f53\u524d API \u7684\u7248\u672c\uff09\uff0c\u6bd4\u5982\u00a0<code>\/v2\/keys\/names\/cizixs<\/code>\u3002<\/p>\n<p>\u8981\u521b\u5efa\u4e00\u4e2a\u503c\uff0c\u53ea\u8981\u4f7f\u7528\u00a0<code>PUT<\/code>\u00a0\u65b9\u6cd5\u5728\u5bf9\u5e94\u7684 url endpoint \u8bbe\u7f6e\u5c31\u884c\u3002\u5982\u679c\u5bf9\u5e94\u7684 key \u5df2\u7ecf\u5b58\u5728\uff0c\u00a0<code>PUT<\/code>\u00a0\u4e5f\u4f1a\u5bf9 key \u8fdb\u884c\u66f4\u65b0\u3002<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http PUT http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/message value==\"hello, etcd\"<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">201<\/span> Created\r\nContent-Length: <span class=\"hljs-number\">100<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">04<\/span>:<span class=\"hljs-number\">48<\/span>:<span class=\"hljs-number\">04<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">4<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">28429<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"set\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">4<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/message\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">4<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"hello, etcd\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u9762\u8fd9\u4e2a\u547d\u4ee4\u901a\u8fc7\u00a0<code>PUT<\/code>\u00a0\u65b9\u6cd5\u628a\u00a0<code>\/message<\/code>\u00a0\u8bbe\u7f6e\u4e3a\u00a0<code>hello, etcd<\/code>\u3002\u8fd4\u56de\u7684\u683c\u5f0f\u4e2d\uff0c\u5404\u4e2a\u5b57\u6bb5\u7684\u610f\u4e49\u662f\uff1a<\/p>\n<ul>\n<li><code>action<\/code>\uff1a\u8bf7\u6c42\u51fa\u53d1\u7684\u52a8\u4f5c\uff0c\u8fd9\u91cc\u56e0\u4e3a\u662f\u65b0\u5efa\u4e00\u4e2a key \u5e76\u8bbe\u7f6e\u5b83\u7684\u503c\uff0c\u6240\u4ee5\u662f\u00a0<code>set<\/code><\/li>\n<li><code>node.key<\/code>\uff1akey \u7684 HTTP \u8def\u5f84<\/li>\n<li><code>node.value<\/code>\uff1a\u8bf7\u6c42\u5904\u7406\u4e4b\u540e\uff0ckey \u7684\u503c<\/li>\n<li><code>node.createdIndex<\/code>\uff1a createdIndex \u662f\u4e00\u4e2a\u9012\u589e\u7684\u503c\uff0c\u6bcf\u6b21\u6709 key \u88ab\u521b\u5efa\u7684\u65f6\u5019\u4f1a\u589e\u52a0<\/li>\n<li><code>node.modifiedIndex<\/code>\uff1a\u540c\u4e0a\uff0c\u53ea\u4e0d\u8fc7\u6bcf\u6b21\u6709 key \u88ab\u4fee\u6539\u7684\u65f6\u5019\u589e\u52a0<\/li>\n<\/ul>\n<p>\u9664\u8fd4\u56de\u7684 json \u4f53\u5916\uff0c\u4e0a\u9762\u7684\u60c5\u51b5\u8fd8\u5305\u542b\u4e86\u4e00\u4e9b\u7279\u6b8a\u7684 HTTP \u5934\u90e8\u4fe1\u606f\uff0c\u8fd9\u4e9b\u4fe1\u606f\u8bf4\u660e\u4e86 etcd cluster \u7684\u4e00\u4e9b\u60c5\u51b5\u3002\u5b83\u4eec\u7684\u5177\u4f53\u542b\u4e49\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><code>X-Etcd-Index<\/code>\uff1a\u5f53\u524d etcd \u96c6\u7fa4\u7684 index<\/li>\n<li><code>X-Raft-Index<\/code>\uff1araft \u96c6\u7fa4\u7684 index<\/li>\n<li><code>X-Raft-Term<\/code>\uff1araft \u96c6\u7fa4\u7684\u4efb\u671f\uff0c\u6bcf\u6b21\u6709 leader \u9009\u4e3e\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u503c\u5c31\u4f1a\u589e\u52a0<\/li>\n<\/ul>\n<p>\u67e5\u770b\u4fe1\u606f\u6bd4\u8f83\u7b80\u5355\uff0c\u4f7f\u7528\u00a0<code>GET<\/code>\u00a0\u65b9\u6cd5\uff0curl \u6307\u5411\u8981\u67e5\u770b\u7684\u503c\u5c31\u884c\uff1a<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http GET http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/message<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-Length: <span class=\"hljs-number\">97<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">05<\/span>:<span class=\"hljs-number\">23<\/span>:<span class=\"hljs-number\">14<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">7<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">30801<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"get\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">7<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/message\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">7<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"hello, etcd\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u7684\u00a0<code>action<\/code>\u00a0\u53d8\u6210\u4e86\u00a0<code>get<\/code>\uff0c\u5176\u4ed6\u8fd4\u56de\u7684\u503c\u548c\u4e0a\u9762\u7684\u542b\u4e49\u4e00\u6837\uff0c\u7565\u8fc7\u4e0d\u63d0\u3002<\/p>\n<p>NOTE\uff1a\u8fd9\u4e24\u4e2a\u547d\u4ee4\u5e76\u4e0d\u662f\u8fde\u7740\u6267\u884c\u7684\uff0c\u4e2d\u95f4\u6211\u6709\u6267\u884c\u5176\u4ed6\u64cd\u4f5c\uff0c\u56e0\u6b64\u00a0<code>index<\/code>\u00a0\u4f1a\u51fa\u73b0\u4e0d\u8fde\u7eed\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u524d\u9762\u5df2\u7ecf\u63d0\u8fc7\uff0c\u00a0<code>PUT<\/code>\u00a0\u4e5f\u53ef\u7528\u6765\u66f4\u65b0 key \u7684\u503c\u6211\u4eec\u5c31\u6765\u770b\u770b\u4f8b\u5b50\u3002<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http PUT http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/message value==\"I'm changed\"<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-Length: <span class=\"hljs-number\">184<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">05<\/span>:<span class=\"hljs-number\">28<\/span>:<span class=\"hljs-number\">17<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">8<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">31407<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"set\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">8<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/message\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">8<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"I'm changed\"<\/span>\r\n    },\r\n    <span class=\"hljs-string\">\"prevNode\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">7<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/message\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">7<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"hello, etcd\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u548c\u7b2c\u4e00\u6b21\u6267\u884c\u00a0<code>PUT<\/code>\u00a0\u547d\u4ee4\u4e0d\u540c\u7684\u662f\uff0c\u8fd4\u56de\u4e2d\u591a\u4e86\u4e00\u4e2a\u5b57\u6bb5\u00a0<code>prevNode<\/code>\uff0c\u5b83\u4fdd\u5b58\u7740\u66f4\u65b0\u4e4b\u524d\u8be5 key \u7684\u4fe1\u606f\u3002\u5b83\u7684\u683c\u5f0f\u548c\u00a0<code>node<\/code>\u00a0\u662f\u4e00\u6837\u7684\uff0c\u5982\u679c\u4e4b\u524d\u6ca1\u6709\u8fd9\u4e2a\u4fe1\u606f\uff0c\u8fd9\u4e2a\u5b57\u6bb5\u4f1a\u88ab\u7701\u7565\u3002<\/p>\n<p>\u5220\u9664 key \u53ef\u4ee5\u901a\u8fc7\u00a0<code>DELETE<\/code>\u00a0\u65b9\u6cd5\uff0c\uff0c\u6bd4\u5982\u6211\u4eec\u8981\u5220\u9664\u4e0a\u9762\u521b\u5efa\u7684\u5b57\u6bb5\uff1a<\/p>\n<pre><code class=\"hljs sql\">\u279c  http <span class=\"hljs-keyword\">DELETE<\/span> <span class=\"hljs-keyword\">http<\/span>:\/\/<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\/<span class=\"hljs-keyword\">keys<\/span>\/message\r\n<span class=\"hljs-keyword\">HTTP<\/span>\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Length<\/span>: <span class=\"hljs-number\">168<\/span>\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Type<\/span>: application\/<span class=\"hljs-keyword\">json<\/span>\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">05<\/span>:<span class=\"hljs-number\">31<\/span>:<span class=\"hljs-number\">56<\/span> GMT\r\nX-Etcd-Cluster-<span class=\"hljs-keyword\">Id<\/span>: cdf818194e3a8c32\r\nX-Etcd-<span class=\"hljs-keyword\">Index<\/span>: <span class=\"hljs-number\">9<\/span>\r\nX-Raft-<span class=\"hljs-keyword\">Index<\/span>: <span class=\"hljs-number\">31847<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"delete\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">8<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/message\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">9<\/span>\r\n    },\r\n    <span class=\"hljs-string\">\"prevNode\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">8<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/message\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">8<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"I'm changed\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u6ce8\u610f\uff0c\u8fd9\u91cc\u7684\u00a0<code>action<\/code>\u00a0\u662f\u00a0<code>delete<\/code>\uff0c\u5e76\u4e14\u00a0<code>modifiedIndex<\/code>\u00a0\u589e\u52a0\u4e86\uff0c\u4f46\u662f\u00a0<code>createdIndex<\/code>\u00a0\u6ca1\u6709\u53d8\u5316\uff0c\u56e0\u4e3a\u8fd9\u662f\u4e00\u4e2a\u4fee\u6539\u64cd\u4f5c\uff0c\u4e0d\u662f\u65b0\u5efa\u64cd\u4f5c\u3002<\/p>\n<h3 id=\"TTL\">TTL<\/h3>\n<p>etcd \u4e2d\uff0ckey \u53ef\u4ee5\u6709 TTL \u5c5e\u6027\uff0c\u8d85\u8fc7\u8fd9\u4e2a\u65f6\u95f4\u4f1a\u88ab\u81ea\u52a8\u5220\u9664\u3002\u6211\u4eec\u6765\u8bbe\u7f6e\u4e00\u4e2a\u770b\u770b\uff1a<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http PUT http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/tempkey value==\"Gone with wind\" ttl==5<\/span>\r\n\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">201<\/span> Created\r\nContent-Length: <span class=\"hljs-number\">159<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">05<\/span>:<span class=\"hljs-number\">48<\/span>:<span class=\"hljs-number\">17<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">10<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">33810<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"set\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">10<\/span>,\r\n        <span class=\"hljs-string\">\"expiration\"<\/span>: <span class=\"hljs-string\">\"2016-08-02T05:48:22.618695843Z\"<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/tempkey\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">10<\/span>,\r\n        <span class=\"hljs-string\">\"ttl\"<\/span>: <span class=\"hljs-number\">5<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"Gone with wind\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u9664\u4e86\u4e00\u822c key \u8fd4\u56de\u7684\u4fe1\u606f\u4e4b\u5916\uff0c\u4e0a\u9762\u591a\u4e86\u4e24\u4e2a\u5b57\u6bb5\uff1a<\/p>\n<ul>\n<li><code>expiration<\/code>\uff1a\u4ee3\u8868 key \u8fc7\u671f\u88ab\u5220\u9664\u7684\u65f6\u95f4<\/li>\n<li><code>ttl<\/code>\uff1a\u8868\u793a key \u8fd8\u8981\u591a\u5c11\u79d2\u53ef\u4ee5\u5b58\u6d3b\uff08\u8fd9\u4e2a\u503c\u662f\u52a8\u6001\u7684\uff0c\u4f1a\u6839\u636e\u4f60\u8bf7\u6c42\u7684\u65f6\u5019\u548c\u8fc7\u671f\u65f6\u95f4\u8fdb\u884c\u8ba1\u7b97\uff09<\/li>\n<\/ul>\n<p>\u5982\u679c\u6211\u4eec\u5728 5s \u4e4b\u540e\u518d\u53bb\u8bf7\u6c42\u67e5\u770b\u8be5 key\uff0c\u4f1a\u53d1\u73b0\u62a5\u9519\u4fe1\u606f\uff1a<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/tempkey<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">404<\/span> Not Found\r\nContent-Length: <span class=\"hljs-number\">74<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">05<\/span>:<span class=\"hljs-number\">48<\/span>:<span class=\"hljs-number\">28<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">11<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"cause\"<\/span>: <span class=\"hljs-string\">\"\/tempkey\"<\/span>,\r\n    <span class=\"hljs-string\">\"errorCode\"<\/span>: <span class=\"hljs-number\">100<\/span>,\r\n    <span class=\"hljs-string\">\"index\"<\/span>: <span class=\"hljs-number\">11<\/span>,\r\n    <span class=\"hljs-string\">\"message\"<\/span>: <span class=\"hljs-string\">\"Key not found\"<\/span>\r\n}\r\n<\/code><\/pre>\n<p>http \u8fd4\u56de\u4e3a\u00a0<code>404<\/code>\uff0c\u5e76\u4e14\u8fd4\u56de\u4f53\u4e2d\u7ed9\u51fa\u4e86\u00a0<code>errorCode<\/code>\u00a0\u548c\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n<p>TTL \u4e5f\u53ef\u901a\u8fc7\u00a0<code>PUT<\/code>\u00a0\u65b9\u6cd5\u8fdb\u884c\u53d6\u6d88\uff0c\u53ea\u8981\u8bbe\u7f6e\u7a7a\u503c\u00a0<code>ttl=<\/code>\u00a0\u5c31\u884c\uff0c\u8fd9\u6837 key \u5c31\u4e0d\u4f1a\u8fc7\u671f\u88ab\u5220\u9664\u3002\u6bd4\u5982\uff1a<\/p>\n<pre><code class=\"hljs ruby\">\u279c  http PUT <span class=\"hljs-symbol\">http:<\/span>\/<span class=\"hljs-regexp\">\/127.0.0.1:2379\/v<\/span>2\/keys\/foo value==bar ttl== prevExist==<span class=\"hljs-literal\">true<\/span>\r\n<\/code><\/pre>\n<p>\u6ce8\u610f\uff1a<strong>\u9700\u8981\u8bbe\u7f6e value==bar\uff0c\u4e0d\u7136 key \u4f1a\u53d8\u6210\u7a7a\u503c\u3002<\/strong><\/p>\n<p>\u5982\u679c\u53ea\u662f\u60f3\u66f4\u65b0 TTL\uff0c\u53ef\u4ee5\u6dfb\u52a0\u4e0a\u00a0<code>refresh==true<\/code>\u00a0\u53c2\u6570\uff1a<\/p>\n<pre><code class=\"hljs javascript\">\u279c  etcd-v3<span class=\"hljs-number\">.0<\/span><span class=\"hljs-number\">.4<\/span>-darwin-amd64 http -v PUT http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/tempkey<\/span>\r\n\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-Length: <span class=\"hljs-number\">305<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">06<\/span>:<span class=\"hljs-number\">05<\/span>:<span class=\"hljs-number\">12<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">20<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">35849<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"set\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">20<\/span>,\r\n        <span class=\"hljs-string\">\"expiration\"<\/span>: <span class=\"hljs-string\">\"2016-08-02T06:13:32.370495212Z\"<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/tempkey\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">20<\/span>,\r\n        <span class=\"hljs-string\">\"ttl\"<\/span>: <span class=\"hljs-number\">500<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"hello, there\"<\/span>\r\n    },\r\n    <span class=\"hljs-string\">\"prevNode\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">19<\/span>,\r\n        <span class=\"hljs-string\">\"expiration\"<\/span>: <span class=\"hljs-string\">\"2016-08-02T06:10:05.366042396Z\"<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/tempkey\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">19<\/span>,\r\n        <span class=\"hljs-string\">\"ttl\"<\/span>: <span class=\"hljs-number\">293<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"hello, there\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3 id=\"\u76d1\u542c\u53d8\u5316\">\u76d1\u542c\u53d8\u5316<\/h3>\n<p>etcd \u63d0\u4f9b\u4e86\u76d1\u542c\u7684\u673a\u5236\uff0c\u53ef\u4ee5\u8ba9\u5ba2\u6237\u7aef\u4f7f\u7528 long pulling \u76d1\u542c\u67d0\u4e2a key\uff0c\u5f53\u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\u63a5\u63a5\u6536\u901a\u77e5\u56e0\u4e3a etcd \u7ecf\u5e38\u88ab\u7528\u4f5c\u670d\u52a1\u53d1\u73b0\uff0c\u96c6\u7fa4\u4e2d\u7684\u4fe1\u606f\u6709\u66f4\u65b0\u7684\u65f6\u5019\u9700\u8981\u53ca\u65f6\u88ab\u68c0\u6d4b\uff0c\u505a\u51fa\u5bf9\u5e94\u7684\u5904\u7406\u3002\u56e0\u6b64\u9700\u8981\u6709\u76d1\u542c\u673a\u5236\uff0c\u6765\u544a\u8bc9\u5ba2\u6237\u7aef\u7279\u5b9a key \u7684\u53d8\u5316\u60c5\u51b5\u3002<\/p>\n<p>\u76d1\u542c\u52a8\u4f5c\u53ea\u9700\u8981\u00a0<code>GET<\/code>\u00a0\u65b9\u6cd5\uff0c\u6dfb\u52a0\u4e0a\u00a0<code>wait=true<\/code>\u00a0\u53c2\u6570\u5c31\u884c.\u4f7f\u7528\u00a0<code>recursive=true<\/code>\u00a0\u53c2\u6570\uff0c\u4e5f\u80fd\u76d1\u542c\u67d0\u4e2a\u76ee\u5f55\u3002<\/p>\n<pre><code class=\"hljs bash\">\u279c  http http:\/\/127.0.0.1:2379\/v2\/keys\/foo <span class=\"hljs-built_in\">wait<\/span>==<span class=\"hljs-literal\">true<\/span>\r\nHTTP\/1.1 200 OK\r\nContent-Type: application\/json\r\nDate: Tue, 02 Aug 2016 06:09:47 GMT\r\nTransfer-Encoding: chunked\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: 22\r\nX-Raft-Index: 36401\r\nX-Raft-Term: 2\r\n<\/code><\/pre>\n<p>\u8fd9\u4e2a\u65f6\u5019\uff0c\u5ba2\u6237\u7aef\u4f1a\u963b\u585e\u5728\u8fd9\u91cc\uff0c\u5982\u679c\u5728\u53e6\u5916\u7684 terminal \u4fee\u6539 key \u7684\u503c\uff0c\u76d1\u542c\u7684\u5ba2\u6237\u7aef\u4f1a\u63a5\u6536\u5230\u6d88\u606f\uff0c\u6253\u5370\u51fa\u66f4\u65b0\u7684\u503c\uff1a<\/p>\n<pre><code class=\"hljs json\">{\r\n    <span class=\"hljs-attr\">\"action\"<\/span>: <span class=\"hljs-string\">\"set\"<\/span>,\r\n    <span class=\"hljs-attr\">\"node\"<\/span>: {\r\n        <span class=\"hljs-attr\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">23<\/span>,\r\n        <span class=\"hljs-attr\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/foo\"<\/span>,\r\n        <span class=\"hljs-attr\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">23<\/span>,\r\n        <span class=\"hljs-attr\">\"value\"<\/span>: <span class=\"hljs-string\">\"changed\"<\/span>\r\n    },\r\n    <span class=\"hljs-attr\">\"prevNode\"<\/span>: {\r\n        <span class=\"hljs-attr\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">22<\/span>,\r\n        <span class=\"hljs-attr\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/foo\"<\/span>,\r\n        <span class=\"hljs-attr\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">22<\/span>,\r\n        <span class=\"hljs-attr\">\"value\"<\/span>: <span class=\"hljs-string\">\"bar\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u9664\u4e86\u8fd9\u79cd\u6700\u7b80\u5355\u7684\u76d1\u542c\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u63d0\u4f9b\u57fa\u4e8e index \u7684\u76d1\u542c\u3002\u5982\u679c\u901a\u8fc7\u00a0<code>waitIndex<\/code>\u00a0\u6307\u5b9a\u4e86 index\uff0c\u90a3\u4e48<\/p>\n<p>\u4f1a\u8fd4\u56de\u4ece index \u5f00\u59cb\u51fa\u73b0\u7684\u7b2c\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u8fd9\u5305\u542b\u4e86\u4e24\u79cd\u60c5\u51b5\uff1a<\/p>\n<ul>\n<li>\u7ed9\u51fa\u7684 index \u5c0f\u4e8e\u7b49\u4e8e\u5f53\u524d index \uff0c\u5373\u4e8b\u4ef6\u5df2\u7ecf\u53d1\u751f\uff0c\u90a3\u4e48\u76d1\u542c\u4f1a\u7acb\u5373\u8fd4\u56de\u8be5\u4e8b\u4ef6<\/li>\n<li>\u7ed9\u51fa\u7684 index \u5927\u4e8e\u5f53\u524d index\uff0c\u7b49\u5f85 index \u4e4b\u540e\u7684\u4e8b\u4ef6\u53d1\u751f\u5e76\u8fd4\u56de<\/li>\n<\/ul>\n<p>\u76ee\u524d etcd \u53ea\u4f1a\u4fdd\u5b58\u6700\u8fd1 1000 \u4e2a\u4e8b\u4ef6\uff08\u6574\u4e2a\u96c6\u7fa4\u8303\u56f4\u5185\uff09\uff0c\u518d\u65e9\u4e4b\u524d\u7684\u4e8b\u4ef6\u4f1a\u88ab\u6e05\u7406\uff0c\u5982\u679c\u76d1\u542c\u88ab\u6e05\u7406\u7684\u4e8b\u4ef6\u4f1a\u62a5\u9519\u3002\u5982\u679c\u51fa\u73b0\u6f0f\u8fc7\u592a\u591a\u4e8b\u4ef6\uff08\u8d85\u8fc7 1000\uff09\u7684\u60c5\u51b5\uff0c\u9700\u8981\u91cd\u65b0\u83b7\u53d6\u5f53\u7136\u7684 index \u503c\uff08<code>X-Etcd-Index<\/code>\uff09\uff0c\u7136\u540e\u4ece\u00a0<code>X-Etcd-Index+1<\/code>\u00a0\u5f00\u59cb\u76d1\u542c\u3002<\/p>\n<p>\u56e0\u4e3a\u76d1\u542c\u7684\u65f6\u5019\u51fa\u73b0\u4e8b\u4ef6\u5c31\u4f1a\u76f4\u63a5\u8fd4\u56de\uff0c\u56e0\u6b64\u9700\u8981\u5ba2\u6237\u7aef\u7f16\u5199\u5faa\u73af\u903b\u8f91\u4fdd\u6301\u76d1\u542c\u72b6\u6001\u3002\u5728\u4e24\u6b21\u76d1\u542c\u7684\u95f4\u9694\u4e2d\u51fa\u73b0\u7684\u4e8b\u4ef6\uff0c\u5f88\u53ef\u80fd\u88ab\u6f0f\u8fc7\u3002\u6240\u4ee5\u6700\u597d\u628a\u4e8b\u4ef6\u5904\u903b\u8f91\u505a\u6210\u5f02\u6b65\u7684\uff0c\u4e0d\u8981\u963b\u585e\u76d1\u542c\u903b\u8f91\u3002<\/p>\n<p>\u6ce8\u610f\uff1a<strong>\u76d1\u542c key \u65f6\u4f1a\u51fa\u73b0\u56e0\u4e3a\u957f\u65f6\u95f4\u6ca1\u6709\u8fd4\u56de\u5bfc\u81f4\u8fde\u63a5\u88ab close \u7684\u60c5\u51b5\uff0c\u5ba2\u6237\u7aef\u9700\u8981\u5904\u7406\u8fd9\u79cd\u9519\u8bef\u5e76\u81ea\u52a8\u91cd\u8bd5\u3002<\/strong><\/p>\n<h3 id=\"\u81ea\u52a8\u521b\u5efa\u6709\u5e8f\u7684-keys\">\u81ea\u52a8\u521b\u5efa\u6709\u5e8f\u7684 keys<\/h3>\n<p>\u5728\u6709\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u9700\u8981 key \u662f\u6709\u5e8f\u7684\uff0cetcd \u63d0\u4f9b\u4e86\u8fd9\u4e2a\u529f\u80fd\u3002\u5bf9\u67d0\u4e2a\u76ee\u5f55\u4f7f\u7528\u00a0<code>POST<\/code>\u00a0\u65b9\u6cd5\uff0c\u80fd\u81ea\u52a8\u751f\u6210\u6709\u5e8f\u7684 key\uff0c\u8fd9\u79cd\u6a21\u5f0f\u53ef\u4ee5\u7528\u4e8e\u961f\u5217\u5904\u7406\u7b49\u573a\u666f\u3002<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http POST http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/queue value==job1<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">201<\/span> Created\r\nContent-Length: <span class=\"hljs-number\">121<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span>:<span class=\"hljs-number\">08<\/span>:<span class=\"hljs-number\">38<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">1030<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">44470<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"create\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\/00000000000000001030\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"job1\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u521b\u5efa\u7684 key \u4f1a\u4f7f\u7528 etcd index\uff0c\u53ea\u80fd\u4fdd\u8bc1\u9012\u589e\uff0c\u65e0\u6cd5\u4fdd\u8bc1\u662f\u8fde\u7eed\u7684\uff08\u56e0\u4e3a\u4e24\u6b21\u521b\u5efa\u4e4b\u95f4\u53ef\u80fd\u4f1a\u6709\u5176\u4ed6\u53d1\u751f\uff09\u3002\u7136\u540e\u7528\u76f8\u540c\u7684\u547d\u4ee4\u521b\u5efa\u591a\u4e2a\u503c\uff0c\u5728\u83b7\u53d6\u503c\u7684\u65f6\u5019\u4f7f\u7528\u00a0<code>sorted=true<\/code>\u53c2\u6570\u5c31\u4f1a\u8fd4\u56de\u5df2\u7ecf\u6392\u5e8f\u7684\u503c\uff1a<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/queue sorted==true<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-Length: <span class=\"hljs-number\">385<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span>:<span class=\"hljs-number\">11<\/span>:<span class=\"hljs-number\">32<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">1032<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">44819<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"get\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n        <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n        <span class=\"hljs-string\">\"nodes\"<\/span>: [\r\n            {\r\n                <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n                <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\/00000000000000001030\"<\/span>,\r\n                <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n                <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"job1\"<\/span>\r\n            },\r\n            {\r\n                <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1031<\/span>,\r\n                <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\/00000000000000001031\"<\/span>,\r\n                <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1031<\/span>,\r\n                <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"job2\"<\/span>\r\n            },\r\n            {\r\n                <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1032<\/span>,\r\n                <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\/00000000000000001032\"<\/span>,\r\n                <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1032<\/span>,\r\n                <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"job3\"<\/span>\r\n            }\r\n        ]\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3 id=\"\u8bbe\u7f6e\u76ee\u5f55\u7684-TTL\">\u8bbe\u7f6e\u76ee\u5f55\u7684 TTL<\/h3>\n<p>\u548c key \u7c7b\u4f3c\uff0c\u76ee\u5f55\uff08dir\uff09\u4e5f\u53ef\u4ee5\u6709\u8fc7\u671f\u65f6\u95f4\u3002\u8bbe\u7f6e\u7684\u65b9\u6cd5\u4e5f\u4e00\u6837\uff0c\u53ea\u4e0d\u8fc7\u591a\u4e86\u00a0<code>dir=true<\/code>\u00a0\u53c2\u6570\u6765\u8bf4\u660e\u8fd9\u662f\u4e00\u4e2a\u76ee\u5f55\u3002<\/p>\n<pre><code class=\"hljs ruby\">\u279c  http PUT <span class=\"hljs-symbol\">http:<\/span>\/<span class=\"hljs-regexp\">\/127.0.0.1:2379\/v<\/span>2\/keys\/dir dir==<span class=\"hljs-literal\">true<\/span> ttl==<span class=\"hljs-number\">5<\/span> prevExist==<span class=\"hljs-literal\">true<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-<span class=\"hljs-symbol\">Length:<\/span> <span class=\"hljs-number\">226<\/span>\r\nContent-<span class=\"hljs-symbol\">Type:<\/span> application\/json\r\n<span class=\"hljs-symbol\">Date:<\/span> Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span><span class=\"hljs-symbol\">:<\/span><span class=\"hljs-number\">15<\/span><span class=\"hljs-symbol\">:<\/span><span class=\"hljs-number\">42<\/span> GMT\r\nX-Etcd-Cluster-<span class=\"hljs-symbol\">Id:<\/span> cdf818194e3a8c32\r\nX-Etcd-<span class=\"hljs-symbol\">Index:<\/span> <span class=\"hljs-number\">1033<\/span>\r\nX-Raft-<span class=\"hljs-symbol\">Index:<\/span> <span class=\"hljs-number\">45325<\/span>\r\nX-Raft-<span class=\"hljs-symbol\">Term:<\/span> <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"update\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1029<\/span>,\r\n        <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n        <span class=\"hljs-string\">\"expiration\"<\/span>: <span class=\"hljs-string\">\"2016-08-02T07:15:47.970434032Z\"<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/dir\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1033<\/span>,\r\n        <span class=\"hljs-string\">\"ttl\"<\/span>: <span class=\"hljs-number\">5<\/span>\r\n    },\r\n    <span class=\"hljs-string\">\"prevNode\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1029<\/span>,\r\n        <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/dir\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1029<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u76ee\u5f55\u8fc7\u671f\u7684\u65f6\u5019\u4f1a\u88ab\u81ea\u52a8\u5220\u9664\uff0c\u5305\u62ec\u5b83\u91cc\u9762\u6240\u6709\u7684\u5b50\u76ee\u5f55\u548c key\uff0c\u6240\u6709\u76d1\u542c\u8fd9\u4e2a\u76ee\u5f55\u4e2d\u5185\u5bb9\u7684\u5ba2\u6237\u7aef\u90fd\u4f1a\u6536\u5230\u5bf9\u5e94\u7684\u4e8b\u4ef6\u3002<\/p>\n<h3 id=\"\u6bd4\u8f83\u66f4\u65b0\u7684\u539f\u5b50\u64cd\u4f5c\">\u6bd4\u8f83\u66f4\u65b0\u7684\u539f\u5b50\u64cd\u4f5c<\/h3>\n<p>\u5728\u5206\u5e03\u5f0f\u73af\u5883\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u89e3\u51b3\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u7ade\u4e89\u95ee\u9898\uff0cetcd \u63d0\u4f9b\u4e86\u539f\u5b50\u64cd\u4f5c\u00a0<code>CompareAndSwap<\/code>\uff08CAS\uff09\uff0c\u901a\u8fc7\u8fd9\u4e2a\u64cd\u4f5c\u53ef\u4ee5\u5f88\u5bb9\u6613\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u3002<\/p>\n<p>\u7b80\u5355\u6765\u8bf4\uff0c\u8fd9\u4e2a\u547d\u4ee4\u53ea\u6709\u5728\u5ba2\u6237\u7aef\u63d0\u4f9b\u7684\u6761\u4ef6\u6210\u7acb\u7684\u60c5\u51b5\u4e0b\u624d\u4f1a\u66f4\u65b0\u5bf9\u5e94\u7684\u503c\u3002\u76ee\u524d\u652f\u6301\u7684\u6761\u4ef6\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>preValue<\/code>\uff1a\u68c0\u67e5 key \u4e4b\u524d\u7684\u503c\u662f\u5426\u548c\u5ba2\u6237\u7aef\u63d0\u4f9b\u7684\u4e00\u81f4<\/li>\n<li><code>prevIndex<\/code>\uff1a\u68c0\u67e5 key \u4e4b\u524d\u7684\u00a0<code>modifiedIndex<\/code>\u00a0\u662f\u5426\u548c\u5ba2\u6237\u7aef\u63d0\u4f9b\u7684\u4e00\u81f4<\/li>\n<li><code>prevExist<\/code>\uff1a\u68c0\u67e5 key \u662f\u5426\u5df2\u7ecf\u5b58\u5728\u3002\u5982\u679c\u5b58\u5728\u5c31\u6267\u884c\u66f4\u65b0\u64cd\u4f5c\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u6267\u884c create \u64cd\u4f5c<\/li>\n<\/ul>\n<p>\u4e3e\u4e2a\u6817\u5b50\uff0c\u6bd4\u5982\u76ee\u524d\u00a0<code>\/foo<\/code>\u00a0\u7684\u503c\u4e3a\u00a0<code>bar<\/code>\uff0c\u8981\u628a\u5b83\u66f4\u65b0\u6210\u00a0<code>changed<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http PUT http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/foo prevValue==bar value==changed<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-Length: <span class=\"hljs-number\">190<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span>:<span class=\"hljs-number\">37<\/span>:<span class=\"hljs-number\">05<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">1036<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">47893<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"compareAndSwap\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1035<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/foo\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1036<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"changed\"<\/span>\r\n    },\r\n    <span class=\"hljs-string\">\"prevNode\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1035<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/foo\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1035<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"bar\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u5982\u679c\u63d0\u4f9b\u7684\u6761\u4ef6\u4e0d\u5bf9\uff0c\u4f1a\u62a5\u00a0<code>412<\/code>\u00a0\u9519\u8bef\uff1a<\/p>\n<pre><code class=\"hljs javascript\">\u279c http PUT http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/foo prevValue==bar value==new<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">412<\/span> Precondition Failed\r\nContent-Length: <span class=\"hljs-number\">85<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span>:<span class=\"hljs-number\">37<\/span>:<span class=\"hljs-number\">38<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">1036<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"cause\"<\/span>: <span class=\"hljs-string\">\"[bar != changed]\"<\/span>,\r\n    <span class=\"hljs-string\">\"errorCode\"<\/span>: <span class=\"hljs-number\">101<\/span>,\r\n    <span class=\"hljs-string\">\"index\"<\/span>: <span class=\"hljs-number\">1036<\/span>,\r\n    <span class=\"hljs-string\">\"message\"<\/span>: <span class=\"hljs-string\">\"Compare failed\"<\/span>\r\n}\r\n<\/code><\/pre>\n<p>\u6ce8\u610f\uff1a\u5339\u914d\u6761\u4ef6\u662f\u00a0<code>prevIndex=0<\/code>\u00a0\u7684\u8bdd\uff0c\u4e5f\u4f1a\u901a\u8fc7\u68c0\u67e5\u3002<\/p>\n<p>\u8fd9\u4e9b\u6761\u4ef6\u4e5f\u53ef\u4ee5\u7ec4\u5408\u8d77\u6765\u4f7f\u7528\uff0c\u53ea\u6709\u5f53\u90fd\u6ee1\u8db3\u7684\u65f6\u5019\uff0c\u624d\u4f1a\u6267\u884c\u5bf9\u5e94\u7684\u64cd\u4f5c\u3002<\/p>\n<h3 id=\"\u6bd4\u8f83\u5220\u9664\u7684\u539f\u5b50\u64cd\u4f5c\">\u6bd4\u8f83\u5220\u9664\u7684\u539f\u5b50\u64cd\u4f5c<\/h3>\n<p>\u548c\u6761\u4ef6\u66f4\u65b0\u7c7b\u4f3c\uff0cetcd \u4e5f\u652f\u6301\u6761\u4ef6\u5220\u9664\u64cd\u4f5c\uff1a\u53ea\u6709\u5728\u5ba2\u6237\u7aef\u63d0\u4f9b\u7684\u6761\u4ef6\u6210\u7acb\u7684\u60c5\u51b5\u4e0b\uff0c\u624d\u4f1a\u6267\u884c\u5220\u9664\u64cd\u4f5c\u3002\u652f\u6301\u00a0<code>prevValue<\/code>\u00a0\u548c\u00a0<code>prevIndex<\/code>\u00a0\u4e24\u79cd\u6761\u4ef6\u68c0\u67e5\uff0c\u6ca1\u6709\u00a0<code>prevExist<\/code>\uff0c\u56e0\u4e3a\u5220\u9664\u4e0d\u5b58\u5728\u7684\u503c\u672c\u8eab\u5c31\u4f1a\u62a5\u9519\u3002<\/p>\n<p>\u6211\u4eec\u6765\u5220\u9664\u4e0a\u9762\u4f8b\u5b50\u4e2d\u66f4\u65b0\u7684\u00a0<code>\/foo<\/code>\u00a0\uff0c\u5148\u770b\u4e00\u4e0b\u63d0\u4f9b\u7684\u6761\u4ef6\u4e0d\u5bf9\u7684\u60c5\u51b5\uff1a<\/p>\n<pre><code class=\"hljs sql\">\u279c  http <span class=\"hljs-keyword\">DELETE<\/span> <span class=\"hljs-keyword\">http<\/span>:\/\/<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\/<span class=\"hljs-keyword\">keys<\/span>\/foo prevValue==bar\r\n<span class=\"hljs-keyword\">HTTP<\/span>\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">412<\/span> Precondition <span class=\"hljs-keyword\">Failed<\/span>\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Length<\/span>: <span class=\"hljs-number\">85<\/span>\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Type<\/span>: application\/<span class=\"hljs-keyword\">json<\/span>\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span>:<span class=\"hljs-number\">49<\/span>:<span class=\"hljs-number\">13<\/span> GMT\r\nX-Etcd-Cluster-<span class=\"hljs-keyword\">Id<\/span>: cdf818194e3a8c32\r\nX-Etcd-<span class=\"hljs-keyword\">Index<\/span>: <span class=\"hljs-number\">1043<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"cause\"<\/span>: <span class=\"hljs-string\">\"[bar != changed]\"<\/span>,\r\n    <span class=\"hljs-string\">\"errorCode\"<\/span>: <span class=\"hljs-number\">101<\/span>,\r\n    <span class=\"hljs-string\">\"index\"<\/span>: <span class=\"hljs-number\">1043<\/span>,\r\n    <span class=\"hljs-string\">\"message\"<\/span>: <span class=\"hljs-string\">\"Compare failed\"<\/span>\r\n}\r\n<\/code><\/pre>\n<p>\u5982\u679c\u63d0\u4f9b\u7684\u6761\u4ef6\u6210\u7acb\uff0c\u5bf9\u5e94\u7684 key \u5c31\u4f1a\u88ab\u5220\u9664\uff1a<\/p>\n<pre><code class=\"hljs sql\">\u279c  http <span class=\"hljs-keyword\">DELETE<\/span> <span class=\"hljs-keyword\">http<\/span>:\/\/<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\/<span class=\"hljs-keyword\">keys<\/span>\/foo prevValue==<span class=\"hljs-keyword\">changed<\/span>\r\n<span class=\"hljs-keyword\">HTTP<\/span>\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Length<\/span>: <span class=\"hljs-number\">178<\/span>\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Type<\/span>: application\/<span class=\"hljs-keyword\">json<\/span>\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span>:<span class=\"hljs-number\">51<\/span>:<span class=\"hljs-number\">27<\/span> GMT\r\nX-Etcd-Cluster-<span class=\"hljs-keyword\">Id<\/span>: cdf818194e3a8c32\r\nX-Etcd-<span class=\"hljs-keyword\">Index<\/span>: <span class=\"hljs-number\">1044<\/span>\r\nX-Raft-<span class=\"hljs-keyword\">Index<\/span>: <span class=\"hljs-number\">49629<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"compareAndDelete\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1043<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/foo\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1044<\/span>\r\n    },\r\n    <span class=\"hljs-string\">\"prevNode\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1043<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/foo\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1043<\/span>,\r\n        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"changed\"<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3 id=\"\u64cd\u4f5c\u76ee\u5f55\">\u64cd\u4f5c\u76ee\u5f55<\/h3>\n<p>\u5728\u521b\u5efa key \u7684\u65f6\u5019\uff0c\u5982\u679c\u5b83\u6240\u5728\u8def\u5f84\u7684\u76ee\u5f55\u4e0d\u5b58\u5728\uff0c\u4f1a\u81ea\u52a8\u88ab\u521b\u5efa\uff0c\u6240\u4ee5\u5728\u591a\u6570\u60c5\u51b5\u4e0b\u6211\u4eec\u4e0d\u9700\u8981\u5173\u5fc3\u76ee\u5f55\u7684\u521b\u5efa\u3002\u76ee\u5f55\u7684\u64cd\u4f5c\u548c key \u7684\u64cd\u4f5c\u57fa\u672c\u4e00\u81f4\uff0c\u552f\u4e00\u7684\u533a\u522b\u662f\u9700\u8981\u52a0\u4e0a\u00a0<code>dir=true<\/code>\u00a0\u53c2\u6570\u6307\u660e\u64cd\u4f5c\u7684\u5bf9\u8c61\u662f\u76ee\u5f55\u3002<\/p>\n<p>\u6bd4\u5982\uff0c\u5982\u679c\u60f3\u8981\u663e\u793a\u5730\u521b\u5efa\u76ee\u5f55\uff0c\u53ef\u4ee5\u4f7f\u7528\u00a0<code>PUT<\/code>\u00a0\u65b9\u6cd5\uff0c\u5e76\u8bbe\u7f6e\u00a0<code>dir=true<\/code>\uff1a<\/p>\n<pre><code class=\"hljs javascript\">\u279c http PUT http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/anotherdir dir==true<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">201<\/span> Created\r\nContent-Length: <span class=\"hljs-number\">98<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span>:<span class=\"hljs-number\">53<\/span>:<span class=\"hljs-number\">48<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">1045<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">49914<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"set\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1045<\/span>,\r\n        <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/anotherdir\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1045<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u521b\u5efa\u76ee\u5f55\u7684\u64cd\u4f5c\u4e0d\u80fd\u91cd\u590d\u6267\u884c\uff0c\u518d\u6b21\u6267\u884c\u4e0a\u9762\u7684\u547d\u4ee4\u4f1a\u62a5\u00a0<code>HTTP 403<\/code>\u00a0\u9519\u8bef\u3002<\/p>\n<p>\u5982\u679c\u00a0<code>GET<\/code>\u00a0\u65b9\u6cd5\u5bf9\u5e94\u7684 url \u662f\u76ee\u5f55\u7684\u8bdd\uff0cetcd \u4f1a\u5217\u51fa\u8be5\u76ee\u5f55\u6240\u6709\u8282\u70b9\u7684\u4fe1\u606f\uff08\u4e0d\u9700\u8981\u6307\u5b9a\u00a0<code>dir=true<\/code>\uff09\u3002\u6bd4\u5982\u8981\u5217\u51fa\u6839\u76ee\u5f55\u4e0b\u6240\u6709\u7684\u8282\u70b9\uff1a<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/keys\/<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-Length: <span class=\"hljs-number\">190<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span>:<span class=\"hljs-number\">55<\/span>:<span class=\"hljs-number\">41<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">1045<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">50141<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"get\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n        <span class=\"hljs-string\">\"nodes\"<\/span>: [\r\n            {\r\n                <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1045<\/span>,\r\n                <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n                <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/anotherdir\"<\/span>,\r\n                <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1045<\/span>\r\n            },\r\n            {\r\n                <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n                <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n                <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\"<\/span>,\r\n                <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>\r\n            }\r\n        ]\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6dfb\u52a0\u4e0a\u00a0<code>recursive=true<\/code>\u00a0\u53c2\u6570\uff0c\u5c31\u4f1a\u9012\u5f52\u5730\u5217\u51fa\u6240\u6709\u7684\u503c\uff1a<\/p>\n<pre><code class=\"hljs coffeescript\">\u279c  http http:<span class=\"hljs-regexp\">\/\/<\/span><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<span class=\"hljs-regexp\">\/keys\/<\/span>\\?recursive\\=<span class=\"hljs-literal\">true<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-Length: <span class=\"hljs-number\">482<\/span>\r\nContent-Type: application\/json\r\nDate: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">07<\/span>:<span class=\"hljs-number\">57<\/span>:<span class=\"hljs-number\">48<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\nX-Etcd-Index: <span class=\"hljs-number\">1045<\/span>\r\nX-Raft-Index: <span class=\"hljs-number\">50394<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"get\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n        <span class=\"hljs-string\">\"nodes\"<\/span>: [\r\n            {\r\n                <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1045<\/span>,\r\n                <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n                <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/anotherdir\"<\/span>,\r\n                <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1045<\/span>\r\n            },\r\n            {\r\n                <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n                <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n                <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\"<\/span>,\r\n                <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n                <span class=\"hljs-string\">\"nodes\"<\/span>: [\r\n                    {\r\n                        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1031<\/span>,\r\n                        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\/00000000000000001031\"<\/span>,\r\n                        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1031<\/span>,\r\n                        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"job2\"<\/span>\r\n                    },\r\n                    {\r\n                        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1032<\/span>,\r\n                        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\/00000000000000001032\"<\/span>,\r\n                        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1032<\/span>,\r\n                        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"job3\"<\/span>\r\n                    },\r\n                    {\r\n                        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n                        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\/00000000000000001030\"<\/span>,\r\n                        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n                        <span class=\"hljs-string\">\"value\"<\/span>: <span class=\"hljs-string\">\"job1\"<\/span>\r\n                    }\r\n                ]\r\n            }\r\n        ]\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u548c linux \u5220\u9664\u76ee\u5f55\u7684\u8bbe\u8ba1\u4e00\u6837\uff0c\u8981\u533a\u522b\u7a7a\u76ee\u5f55\u548c\u975e\u7a7a\u76ee\u5f55\u3002\u5220\u9664\u7a7a\u76ee\u5f55\u5f88\u7b80\u5355\uff0c\u4f7f\u7528\u00a0<code>DELETE<\/code>\u00a0\u65b9\u6cd5\uff0c\u5e76\u6dfb\u52a0\u4e0a\u00a0<code>dir=true<\/code>\u00a0\u53c2\u6570\uff0c\u7c7b\u4f3c\u4e8e\u00a0<code>rmdir<\/code>\uff1b\u800c\u5bf9\u4e8e\u975e\u7a7a\u76ee\u5f55\uff0c\u9700\u8981\u6dfb\u52a0\u4e0a\u00a0<code>recursive=true<\/code>\uff0c\u7c7b\u4f3c\u4e8e\u00a0<code>rm -rf<\/code>\u3002<\/p>\n<pre><code class=\"hljs sql\">\u279c  http <span class=\"hljs-keyword\">DELETE<\/span> <span class=\"hljs-keyword\">http<\/span>:\/\/<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\/<span class=\"hljs-keyword\">keys<\/span>\/queue dir==<span class=\"hljs-literal\">true<\/span>\r\n<span class=\"hljs-keyword\">HTTP<\/span>\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">403<\/span> Forbidden\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Length<\/span>: <span class=\"hljs-number\">80<\/span>\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Type<\/span>: application\/<span class=\"hljs-keyword\">json<\/span>\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">08<\/span>:<span class=\"hljs-number\">06<\/span>:<span class=\"hljs-number\">44<\/span> GMT\r\nX-Etcd-Cluster-<span class=\"hljs-keyword\">Id<\/span>: cdf818194e3a8c32\r\nX-Etcd-<span class=\"hljs-keyword\">Index<\/span>: <span class=\"hljs-number\">1045<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"cause\"<\/span>: <span class=\"hljs-string\">\"\/queue\"<\/span>,\r\n    <span class=\"hljs-string\">\"errorCode\"<\/span>: <span class=\"hljs-number\">108<\/span>,\r\n    <span class=\"hljs-string\">\"index\"<\/span>: <span class=\"hljs-number\">1045<\/span>,\r\n    <span class=\"hljs-string\">\"message\"<\/span>: <span class=\"hljs-string\">\"Directory not empty\"<\/span>\r\n}\r\n\r\n\u279c  <span class=\"hljs-keyword\">http<\/span> <span class=\"hljs-keyword\">DELETE<\/span> <span class=\"hljs-keyword\">http<\/span>:\/\/<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\/<span class=\"hljs-keyword\">keys<\/span>\/queue dir==<span class=\"hljs-literal\">true<\/span> <span class=\"hljs-keyword\">recursive<\/span>==<span class=\"hljs-literal\">true<\/span>\r\n<span class=\"hljs-keyword\">HTTP<\/span>\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Length<\/span>: <span class=\"hljs-number\">176<\/span>\r\n<span class=\"hljs-keyword\">Content<\/span>-<span class=\"hljs-keyword\">Type<\/span>: application\/<span class=\"hljs-keyword\">json<\/span>\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">08<\/span>:<span class=\"hljs-number\">06<\/span>:<span class=\"hljs-number\">48<\/span> GMT\r\nX-Etcd-Cluster-<span class=\"hljs-keyword\">Id<\/span>: cdf818194e3a8c32\r\nX-Etcd-<span class=\"hljs-keyword\">Index<\/span>: <span class=\"hljs-number\">1046<\/span>\r\nX-Raft-<span class=\"hljs-keyword\">Index<\/span>: <span class=\"hljs-number\">51478<\/span>\r\nX-Raft-Term: <span class=\"hljs-number\">2<\/span>\r\n\r\n{\r\n    <span class=\"hljs-string\">\"action\"<\/span>: <span class=\"hljs-string\">\"delete\"<\/span>,\r\n    <span class=\"hljs-string\">\"node\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n        <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1046<\/span>\r\n    },\r\n    <span class=\"hljs-string\">\"prevNode\"<\/span>: {\r\n        <span class=\"hljs-string\">\"createdIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>,\r\n        <span class=\"hljs-string\">\"dir\"<\/span>: <span class=\"hljs-literal\">true<\/span>,\r\n        <span class=\"hljs-string\">\"key\"<\/span>: <span class=\"hljs-string\">\"\/queue\"<\/span>,\r\n        <span class=\"hljs-string\">\"modifiedIndex\"<\/span>: <span class=\"hljs-number\">1030<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3 id=\"\u9690\u85cf\u7684\u8282\u70b9\">\u9690\u85cf\u7684\u8282\u70b9<\/h3>\n<p>etcd \u4e2d\u8282\u70b9\u4e5f\u53ef\u4ee5\u662f\u9ed8\u8ba4\u9690\u85cf\u7684\uff0c\u7c7b\u4f3c\u4e8e linux \u4e2d\u4ee5\u00a0<code>.<\/code>\u00a0\u5f00\u5934\u7684\u6587\u4ef6\u6216\u8005\u6587\u4ef6\u5939\uff0c\u4ee5\u00a0<code>_<\/code>\u00a0\u5f00\u5934\u7684\u8282\u70b9\u4e5f\u662f\u9ed8\u8ba4\u9690\u85cf\u7684\uff0c\u4e0d\u4f1a\u5728\u5217\u51fa\u76ee\u5f55\u7684\u65f6\u5019\u663e\u793a\u3002\u53ea\u6709\u77e5\u9053\u9690\u85cf\u8282\u70b9\u7684\u5b8c\u6574\u8def\u5f84\uff0c\u624d\u80fd\u591f\u8bbf\u95ee\u5b83\u7684\u4fe1\u606f\u3002<\/p>\n<h3 id=\"\u67e5\u770b\u96c6\u7fa4\u6570\u636e\u4fe1\u606f\">\u67e5\u770b\u96c6\u7fa4\u6570\u636e\u4fe1\u606f<\/h3>\n<p>etcd \u8fd8\u4fdd\u5b58\u4e86\u96c6\u7fa4\u7684\u6570\u636e\u4fe1\u606f\uff0c\u5305\u62ec\u8282\u70b9\u4e4b\u95f4\u7684\u7f51\u7edc\u4fe1\u606f\uff0c\u64cd\u4f5c\u7684\u7edf\u8ba1\u4fe1\u606f\u3002<\/p>\n<ul>\n<li><code>\/v2\/stats\/leader<\/code>\u4f1a\u8fd4\u56de\u96c6\u7fa4\u4e2d leader \u7684\u4fe1\u606f\uff0c\u4ee5\u53ca followers \u7684\u57fa\u672c\u4fe1\u606f<\/li>\n<li><code>\/v2\/stats\/self<\/code>\u00a0\u4f1a\u8fd4\u56de\u5f53\u524d\u8282\u70b9\u7684\u4fe1\u606f<\/li>\n<li><code>\/v2\/state\/store<\/code>\uff1a\u4f1a\u8fd4\u56de\u5404\u79cd\u547d\u4ee4\u7684\u7edf\u8ba1\u4fe1\u606f<\/li>\n<\/ul>\n<h3 id=\"\u6210\u5458\u7ba1\u7406\">\u6210\u5458\u7ba1\u7406<\/h3>\n<p>etcd \u5728\u00a0<code>\/v2\/members<\/code>\u00a0\u4e0b\u4fdd\u5b58\u7740\u96c6\u7fa4\u4e2d\u5404\u4e2a\u6210\u5458\u7684\u4fe1\u606f\uff0c<\/p>\n<pre><code class=\"hljs javascript\">\u279c  http http:<span class=\"hljs-comment\">\/\/127.0.0.1:2379\/v2\/members<\/span>\r\nHTTP\/<span class=\"hljs-number\">1.1<\/span> <span class=\"hljs-number\">200<\/span> OK\r\nContent-Length: <span class=\"hljs-number\">133<\/span>\r\nContent-Type: application\/json\r\n<span class=\"hljs-built_in\">Date<\/span>: Tue, <span class=\"hljs-number\">02<\/span> Aug <span class=\"hljs-number\">2016<\/span> <span class=\"hljs-number\">08<\/span>:<span class=\"hljs-number\">15<\/span>:<span class=\"hljs-number\">56<\/span> GMT\r\nX-Etcd-Cluster-Id: cdf818194e3a8c32\r\n\r\n{\r\n    <span class=\"hljs-string\">\"members\"<\/span>: [\r\n        {\r\n            <span class=\"hljs-string\">\"clientURLs\"<\/span>: [\r\n                <span class=\"hljs-string\">\"http:\/\/localhost:2379\"<\/span>\r\n            ],\r\n            <span class=\"hljs-string\">\"id\"<\/span>: <span class=\"hljs-string\">\"8e9e05c52164694d\"<\/span>,\r\n            <span class=\"hljs-string\">\"name\"<\/span>: <span class=\"hljs-string\">\"default\"<\/span>,\r\n            <span class=\"hljs-string\">\"peerURLs\"<\/span>: [\r\n                <span class=\"hljs-string\">\"http:\/\/localhost:2380\"<\/span>\r\n            ]\r\n        }\r\n    ]\r\n}\r\n<\/code><\/pre>\n<p>\u53ef\u4ee5\u901a\u8fc7\u00a0<code>POST<\/code>\u00a0\u65b9\u6cd5\u6dfb\u52a0\u6210\u5458\uff1a<\/p>\n<pre><code class=\"hljs nginx\"><span class=\"hljs-attribute\">curl<\/span> http:\/\/10.0.0.10:2379\/v2\/members -XPOST \\\r\n-H <span class=\"hljs-string\">\"Content-Type: application\/json\"<\/span> -d <span class=\"hljs-string\">'{\"peerURLs\":[\"http:\/\/10.0.0.10:2380\"]}'<\/span>\r\n<\/code><\/pre>\n<p>\u4e5f\u53ef\u4ee5\u901a\u8fc7\u00a0<code>DELETE<\/code>\u00a0\u65b9\u6cd5\u5220\u9664\u6210\u5458\uff1a<\/p>\n<pre><code class=\"hljs nginx\"><span class=\"hljs-attribute\">curl<\/span> http:\/\/10.0.0.10:2379\/v2\/members\/272e204152 -XDELETE\r\n<\/code><\/pre>\n<p>\u6216\u8005\u901a\u8fc7 PUT \u66f4\u65b0\u6210\u5458\u7684 peer url\uff1a<\/p>\n<pre><code class=\"hljs nginx\"><span class=\"hljs-attribute\">curl<\/span> http:\/\/10.0.0.10:2379\/v2\/members\/272e204152 -XPUT \\\r\n-H <span class=\"hljs-string\">\"Content-Type: application\/json\"<\/span> -d <span class=\"hljs-string\">'{\"peerURLs\":[\"http:\/\/10.0.0.10:2380\"]}'<\/span>\r\n<\/code><\/pre>\n<h2 id=\"5-etcdctl-\u547d\u4ee4\u884c\u5de5\u5177\">5. etcdctl \u547d\u4ee4\u884c\u5de5\u5177<\/h2>\n<p>\u9664\u4e86 HTTP API \u5916\uff0cetcd \u8fd8\u63d0\u4f9b\u4e86\u00a0<code>etcdctl<\/code>\u00a0\u547d\u4ee4\u884c\u5de5\u5177\u548c etcd \u670d\u52a1\u4ea4\u4e92\u3002\u8fd9\u4e2a\u547d\u4ee4\u884c\u7528 go \u8bed\u8a00\u7f16\u5199\uff0c\u4e5f\u662f\u5bf9 HTTP API \u7684\u5c01\u88c5\uff0c\u65e5\u5e38\u4f7f\u7528\u8d77\u6765\u4e5f\u66f4\u5bb9\u6613\u3002<\/p>\n<p>etcdctl \u7684\u5b89\u88c5\u5c31\u4e0d\u8bf4\u4e86\uff0c\u4ece\u5b98\u7f51\u4e0b\u8f7d\u4e8c\u8fdb\u5236\u6587\u4ef6\u653e\u5230\u7cfb\u7edf\u7684 PATH \u8def\u5f84\u4e0b\u5c31\u884c\u4e86\u3002<\/p>\n<pre><code class=\"hljs cs\"><span class=\"hljs-meta\"># \u8bbe\u7f6e\u4e00\u4e2a key \u7684\u503c<\/span>\r\n\u279c .\/etcdctl <span class=\"hljs-keyword\">set<\/span> \/message <span class=\"hljs-string\">\"hello, etcd\"<\/span>\r\nhello, etcd\r\n\r\n<span class=\"hljs-meta\"># \u83b7\u53d6 key \u7684\u503c<\/span>\r\n\u279c .\/etcdctl <span class=\"hljs-keyword\">get<\/span> \/message\r\nhello, etcd\r\n\r\n<span class=\"hljs-meta\"># \u83b7\u53d6 key \u7684\u503c\uff0c\u5305\u542b\u66f4\u8be6\u7ec6\u7684\u5143\u6570\u636e<\/span>\r\n\u279c  .\/etcdctl -o extended <span class=\"hljs-keyword\">get<\/span> \/message\r\nKey: \/message\r\nCreated-Index: <span class=\"hljs-number\">1073<\/span>\r\nModified-Index: <span class=\"hljs-number\">1073<\/span>\r\nTTL: <span class=\"hljs-number\">0<\/span>\r\nIndex: <span class=\"hljs-number\">1073<\/span>\r\n\r\nhello, etcd\r\n\r\n<span class=\"hljs-meta\"># \u83b7\u53d6\u4e0d\u5b58\u5728 key \u7684\u503c\uff0c\u4f1a\u62a5\u9519<\/span>\r\n\u279c  .\/etcdctl <span class=\"hljs-keyword\">get<\/span> \/notexist\r\nError:  <span class=\"hljs-number\">100<\/span>: <span class=\"hljs-function\">Key not <span class=\"hljs-title\">found<\/span> (<span class=\"hljs-params\">\/notexist<\/span>) [1048]\r\n\r\n# \u8bbe\u7f6e key \u7684 ttl\uff0c\u8fc7\u671f\u540e\u4f1a\u88ab\u81ea\u52a8\u5220\u9664\r\n\u279c  .\/etcdctl <span class=\"hljs-keyword\">set<\/span> \/tempkey \"gone with wind\" --ttl 5\r\ngone with wind\r\n\u279c  .\/etcdctl <span class=\"hljs-keyword\">get<\/span> \/tempkey\r\ngone with wind\r\n\u279c  .\/etcdctl <span class=\"hljs-keyword\">get<\/span> \/tempkey\r\nError:  100: Key not <span class=\"hljs-title\">found<\/span> (<span class=\"hljs-params\">\/tempkey<\/span>) [1050]\r\n\r\n# \u5982\u679c key \u7684\u503c\u662f \"hello, etcd\"\uff0c\u5c31\u628a\u5b83\u66ff\u6362\u4e3a \"goodbye, etcd\"\r\n\u279c  .\/etcdctl <span class=\"hljs-keyword\">set<\/span> --swap-with-<span class=\"hljs-keyword\">value<\/span> \"hello, world\" \/message \"goodbye, etcd\"\r\nError:  101: Compare <span class=\"hljs-title\">failed<\/span> (<span class=\"hljs-params\">[hello, world != hello, etcd]<\/span>) [1050]\r\n\u279c  .\/etcdctl <span class=\"hljs-keyword\">set<\/span> --swap-with-<span class=\"hljs-keyword\">value<\/span> \"hello, etcd\" \/message \"goodbye, etcd\"\r\ngoodbye, etcd\r\n\r\n# \u4ec5\u5f53 key \u4e0d\u5b58\u5728\u7684\u65f6\u5019\u521b\u5efa\r\n\u279c  .\/etcdctl mk \/foo bar\r\nbar\r\n\u279c  .\/etcdctl mk \/foo bar\r\nError:  105: Key already <span class=\"hljs-title\">exists<\/span> (<span class=\"hljs-params\">\/foo<\/span>) [1052]\r\n\r\n# \u81ea\u52a8\u521b\u5efa\u6392\u5e8f\u7684 key\r\n\u279c  .\/etcdctl mk --<span class=\"hljs-keyword\">in<\/span>-order \/queue job1\r\njob1\r\n\u279c  .\/etcdctl mk --<span class=\"hljs-keyword\">in<\/span>-order \/queue job2\r\njob2\r\n\u279c  .\/etcdctl ls --sort \/queue\r\n\/queue\/00000000000000001053\r\n\/queue\/00000000000000001054\r\n\r\n# \u66f4\u65b0 key \u7684\u503c\u6216\u8005 ttl\uff0c\u53ea\u6709\u5f53 key \u5df2\u7ecf\u5b58\u5728\u7684\u65f6\u5019\u624d\u4f1a\u751f\u6548\uff0c\u5426\u5219\u62a5\u9519\r\n\u279c  .\/etcdctl update \/message \"I'am changed\"\r\nI'am changed\r\n\u279c  .\/etcdctl <span class=\"hljs-keyword\">get<\/span> \/message\r\nI'am changed\r\n\u279c  .\/etcdctl update \/notexist \"I'am changed\"\r\nError:  100: Key not <span class=\"hljs-title\">found<\/span> (<span class=\"hljs-params\">\/notexist<\/span>) [1055]\r\n\u279c  .\/etcdctl update --ttl 3 \/message \"I'am changed\"\r\nI'am changed\r\n\u279c  .\/etcdctl <span class=\"hljs-keyword\">get<\/span> \/message\r\nError:  100: Key not <span class=\"hljs-title\">found<\/span> (<span class=\"hljs-params\">\/message<\/span>) [1057]\r\n\r\n# \u5220\u9664\u67d0\u4e2a key\r\n\u279c  .\/etcdctl mk \/foo bar\r\nbar\r\n\u279c  .\/etcdctl rm \/foo\r\nPrevNode.Value: bar\r\n\u279c  .\/etcdctl <span class=\"hljs-keyword\">get<\/span> \/foo\r\nError:  100: Key not <span class=\"hljs-title\">found<\/span> (<span class=\"hljs-params\">\/foo<\/span>) [1062]\r\n\r\n# \u53ea\u6709\u5f53 key \u7684\u503c\u5339\u914d\u7684\u65f6\u5019\uff0c\u624d\u8fdb\u884c\u5220\u9664\r\n\u279c  .\/etcdctl mk \/foo bar\r\nbar\r\n\u279c  .\/etcdctl rm --with-<span class=\"hljs-keyword\">value<\/span> wrong \/foo\r\nError:  101: Compare <span class=\"hljs-title\">failed<\/span> (<span class=\"hljs-params\">[wrong != bar]<\/span>) [1063]\r\n\u279c  .\/etcdctl rm --with-<span class=\"hljs-keyword\">value<\/span> bar \/foo\r\n\r\n# \u521b\u5efa\u4e00\u4e2a\u76ee\u5f55\r\n\u279c  .\/etcdctl mkdir \/dir\r\n\r\n# \u5220\u9664\u7a7a\u76ee\u5f55\r\n\u279c  .\/etcdctl mkdir \/dir\/subdir\/\r\n\u279c  .\/etcdctl rmdir \/dir\/subdir\/\r\n\r\n# \u5220\u9664\u975e\u7a7a\u76ee\u5f55\r\n\u279c  .\/etcdctl rmdir \/dir\r\nError:  108: Directory not <span class=\"hljs-title\">empty<\/span> (<span class=\"hljs-params\">\/dir<\/span>) [1071]\r\n\u279c  .\/etcdctl rm --recursive \/dir\r\n\r\n# \u5217\u51fa\u76ee\u5f55\u7684\u5185\u5bb9\r\n\u279c  .\/etcdctl ls \/\r\n\/queue\r\n\/anotherdir\r\n\/message\r\n\r\n# \u9012\u5f52\u5217\u51fa\u76ee\u5f55\u7684\u5185\u5bb9\r\n\u279c  .\/etcdctl ls --recursive \/\r\n\/anotherdir\r\n\/message\r\n\/queue\r\n\/queue\/00000000000000001053\r\n\/queue\/00000000000000001054\r\n\r\n# \u76d1\u542c\u67d0\u4e2a key\uff0c\u5f53 key \u6539\u53d8\u7684\u65f6\u5019\u4f1a\u6253\u5370\u51fa\u53d8\u5316\r\n\u279c  .\/etcdctl watch \/message\r\nchanged\r\n\r\n# \u76d1\u542c\u67d0\u4e2a\u76ee\u5f55\uff0c\u5f53\u76ee\u5f55\u4e2d\u4efb\u4f55 node \u6539\u53d8\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u6253\u5370\u51fa\u6765\r\n\u279c  .\/etcdctl watch --recursive \/\r\n[<span class=\"hljs-keyword\">set<\/span>] \/message\r\nchanged\r\n\r\n# \u4e00\u76f4\u76d1\u542c\uff0c\u9664\u975e `CTL + C` \u5bfc\u81f4\u9000\u51fa\u76d1\u542c\r\n\u279c  .\/etcdctl watch --forever \/message\r\nnew <span class=\"hljs-keyword\">value<\/span>\r\nchaned again\r\nWola\r\n\r\n# \u76d1\u542c\u76ee\u5f55\uff0c\u5e76\u5728\u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\u6267\u884c\u4e00\u4e2a\u547d\u4ee4\r\n\u279c  .\/etcdctl exec-watch --recursive \/ -- sh -c \"echo change detected.\"\r\nchange detected.\r\nchange detected.\r\n<\/span><\/code><\/pre>\n<h2 id=\"6-\u603b\u7ed3\">6. \u603b\u7ed3<\/h2>\n<p>etcd \u9ed8\u8ba4\u53ea\u4fdd\u5b58 1000 \u4e2a\u5386\u53f2\u4e8b\u4ef6\uff0c\u6240\u4ee5\u4e0d\u9002\u5408\u6709\u5927\u91cf\u66f4\u65b0\u64cd\u4f5c\u7684\u573a\u666f\uff0c\u8fd9\u6837\u4f1a\u5bfc\u81f4\u6570\u636e\u7684\u4e22\u5931\u3002 etcd \u5178\u578b\u7684\u5e94\u7528\u573a\u666f\u662f\u914d\u7f6e\u7ba1\u7406\u548c\u670d\u52a1\u53d1\u73b0\uff0c\u8fd9\u4e9b\u573a\u666f\u90fd\u662f\u8bfb\u591a\u5199\u5c11\u7684\u3002<\/p>\n<p>\u76f8\u6bd4\u4e8e zookeeper\uff0cetcd \u4f7f\u7528\u8d77\u6765\u8981\u7b80\u5355\u5f88\u591a\u3002\u4e0d\u8fc7\u8981\u5b9e\u73b0\u771f\u6b63\u7684\u670d\u52a1\u53d1\u73b0\u529f\u80fd\uff0cetcd \u8fd8\u9700\u8981\u548c\u5176\u4ed6\u5de5\u5177\uff08\u6bd4\u5982 registrator\u3001confd \u7b49\uff09\u4e00\u8d77\u4f7f\u7528\u6765\u5b9e\u73b0\u670d\u52a1\u7684\u81ea\u52a8\u6ce8\u518c\u548c\u66f4\u65b0\u3002<\/p>\n<p>\u76ee\u524d etcd \u8fd8\u6ca1\u6709\u56fe\u5f62\u5316\u7684\u5de5\u5177\u3002<\/p>\n<h2 id=\"7-\u53c2\u8003\u8d44\u6599\">7. \u53c2\u8003\u8d44\u6599<\/h2>\n<ul>\n<li><a href=\"http:\/\/www.infoq.com\/cn\/articles\/coreos-analyse-etcd\" target=\"_blank\" rel=\"noopener\">CoreOS \u5b9e\u6218\uff1a\u5256\u6790 etcd<\/a><\/li>\n<li><a href=\"http:\/\/www.csdn.net\/article\/2015-01-22\/2823659\" target=\"_blank\" rel=\"noopener\">CoreOS\u5b9e\u8df5\u6307\u5357\uff08\u4e94\uff09\uff1a\u5206\u5e03\u5f0f\u6570\u636e\u5b58\u50a8Etcd\uff08\u4e0a\uff09<\/a><\/li>\n<li><a href=\"http:\/\/www.csdn.net\/article\/2015-01-28\/2823739\" target=\"_blank\" rel=\"noopener\">CoreOS\u5b9e\u8df5\u6307\u5357\uff08\u516d\uff09\uff1a\u5206\u5e03\u5f0f\u6570\u636e\u5b58\u50a8Etcd\uff08\u4e0b\uff09<\/a><\/li>\n<li><a href=\"https:\/\/coreos.com\/etcd\/docs\/latest\/api.html\" target=\"_blank\" rel=\"noopener\">etcd API document<\/a><\/li>\n<li><a href=\"https:\/\/coreos.com\/etcd\/docs\/latest\/members_api.html\" target=\"_blank\" rel=\"noopener\">etcd members API document<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/coreos\/etcd\/blob\/master\/Documentation\/op-guide\/configuration.md\" target=\"_blank\" rel=\"noopener\">etcd configuration<\/a><\/li>\n<\/ul>\n<\/div>\n<\/section>\n<\/article>\n<\/div>\n<nav class=\"pagination\"><a class=\"prev-post\" title=\"go http \u670d\u52a1\u5668\u7f16\u7a0b\" href=\"https:\/\/cizixs.com\/2016\/08\/17\/golang-http-server-side\/\">\u2190 go http \u670d\u52a1\u5668\u7f16\u7a0b<\/a><span class=\"prev-next-post\">\u2022<\/span><\/nav>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740 &nbsp; 1. etcd <\/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-5388","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5388","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=5388"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5388\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=5388"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=5388"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=5388"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}