{"id":941,"date":"2017-09-02T20:23:39","date_gmt":"2017-09-02T12:23:39","guid":{"rendered":"https:\/\/www.ipcpu.com\/?p=941"},"modified":"2017-09-02T20:23:39","modified_gmt":"2017-09-02T12:23:39","slug":"etcd-start","status":"publish","type":"post","link":"https:\/\/c.ipcpu.com\/2017\/09\/etcd-start\/","title":{"rendered":"Etcd\u7b80\u4ecb\u3001\u67b6\u6784\u548c\u5de5\u4f5c\u539f\u7406"},"content":{"rendered":"

etcd\u7b80\u4ecb\u3001\u67b6\u6784.md<\/p>\n

\u4e00\u3001etcd\u7b80\u4ecb<\/h2>\n

etcd \u662f CoreOS \u56e2\u961f\u4e8e 2013 \u5e74 6 \u6708\u53d1\u8d77\u7684\u5f00\u6e90\u9879\u76ee\uff0c\u5b83\u7684\u76ee\u6807\u662f\u6784\u5efa\u4e00\u4e2a\u9ad8\u53ef\u7528\u7684\u5206\u5e03\u5f0f\u952e\u503c\uff08key-value\uff09\u6570\u636e\u5e93\uff0c\u57fa\u4e8e Go \u8bed\u8a00\u5b9e\u73b0\u3002\u5b98\u65b9\u63cf\u8ff0\uff1a<\/p>\n

\n

etcd is a distributed, consistent key-value store for shared configuration and service discovery.<\/p>\n

etcd\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u7684\uff0c\u4e00\u81f4\u7684 key-value \u5b58\u50a8\uff0c\u4e3b\u8981\u7528\u9014\u662f\u5171\u4eab\u914d\u7f6e\u548c\u670d\u52a1\u53d1\u73b0\u3002<\/p>\n<\/blockquote>\n

\u4e8c\u3001Ectd\u67b6\u6784<\/h2>\n

<\/p>\n

etcd \u4e3b\u8981\u5206\u4e3a\u56db\u4e2a\u90e8\u5206\u3002<\/p>\n

HTTP Server<\/h4>\n

\u7528\u4e8e\u5904\u7406\u7528\u6237\u53d1\u9001\u7684 API \u8bf7\u6c42\u4ee5\u53ca\u5176\u5b83 etcd \u8282\u70b9\u7684\u540c\u6b65\u4e0e\u5fc3\u8df3\u4fe1\u606f\u8bf7\u6c42\u3002<\/p>\n

Store<\/h4>\n

\u7528\u4e8e\u5904\u7406 etcd \u652f\u6301\u7684\u5404\u7c7b\u529f\u80fd\u7684\u4e8b\u52a1\uff0c\u5305\u62ec\u6570\u636e\u7d22\u5f15\u3001\u8282\u70b9\u72b6\u6001\u53d8\u66f4\u3001\u76d1\u63a7\u4e0e\u53cd\u9988\u3001\u4e8b\u4ef6\u5904\u7406\u4e0e\u6267\u884c\u7b49\u7b49\uff0c\u662f etcd \u5bf9\u7528\u6237\u63d0\u4f9b\u7684\u5927\u591a\u6570 API \u529f\u80fd\u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n

Raft<\/h4>\n

Raft \u5f3a\u4e00\u81f4\u6027\u7b97\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u662f etcd \u7684\u6838\u5fc3\u3002<\/p>\n

WAL<\/h4>\n

Write Ahead Log\uff08\u9884\u5199\u5f0f\u65e5\u5fd7\uff09\uff0c\u662f etcd \u7684\u6570\u636e\u5b58\u50a8\u65b9\u5f0f\u3002\u9664\u4e86\u5728\u5185\u5b58\u4e2d\u5b58\u6709\u6240\u6709\u6570\u636e\u7684\u72b6\u6001\u4ee5\u53ca\u8282\u70b9\u7684\u7d22\u5f15\u4ee5\u5916\uff0cetcd \u5c31\u901a\u8fc7 WAL \u8fdb\u884c\u6301\u4e45\u5316\u5b58\u50a8\u3002WAL \u4e2d\uff0c \u6240\u6709\u7684\u6570\u636e\u63d0\u4ea4\u524d\u90fd\u4f1a\u4e8b\u5148\u8bb0\u5f55\u65e5\u5fd7\u3002Snapshot \u662f\u4e3a\u4e86\u9632\u6b62\u6570\u636e\u8fc7\u591a\u800c\u8fdb\u884c\u7684\u72b6\u6001\u5feb\u7167\uff1bEntry \u8868\u793a\u5b58\u50a8\u7684\u5177\u4f53\u65e5\u5fd7\u5185\u5bb9\u3002<\/p>\n

\u901a\u5e38\uff0c\u4e00\u4e2a\u7528\u6237\u7684\u8bf7\u6c42\u53d1\u9001\u8fc7\u6765\uff0c\u4f1a\u7ecf\u7531 HTTP Server \u8f6c\u53d1\u7ed9 Store \u8fdb\u884c\u5177\u4f53\u7684\u4e8b\u52a1\u5904\u7406\uff0c\u5982\u679c\u6d89\u53ca\u5230\u8282\u70b9\u7684\u4fee\u6539\uff0c\u5219\u4ea4\u7ed9 Raft \u6a21\u5757\u8fdb\u884c\u72b6\u6001\u7684\u53d8\u66f4\u3001\u65e5\u5fd7\u7684\u8bb0\u5f55\uff0c\u7136\u540e\u518d\u540c\u6b65\u7ed9\u522b\u7684 etcd\u8282\u70b9\u4ee5\u786e\u8ba4\u6570\u636e\u63d0\u4ea4\uff0c\u6700\u540e\u8fdb\u884c\u6570\u636e\u7684\u63d0\u4ea4\uff0c\u518d\u6b21\u540c\u6b65\u3002<\/p>\n

\u4e09\u3001etcd\u5de5\u4f5c\u539f\u7406\uff08Raft\u534f\u8bae\uff09<\/h2>\n

etcd\u4f7f\u7528Raft\u534f\u8bae\u6765\u7ef4\u62a4\u96c6\u7fa4\u5185\u5404\u4e2a\u8282\u70b9\u72b6\u6001\u7684\u4e00\u81f4\u6027\u3002\u7b80\u5355\u8bf4\uff0cetcd\u96c6\u7fa4\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\uff0c\u7531\u591a\u4e2a\u8282\u70b9\u76f8\u4e92\u901a\u4fe1\u6784\u6210\u6574\u4f53\u5bf9\u5916\u670d\u52a1\uff0c\u6bcf\u4e2a\u8282\u70b9\u90fd\u5b58\u50a8\u4e86\u5b8c\u6574\u7684\u6570\u636e\uff0c\u5e76\u4e14\u901a\u8fc7Raft\u534f\u8bae\u4fdd\u8bc1\u6bcf\u4e2a\u8282\u70b9\u7ef4\u62a4\u7684\u6570\u636e\u662f\u4e00\u81f4\u7684\u3002<\/p>\n

<\/p>\n

\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u6bcf\u4e2aetcd\u8282\u70b9\u90fd\u7ef4\u62a4\u4e86\u4e00\u4e2a\u72b6\u6001\u673a\uff0c\u5e76\u4e14\uff0c\u4efb\u610f\u65f6\u523b\u81f3\u591a\u5b58\u5728\u4e00\u4e2a\u6709\u6548\u7684\u4e3b\u8282\u70b9\u3002\u4e3b\u8282\u70b9\u5904\u7406\u6240\u6709\u6765\u81ea\u5ba2\u6237\u7aef\u5199\u64cd\u4f5c\uff0c\u901a\u8fc7Raft\u534f\u8bae\u4fdd\u8bc1\u5199\u64cd\u4f5c\u5bf9\u72b6\u6001\u673a\u7684\u6539\u52a8\u4f1a\u53ef\u9760\u7684\u540c\u6b65\u5230\u5176\u4ed6\u8282\u70b9\u3002<\/p>\n

etcd\u5de5\u4f5c\u539f\u7406\u6838\u5fc3\u90e8\u5206\u5728\u4e8eRaft\u534f\u8bae\u3002\u672c\u8282\u63a5\u4e0b\u6765\u5c06\u7b80\u8981\u4ecb\u7ecdRaft\u534f\u8bae\uff0c
\nRaft\u534f\u8bae\u6b63\u5982\u8bba\u6587\u6240\u8ff0\uff0c\u786e\u5b9e\u65b9\u4fbf\u7406\u89e3\u3002\u4e3b\u8981\u5206\u4e3a\u4e09\u4e2a\u90e8\u5206\uff1a\u9009\u4e3b\uff0c\u65e5\u5fd7\u590d\u5236\uff0c\u5b89\u5168\u6027\u3002<\/p>\n

3.1 Raft\u534f\u8bae-\u9009\u4e3b<\/h4>\n

Raft\u534f\u8bae\u662f\u7528\u4e8e\u7ef4\u62a4\u4e00\u7ec4\u670d\u52a1\u8282\u70b9\u6570\u636e\u4e00\u81f4\u6027\u7684\u534f\u8bae\u3002\u8fd9\u4e00\u7ec4\u670d\u52a1\u8282\u70b9\u6784\u6210\u4e00\u4e2a\u96c6\u7fa4\uff0c\u5e76\u4e14\u6709\u4e00\u4e2a\u4e3b\u8282\u70b9\u6765\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\u3002\u5f53\u96c6\u7fa4\u521d\u59cb\u5316\uff0c\u6216\u8005\u4e3b\u8282\u70b9\u6302\u6389\u540e\uff0c\u9762\u4e34\u4e00\u4e2a\u9009\u4e3b\u95ee\u9898\u3002\u96c6\u7fa4\u4e2d\u6bcf\u4e2a\u8282\u70b9\uff0c\u4efb\u610f\u65f6\u523b\u5904\u4e8eLeader, Follower, Candidate\u8fd9\u4e09\u4e2a\u89d2\u8272\u4e4b\u4e00\u3002\u9009\u4e3e\u7279\u70b9\u5982\u4e0b\uff1a<\/p>\n

\u5f53\u96c6\u7fa4\u521d\u59cb\u5316\u65f6\u5019\uff0c\u6bcf\u4e2a\u8282\u70b9\u90fd\u662fFollower\u89d2\u8272\uff1b
\n\u96c6\u7fa4\u4e2d\u5b58\u5728\u81f3\u591a1\u4e2a\u6709\u6548\u7684\u4e3b\u8282\u70b9\uff0c\u901a\u8fc7\u5fc3\u8df3\u4e0e\u5176\u4ed6\u8282\u70b9\u540c\u6b65\u6570\u636e\uff1b
\n\u5f53Follower\u5728\u4e00\u5b9a\u65f6\u95f4\u5185\u6ca1\u6709\u6536\u5230\u6765\u81ea\u4e3b\u8282\u70b9\u7684\u5fc3\u8df3\uff0c\u4f1a\u5c06\u81ea\u5df1\u89d2\u8272\u6539\u53d8\u4e3aCandidate\uff0c\u5e76\u53d1\u8d77\u4e00\u6b21\u9009\u4e3b\u6295\u7968\uff1b\u5f53\u6536\u5230\u5305\u62ec\u81ea\u5df1\u5728\u5185\u8d85\u8fc7\u534a\u6570\u8282\u70b9\u8d5e\u6210\u540e\uff0c\u9009\u4e3e\u6210\u529f\uff1b\u5f53\u6536\u5230\u7968\u6570\u4e0d\u8db3\u534a\u6570\u9009\u4e3e\u5931\u8d25\uff0c\u6216\u8005\u9009\u4e3e\u8d85\u65f6\u3002\u82e5\u672c\u8f6e\u672a\u9009\u51fa\u4e3b\u8282\u70b9\uff0c\u5c06\u8fdb\u884c\u4e0b\u4e00\u8f6e\u9009\u4e3e\uff08\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\uff0c\u662f\u7531\u4e8e\u591a\u4e2a\u8282\u70b9\u540c\u65f6\u9009\u4e3e\uff0c\u6240\u6709\u8282\u70b9\u5747\u4e3a\u83b7\u5f97\u8fc7\u534a\u9009\u7968\uff09\u3002
\nCandidate\u8282\u70b9\u6536\u5230\u6765\u81ea\u4e3b\u8282\u70b9\u7684\u4fe1\u606f\u540e\uff0c\u4f1a\u7acb\u5373\u7ec8\u6b62\u9009\u4e3e\u8fc7\u7a0b\uff0c\u8fdb\u5165Follower\u89d2\u8272\u3002<\/p>\n

\u4e3a\u4e86\u907f\u514d\u9677\u5165\u9009\u4e3b\u5931\u8d25\u5faa\u73af\uff0c\u6bcf\u4e2a\u8282\u70b9\u672a\u6536\u5230\u5fc3\u8df3\u53d1\u8d77\u9009\u4e3e\u7684\u65f6\u95f4\u662f\u4e00\u5b9a\u8303\u56f4\u5185\u7684\u968f\u673a\u503c\uff0c\u8fd9\u6837\u80fd\u591f\u907f\u514d2\u4e2a\u8282\u70b9\u540c\u65f6\u53d1\u8d77\u9009\u4e3b\u3002<\/p>\n

3.2 Raft\u534f\u8bae-\u65e5\u5fd7\u590d\u5236<\/h4>\n

\u6240\u8c13\u65e5\u5fd7\u590d\u5236\uff0c\u662f\u6307\u4e3b\u8282\u70b9\u5c06\u6bcf\u6b21\u64cd\u4f5c\u5f62\u6210\u65e5\u5fd7\u6761\u76ee\uff0c\u5e76\u6301\u4e45\u5316\u5230\u672c\u5730\u78c1\u76d8\uff0c\u7136\u540e\u901a\u8fc7\u7f51\u7edcIO\u53d1\u9001\u7ed9\u5176\u4ed6\u8282\u70b9\u3002\u5176\u4ed6\u8282\u70b9\u6839\u636e\u65e5\u5fd7\u7684\u903b\u8f91\u65f6\u949f(TERM)\u548c\u65e5\u5fd7\u7f16\u53f7(INDEX)\u6765\u5224\u65ad\u662f\u5426\u5c06\u8be5\u65e5\u5fd7\u8bb0\u5f55\u6301\u4e45\u5316\u5230\u672c\u5730\u3002\u5f53\u4e3b\u8282\u70b9\u6536\u5230\u5305\u62ec\u81ea\u5df1\u5728\u5185\u8d85\u8fc7\u534a\u6570\u8282\u70b9\u6210\u529f\u8fd4\u56de\uff0c\u90a3\u4e48\u8ba4\u4e3a\u8be5\u65e5\u5fd7\u662f\u53ef\u63d0\u4ea4\u7684(committed\uff09\uff0c\u5e76\u5c06\u65e5\u5fd7\u8f93\u5165\u5230\u72b6\u6001\u673a\uff0c\u5c06\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n

\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6bcf\u6b21\u9009\u4e3b\u90fd\u4f1a\u5f62\u6210\u4e00\u4e2a\u552f\u4e00\u7684TERM\u7f16\u53f7\uff0c\u76f8\u5f53\u4e8e\u903b\u8f91\u65f6\u949f\u3002\u6bcf\u4e00\u6761\u65e5\u5fd7\u90fd\u6709\u5168\u5c40\u552f\u4e00\u7684\u7f16\u53f7\u3002<\/p>\n

<\/p>\n

\u4e3b\u8282\u70b9\u901a\u8fc7\u7f51\u7edcIO\u5411\u5176\u4ed6\u8282\u70b9\u8ffd\u52a0\u65e5\u5fd7\u3002\u82e5\u67d0\u8282\u70b9\u6536\u5230\u65e5\u5fd7\u8ffd\u52a0\u7684\u6d88\u606f\uff0c\u9996\u5148\u5224\u65ad\u8be5\u65e5\u5fd7\u7684TERM\u662f\u5426\u8fc7\u671f\uff0c\u4ee5\u53ca\u8be5\u65e5\u5fd7\u6761\u76ee\u7684INDEX\u662f\u5426\u6bd4\u5f53\u524d\u4ee5\u53ca\u63d0\u4ea4\u7684\u65e5\u5fd7\u7684INDEX\u8ddf\u65e9\u3002\u82e5\u5df2\u8fc7\u671f\uff0c\u6216\u8005\u6bd4\u63d0\u4ea4\u7684\u65e5\u5fd7\u66f4\u65e9\uff0c\u90a3\u4e48\u5c31\u62d2\u7edd\u8ffd\u52a0\uff0c\u5e76\u8fd4\u56de\u8be5\u8282\u70b9\u5f53\u524d\u7684\u5df2\u63d0\u4ea4\u7684\u65e5\u5fd7\u7684\u7f16\u53f7\u3002\u5426\u5219\uff0c\u5c06\u65e5\u5fd7\u8ffd\u52a0\uff0c\u5e76\u8fd4\u56de\u6210\u529f\u3002<\/p>\n

\u5f53\u4e3b\u8282\u70b9\u6536\u5230\u5176\u4ed6\u8282\u70b9\u5173\u4e8e\u65e5\u5fd7\u8ffd\u52a0\u7684\u56de\u590d\u540e\uff0c\u82e5\u53d1\u73b0\u6709\u62d2\u7edd\uff0c\u5219\u6839\u636e\u8be5\u8282\u70b9\u8fd4\u56de\u7684\u5df2\u63d0\u4ea4\u65e5\u5fd7\u7f16\u53f7\uff0c\u53d1\u751f\u5176\u7f16\u53f7\u4e0b\u4e00\u6761\u65e5\u5fd7\u3002<\/p>\n

\u4e3b\u8282\u70b9\u50cf\u5176\u4ed6\u8282\u70b9\u540c\u6b65\u65e5\u5fd7\uff0c\u8fd8\u4f5c\u4e86\u62e5\u585e\u63a7\u5236\u3002\u5177\u4f53\u5730\u8bf4\uff0c\u4e3b\u8282\u70b9\u53d1\u73b0\u65e5\u5fd7\u590d\u5236\u7684\u76ee\u6807\u8282\u70b9\u62d2\u7edd\u4e86\u67d0\u6b21\u65e5\u5fd7\u8ffd\u52a0\u6d88\u606f\uff0c\u5c06\u8fdb\u5165\u65e5\u5fd7\u63a2\u6d4b\u9636\u6bb5\uff0c\u4e00\u6761\u4e00\u6761\u53d1\u9001\u65e5\u5fd7\uff0c\u76f4\u5230\u76ee\u6807\u8282\u70b9\u63a5\u53d7\u65e5\u5fd7\uff0c\u7136\u540e\u8fdb\u5165\u5feb\u901f\u590d\u5236\u9636\u6bb5\uff0c\u53ef\u8fdb\u884c\u6279\u91cf\u65e5\u5fd7\u8ffd\u52a0\u3002<\/p>\n

\u6309\u7167\u65e5\u5fd7\u590d\u5236\u7684\u903b\u8f91\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u96c6\u7fa4\u4e2d\u6162\u8282\u70b9\u4e0d\u5f71\u54cd\u6574\u4e2a\u96c6\u7fa4\u7684\u6027\u80fd\u3002\u53e6\u5916\u4e00\u4e2a\u7279\u70b9\u662f\uff0c\u6570\u636e\u53ea\u4ece\u4e3b\u8282\u70b9\u590d\u5236\u5230Follower\u8282\u70b9\uff0c\u8fd9\u6837\u5927\u5927\u7b80\u5316\u4e86\u903b\u8f91\u6d41\u7a0b\u3002<\/p>\n

3.3 Raft\u534f\u8bae-\u5b89\u5168\u6027<\/h4>\n

\u622a\u6b62\u6b64\u523b\uff0c\u9009\u4e3b\u4ee5\u53ca\u65e5\u5fd7\u590d\u5236\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u8282\u70b9\u95f4\u6570\u636e\u4e00\u81f4\u3002\u8bd5\u60f3\uff0c\u5f53\u4e00\u4e2a\u67d0\u4e2a\u8282\u70b9\u6302\u6389\u4e86\uff0c\u4e00\u6bb5\u65f6\u95f4\u540e\u518d\u6b21\u91cd\u542f\uff0c\u5e76\u5f53\u9009\u4e3a\u4e3b\u8282\u70b9\u3002\u800c\u5728\u5176\u6302\u6389\u8fd9\u6bb5\u65f6\u95f4\u5185\uff0c\u96c6\u7fa4\u82e5\u6709\u8d85\u8fc7\u534a\u6570\u8282\u70b9\u5b58\u6d3b\uff0c\u96c6\u7fa4\u4f1a\u6b63\u5e38\u5de5\u4f5c\uff0c\u90a3\u4e48\u4f1a\u6709\u65e5\u5fd7\u63d0\u4ea4\u3002\u8fd9\u4e9b\u63d0\u4ea4\u7684\u65e5\u5fd7\u65e0\u6cd5\u4f20\u9012\u7ed9\u6302\u6389\u7684\u8282\u70b9\u3002\u5f53\u6302\u6389\u7684\u8282\u70b9\u518d\u6b21\u5f53\u9009\u4e3b\u8282\u70b9\uff0c\u5b83\u5c06\u7f3a\u5931\u90e8\u5206\u5df2\u63d0\u4ea4\u7684\u65e5\u5fd7\u3002\u5728\u8fd9\u6837\u573a\u666f\u4e0b\uff0c\u6309Raft\u534f\u8bae\uff0c\u5b83\u5c06\u81ea\u5df1\u65e5\u5fd7\u590d\u5236\u7ed9\u5176\u4ed6\u8282\u70b9\uff0c\u4f1a\u5c06\u96c6\u7fa4\u5df2\u7ecf\u63d0\u4ea4\u7684\u65e5\u5fd7\u7ed9\u8986\u76d6\u6389\u3002<\/p>\n

\u8fd9\u663e\u7136\u662f\u4e0d\u53ef\u63a5\u53d7\u7684\u3002<\/p>\n

\u5176\u4ed6\u534f\u8bae\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u529e\u6cd5\u662f\uff0c\u65b0\u5f53\u9009\u7684\u4e3b\u8282\u70b9\u4f1a\u8be2\u95ee\u5176\u4ed6\u8282\u70b9\uff0c\u548c\u81ea\u5df1\u6570\u636e\u5bf9\u6bd4\uff0c\u786e\u5b9a\u51fa\u96c6\u7fa4\u5df2\u63d0\u4ea4\u6570\u636e\uff0c\u7136\u540e\u5c06\u7f3a\u5931\u7684\u6570\u636e\u540c\u6b65\u8fc7\u6765\u3002\u8fd9\u4e2a\u65b9\u6848\u6709\u660e\u663e\u7f3a\u9677\uff0c\u589e\u52a0\u4e86\u96c6\u7fa4\u6062\u590d\u670d\u52a1\u7684\u65f6\u95f4\uff08\u96c6\u7fa4\u5728\u9009\u4e3e\u9636\u6bb5\u4e0d\u53ef\u670d\u52a1\uff09\uff0c\u5e76\u4e14\u589e\u52a0\u4e86\u534f\u8bae\u7684\u590d\u6742\u5ea6\u3002<\/p>\n

Raft\u89e3\u51b3\u7684\u529e\u6cd5\u662f\uff0c\u5728\u9009\u4e3b\u903b\u8f91\u4e2d\uff0c\u5bf9\u80fd\u591f\u6210\u4e3a\u4e3b\u7684\u8282\u70b9\u52a0\u4ee5\u9650\u5236\uff0c\u786e\u4fdd\u9009\u51fa\u7684\u8282\u70b9\u5df2\u5b9a\u5305\u542b\u4e86\u96c6\u7fa4\u5df2\u7ecf\u63d0\u4ea4\u7684\u6240\u6709\u65e5\u5fd7\u3002\u5982\u679c\u65b0\u9009\u51fa\u7684\u4e3b\u8282\u70b9\u5df2\u7ecf\u5305\u542b\u4e86\u96c6\u7fa4\u6240\u6709\u63d0\u4ea4\u7684\u65e5\u5fd7\uff0c\u90a3\u5c31\u4e0d\u9700\u8981\u4ece\u548c\u5176\u4ed6\u8282\u70b9\u6bd4\u5bf9\u6570\u636e\u4e86\u3002\u7b80\u5316\u4e86\u6d41\u7a0b\uff0c\u7f29\u77ed\u4e86\u96c6\u7fa4\u6062\u590d\u670d\u52a1\u7684\u65f6\u95f4\u3002<\/p>\n

\u8fd9\u91cc\u5b58\u5728\u4e00\u4e2a\u95ee\u9898\uff0c\u52a0\u4ee5\u8fd9\u6837\u9650\u5236\u4e4b\u540e\uff0c\u8fd8\u80fd\u5426\u9009\u51fa\u4e3b\u5462\uff1f\u7b54\u6848\u662f\uff1a\u53ea\u8981\u4ecd\u7136\u6709\u8d85\u8fc7\u534a\u6570\u8282\u70b9\u5b58\u6d3b\uff0c\u8fd9\u6837\u7684\u4e3b\u4e00\u5b9a\u80fd\u591f\u9009\u51fa\u3002\u56e0\u4e3a\u5df2\u7ecf\u63d0\u4ea4\u7684\u65e5\u5fd7\u5fc5\u7136\u88ab\u96c6\u7fa4\u4e2d\u8d85\u8fc7\u534a\u6570\u8282\u70b9\u6301\u4e45\u5316\uff0c\u663e\u7136\u524d\u4e00\u4e2a\u4e3b\u8282\u70b9\u63d0\u4ea4\u7684\u6700\u540e\u4e00\u6761\u65e5\u5fd7\u4e5f\u88ab\u96c6\u7fa4\u4e2d\u5927\u90e8\u5206\u8282\u70b9\u6301\u4e45\u5316\u3002\u5f53\u4e3b\u8282\u70b9\u6302\u6389\u540e\uff0c\u96c6\u7fa4\u4e2d\u4ecd\u6709\u5927\u90e8\u5206\u8282\u70b9\u5b58\u6d3b\uff0c\u90a3\u8fd9\u5b58\u6d3b\u7684\u8282\u70b9\u4e2d\u4e00\u5b9a\u5b58\u5728\u4e00\u4e2a\u8282\u70b9\u5305\u542b\u4e86\u5df2\u7ecf\u63d0\u4ea4\u7684\u65e5\u5fd7\u4e86\u3002<\/p>\n

\u81f3\u6b64\uff0c\u5173\u4e8eRaft\u534f\u8bae\u7684\u7b80\u4ecb\u5c31\u5168\u90e8\u7ed3\u675f\u4e86\u3002<\/p>\n

\u56db\u3001etcd \u6570\u636e\u5b58\u50a8<\/h2>\n

etcd \u7684\u5b58\u50a8\u5206\u4e3a \u5185\u5b58\u5b58\u50a8 \u548c \u6301\u4e45\u5316\uff08\u786c\u76d8\uff09\u5b58\u50a8 \u4e24\u90e8\u5206\u3002<\/p>\n

\n

\u5185\u5b58\u4e2d\u7684\u5b58\u50a8\u9664\u4e86\u987a\u5e8f\u5316\u7684\u8bb0\u5f55\u4e0b\u6240\u6709\u7528\u6237\u5bf9\u8282\u70b9\u6570\u636e\u53d8\u66f4\u7684\u8bb0\u5f55\u5916\uff0c\u8fd8\u4f1a\u5bf9\u7528\u6237\u6570\u636e\u8fdb\u884c\u7d22\u5f15\u3001\u5efa\u5806\u7b49\u65b9\u4fbf\u67e5\u8be2\u7684\u64cd\u4f5c\u3002
\n \u800c\u6301\u4e45\u5316\u5219\u4f7f\u7528\u9884\u5199\u5f0f\u65e5\u5fd7\uff08WAL\uff1aWrite Ahead Log\uff09\u8fdb\u884c\u8bb0\u5f55\u5b58\u50a8\u3002<\/p>\n<\/blockquote>\n

\u5728 WAL \u7684\u4f53\u7cfb\u4e2d\uff0c\u6240\u6709\u7684\u6570\u636e\u5728\u63d0\u4ea4\u4e4b\u524d\u90fd\u4f1a\u8fdb\u884c\u65e5\u5fd7\u8bb0\u5f55\u3002\u5728 etcd \u7684\u6301\u4e45\u5316\u5b58\u50a8\u76ee\u5f55\u4e2d\uff0c\u6709\u4e24\u4e2a\u5b50\u76ee\u5f55\u3002\u4e00\u4e2a\u662f WAL\uff0c\u5b58\u50a8\u7740\u6240\u6709\u4e8b\u52a1\u7684\u53d8\u5316\u8bb0 \u5f55\uff1b\u53e6\u4e00\u4e2a\u5219\u662f snapshot\uff0c\u7528\u4e8e\u5b58\u50a8\u67d0\u4e00\u4e2a\u65f6\u523b etcd \u6240\u6709\u76ee\u5f55\u7684\u6570\u636e\u3002\u901a\u8fc7 WAL \u548c snapshot \u76f8\u7ed3\u5408\u7684\u65b9\u5f0f\uff0cetcd \u53ef\u4ee5\u6709\u6548\u7684\u8fdb\u884c\u6570\u636e\u5b58\u50a8\u548c\u8282\u70b9\u6545\u969c\u6062\u590d\u7b49\u64cd\u4f5c\u3002<\/p>\n

\u65e2\u7136\u6709\u4e86 WAL \u5b9e\u65f6\u5b58\u50a8\u4e86\u6240\u6709\u7684\u53d8\u66f4\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981 snapshot \u5462\uff1f\u968f\u7740\u4f7f\u7528\u91cf\u7684\u589e\u52a0\uff0cWAL \u5b58\u50a8\u7684\u6570\u636e\u4f1a\u66b4\u589e\uff0c\u4e3a\u4e86\u9632\u6b62\u78c1\u76d8\u5f88\u5feb\u5c31\u7206\u6ee1\uff0cetcd \u9ed8\u8ba4\u6bcf 10000 \u6761\u8bb0\u5f55\u505a\u4e00\u6b21 snapshot\uff0c\u7ecf\u8fc7 snapshot \u4ee5\u540e\u7684 WAL \u6587\u4ef6\u5c31\u53ef\u4ee5\u5220\u9664\u3002\u800c\u901a\u8fc7 API \u53ef\u4ee5\u67e5\u8be2\u7684\u5386\u53f2 etcd \u64cd\u4f5c\u9ed8\u8ba4\u4e3a 1000 \u6761\u3002<\/p>\n

\u9996\u6b21\u542f\u52a8\u65f6\uff0cetcd \u4f1a\u628a\u542f\u52a8\u7684\u914d\u7f6e\u4fe1\u606f\u5b58\u50a8\u5230data-dir\u53c2\u6570\u6307\u5b9a\u7684\u6570\u636e\u76ee\u5f55\u4e2d\u3002\u914d\u7f6e\u4fe1\u606f\u5305\u62ec\u672c\u5730\u8282\u70b9\u7684 ID\u3001\u96c6\u7fa4 ID \u548c\u521d\u59cb\u65f6\u96c6\u7fa4\u4fe1\u606f\u3002\u7528\u6237\u9700\u8981\u907f\u514d etcd \u4ece\u4e00\u4e2a\u8fc7\u671f\u7684\u6570\u636e\u76ee\u5f55\u4e2d\u91cd\u65b0\u542f\u52a8\uff0c\u56e0\u4e3a\u4f7f\u7528\u8fc7\u671f\u7684\u6570\u636e\u76ee\u5f55\u542f\u52a8\u7684\u8282\u70b9\u4f1a\u4e0e\u96c6\u7fa4\u4e2d\u7684\u5176\u4ed6\u8282\u70b9\u4ea7\u751f\u4e0d\u4e00\u81f4\uff08\u5982\uff1a \u4e4b\u524d\u5df2\u7ecf\u8bb0\u5f55\u5e76\u540c\u610f Leader \u8282\u70b9\u5b58\u50a8\u67d0\u4e2a\u4fe1\u606f\uff0c\u91cd\u542f\u540e\u53c8\u5411 Leader \u8282\u70b9\u7533\u8bf7\u8fd9\u4e2a\u4fe1\u606f\uff09\u3002\u6240\u4ee5\uff0c\u4e3a\u4e86\u6700\u5927\u5316\u96c6\u7fa4\u7684\u5b89\u5168\u6027\uff0c\u4e00\u65e6\u6709\u4efb\u4f55\u6570\u636e\u635f\u574f\u6216\u4e22\u5931 \u7684\u53ef\u80fd\u6027\uff0c\u4f60\u5c31\u5e94\u8be5\u628a\u8fd9\u4e2a\u8282\u70b9\u4ece\u96c6\u7fa4\u4e2d\u79fb\u9664\uff0c\u7136\u540e\u52a0\u5165\u4e00\u4e2a\u4e0d\u5e26\u6570\u636e\u76ee\u5f55\u7684\u65b0\u8282\u70b9\u3002<\/p>\n

\n
#@ etcd\u5728\u78c1\u76d8\u4e2d\u5b58\u50a8snapshot\u548cWAL\n[root@c7-Host ~]# tree \/var\/lib\/etcd\/infra11.etcd\/\n\/var\/lib\/etcd\/infra11.etcd\/\n\u2514\u2500\u2500 member\n    \u251c\u2500\u2500 snap\n    \u2502  \u251c\u2500\u2500 00000000000002db-000000000021447a.snap\n    \u2502  \u251c\u2500\u2500 00000000000002db-0000000000216b8b.snap\n    \u2502  \u251c\u2500\u2500 00000000000002db-000000000021929c.snap\n    \u2502  \u251c\u2500\u2500 00000000000002db-000000000021b9ad.snap\n    \u2502  \u251c\u2500\u2500 00000000000002db-000000000021e0be.snap\n    \u2502  \u2514\u2500\u2500 db\n    \u2514\u2500\u2500 wal\n        \u251c\u2500\u2500 0000000000000000-0000000000000000.wal\n        \u251c\u2500\u2500 0000000000000001-000000000007ab55.wal\n        \u251c\u2500\u2500 0000000000000002-00000000000f53fd.wal\n        \u251c\u2500\u2500 0000000000000003-000000000016fc8c.wal\n        \u251c\u2500\u2500 0000000000000004-00000000001ea52c.wal\n        \u2514\u2500\u2500 0.tmp\n3 directories, 12 files<\/code><\/pre>\n<\/div>\n
\u4e94\u3001\u90e8\u7f72etcd<\/h2>\n
etcd \u4e00\u822c\u90e8\u7f72\u96c6\u7fa4\u63a8\u8350\u5947\u6570\u4e2a\u8282\u70b9\uff0c\u63a8\u8350\u7684\u6570\u91cf\u4e3a 3\u30015 \u6216\u8005 7 \u4e2a\u8282\u70b9\u6784\u6210\u4e00\u4e2a\u96c6\u7fa4\u3002<\/p>\n
etcd\u5b89\u88c5\u5f88\u7b80\u5355\uff0c\u76f4\u63a5\u4ecegithub\u4e0b\u8f7d\uff0c\u65e0\u9700\u7f16\u8bd1\uff0c\u6216\u8005yum\u5b89\u88c5\u90fd\u53ef\u4ee5<\/p>\n
\n
#@yum install from epel\n# yum install etcd -y\n# etcd --version\netcd Version: 3.2.9\nGit SHA: f1d7dd8\nGo Version: go1.8.3\nGo OS\/Arch: linux\/amd64<\/code><\/pre>\n<\/div>\n
Etcd 3.X\u7684\u7248\u672c\u6ca1\u6709\u914d\u7f6e\u6587\u4ef6\uff0c\u4e5f\u4e0d\u80fd\u6307\u5b9a\u914d\u7f6e\u6587\u4ef6\uff0c\u6240\u6709\u9009\u9879\u90fd\u53ef\u4ee5\u4f7f\u7528\u547d\u4ee4\u884c\u53c2\u6570\u6216\u8005\u73af\u5883\u53d8\u91cf\u6765\u4f20\u9012\u3002<\/p>\n
\u6240\u4ee5\u5728CentOS7\u4e2d\u76f4\u63a5\u7f16\u8f91\u542f\u52a8\u811a\u672c\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
\n
# cat \/usr\/lib\/systemd\/system\/etcd.service\n[Unit]\nDescription=Etcd Server\nAfter=network.target\nAfter=network-online.target\nWants=network-online.target\n[Service]\nType=notify\nWorkingDirectory=\/var\/lib\/etcd\/\nUser=etcd\n# set GOMAXPROCS to number of processors\nExecStart=\/bin\/bash -c \"GOMAXPROCS=$(nproc) \/usr\/bin\/etcd \\\n  --name infra1 \\\n  --listen-peer-urls http:\/\/10.140.100.12:2380 \\\n  --listen-client-urls http:\/\/10.140.100.12:2379,http:\/\/127.0.0.1:2379 \\\n  --initial-advertise-peer-urls http:\/\/10.140.100.12:2380 \\\n  --advertise-client-urls http:\/\/10.140.100.12:2379 \\\n  --initial-cluster-token etcd-cluster \\\n  --initial-cluster-state new \\\n  --initial-cluster infra1=http:\/\/10.140.100.12:2380,infra2=http:\/\/10.140.100.13:2380,infra3=http:\/\/10.140.100.15:2380 \\\n  --data-dir=\/var\/lib\/etcd\/ \"\nRestart=on-failure\nLimitNOFILE=65536\n[Install]\nWantedBy=multi-user.target<\/code><\/pre>\n<\/div>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528etcdctl\u547d\u4ee4\u68c0\u6d4betcd\u96c6\u7fa4\u5065\u5eb7\u72b6\u51b5<\/p>\n
\n
[root@idc-sm-rd-k8s-1 ~]# etcdctl cluster-health\nmember 27683ef1237cf56 is healthy: got healthy result from http:\/\/10.140.100.15:2379\nmember 2ce5820bdb490d73 is healthy: got healthy result from http:\/\/10.140.100.13:2379\nmember 534827736701c1b8 is healthy: got healthy result from http:\/\/10.140.100.12:2379\ncluster is healthy\n[root@idc-sm-rd-k8s-1 ~]#\n[root@idc-sm-rd-k8s-1 ~]# etcdctl member list\n27683ef1237cf56: name=infra3 peerURLs=http:\/\/10.140.100.15:2380 clientURLs=http:\/\/10.140.100.15:2379 isLeader=false\n2ce5820bdb490d73: name=infra2 peerURLs=http:\/\/10.140.100.13:2380 clientURLs=http:\/\/10.140.100.13:2379 isLeader=false\n534827736701c1b8: name=infra1 peerURLs=http:\/\/10.140.100.12:2380 clientURLs=http:\/\/10.140.100.12:2379 isLeader=true\n[root@idc-sm-rd-k8s-1 ~]#\n[root@idc-sm-rd-k8s-1 ~]#etcdctl set \/foo\/bar \"hello world\"\nhello world\n[root@idc-sm-rd-k8s-1 ~]# etcdctl get \/foo\/bar\nhello world\n[root@idc-sm-rd-k8s-1 ~]# etcdctl ls \/foo\n\/foo\/bar\n[root@idc-sm-rd-k8s-1 ~]#\n<\/code><\/pre>\n<\/div>\n
\u53c2\u8003\u8d44\u6599<\/h2>\n
http:\/\/jolestar.com\/etcd-architecture\/<\/a> 
\nhttps:\/\/yeasy.gitbooks.io\/docker_practice\/content\/etcd\/intro.html<\/a> 
\nhttp:\/\/www.cnblogs.com\/softidea\/p\/6517959.html<\/a> 
\nhttp:\/\/blog.mallux.me\/2017\/02\/08\/etcd\/<\/a> 
\nhttp:\/\/blog.csdn.net\/huwh_\/article\/details\/74502762<\/a><\/p>\n
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<\/wiz_tmp_tag><\/p>\n
\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1aIPCPU-\u7f51\u7edc\u4e4b\u8def<\/a> » Etcd\u7b80\u4ecb\u3001\u67b6\u6784\u548c\u5de5\u4f5c\u539f\u7406<\/a><\/p>","protected":false},"excerpt":{"rendered":"
etcd\u7b80\u4ecb\u3001\u67b6\u6784.md \u4e00\u3001etcd\u7b80\u4ecb etcd \u662f CoreOS \u56e2\u961f\u4e8e 2013 \u5e74 6 \u6708\u53d1\u8d77\u7684\u5f00\u6e90\u9879\u76ee\uff0c\u5b83\u7684\u76ee\u6807\u662f\u6784\u5efa\u4e00\u4e2a\u9ad8\u53ef\u7528\u7684\u5206\u5e03\u5f0f\u952e\u503c\uff08key-value\uff09\u6570\u636e\u5e93\uff0c\u57fa\u4e8e Go \u8bed\u8a00\u5b9e\u73b0\u3002\u5b98\u65b9\u63cf\u8ff0\uff1a etcd is a distributed, consistent key-value store for shared configuration and service discovery. etcd\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u7684\uff0c\u4e00\u81f4\u7684 key-value \u5b58\u50a8\uff0c\u4e3b\u8981\u7528\u9014\u662f\u5171\u4eab\u914d\u7f6e\u548c\u670d\u52a1\u53d1\u73b0\u3002 \u4e8c\u3001Ectd\u67b6\u6784 etcd \u4e3b\u8981\u5206\u4e3a\u56db\u4e2a\u90e8\u5206\u3002 HTTP Server \u7528\u4e8e\u5904\u7406\u7528\u6237\u53d1\u9001\u7684 API \u8bf7\u6c42\u4ee5\u53ca\u5176\u5b83 etcd \u8282\u70b9\u7684\u540c\u6b65\u4e0e\u5fc3\u8df3\u4fe1\u606f\u8bf7\u6c42\u3002 Store \u7528\u4e8e\u5904\u7406 etcd \u652f\u6301\u7684\u5404\u7c7b\u529f\u80fd\u7684\u4e8b\u52a1\uff0c\u5305\u62ec\u6570\u636e\u7d22\u5f15\u3001\u8282\u70b9\u72b6\u6001\u53d8\u66f4\u3001\u76d1\u63a7\u4e0e\u53cd\u9988\u3001\u4e8b\u4ef6\u5904\u7406\u4e0e\u6267\u884c\u7b49\u7b49\uff0c\u662f etcd \u5bf9\u7528\u6237\u63d0\u4f9b\u7684\u5927\u591a\u6570 API \u529f\u80fd\u7684\u5177\u4f53\u5b9e\u73b0\u3002 Raft Raft \u5f3a\u4e00\u81f4\u6027\u7b97\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\uff0c\u662f etcd \u7684\u6838\u5fc3\u3002 WAL Write Ahead Log\uff08\u9884\u5199\u5f0f\u65e5\u5fd7\uff09\uff0c\u662f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,13],"tags":[141],"_links":{"self":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/941"}],"collection":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/comments?post=941"}],"version-history":[{"count":0,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/941\/revisions"}],"wp:attachment":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/media?parent=941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/categories?post=941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/tags?post=941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}