前言
在創建mongodb的replica set的時候，只是做成了1主2從，沒有做成1主1從1仲裁。這我們將一個幾點從replica set中刪除，再以仲裁節點的身份加入到replica set中：
1.初始狀態：
shard1ReplSet:PRIMARY> rs.status();rs.status();{ "set" : "shard1ReplSet", "date" : ISODate("2017-02-21T07:48:03.058Z"), "myState" : 1, "term" : NumberLong(1), "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "appliedOpTime" : { "ts" : Timestamp(1487663274, 1), "t" : NumberLong(1) }, "durableOpTime" : { "ts" : Timestamp(1487587982, 1), "t" : NumberLong(-1) } }, "members" : [ { "_id" : 0, "name" : "10.13.0.130:22001", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 76672, "optime" : { "ts" : Timestamp(1487663274, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2017-02-21T07:47:54Z"), "electionTime" : Timestamp(1487587993, 1), "electionDate" : ISODate("2017-02-20T10:53:13Z"), "configVersion" : 1, "self" : true }, { "_id" : 1, "name" : "10.13.0.131:22001", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 75300, "optime" : { "ts" : Timestamp(1487663274, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1487587982, 1), "t" : NumberLong(-1) }, "optimeDate" : ISODate("2017-02-21T07:47:54Z"), "optimeDurableDate" : ISODate("2017-02-20T10:53:02Z"), "lastHeartbeat" : ISODate("2017-02-21T07:48:02.150Z"), "lastHeartbeatRecv" : ISODate("2017-02-21T07:48:02.215Z"), "pingMs" : NumberLong(0), "syncingTo" : "10.13.0.132:22001", "configVersion" : 1 }, { "_id" : 2, "name" : "10.13.0.132:22001", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 75300, "optime" : { "ts" : Timestamp(1487663274, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1487587982, 1), "t" : NumberLong(-1) }, "optimeDate" : ISODate("2017-02-21T07:47:54Z"), "optimeDurableDate" : ISODate("2017-02-20T10:53:02Z"), "lastHeartbeat" : ISODate("2017-02-21T07:48:02.889Z"), "lastHeartbeatRecv" : ISODate("2017-02-21T07:48:01.503Z"), "pingMs" : NumberLong(0), "syncingTo" : "10.13.0.130:22001", "configVersion" : 1 } ], "ok" : 1}shard1ReplSet:PRIMARY> shard1ReplSet:PRIMARY> shard1ReplSet:PRIMARY> shard1ReplSet:PRIMARY> 2.刪除節點：
shard1ReplSet:PRIMARY> rs.remove("10.13.0.132:22001"); rs.remove("10.13.0.132:22001"); { "ok" : 1 }shard1ReplSet:PRIMARY> rs.status();rs.status();{ "set" : "shard1ReplSet", "date" : ISODate("2017-02-21T07:50:52.934Z"), "myState" : 1, "term" : NumberLong(1), "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "appliedOpTime" : { "ts" : Timestamp(1487663447, 1), "t" : NumberLong(1) }, "durableOpTime" : { "ts" : Timestamp(1487587982, 1), "t" : NumberLong(-1) } }, "members" : [ { "_id" : 0, "name" : "10.13.0.130:22001", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 76841, "optime" : { "ts" : Timestamp(1487663447, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2017-02-21T07:50:47Z"), "electionTime" : Timestamp(1487587993, 1), "electionDate" : ISODate("2017-02-20T10:53:13Z"), "configVersion" : 2, "self" : true }, { "_id" : 1, "name" : "10.13.0.131:22001", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 75470, "optime" : { "ts" : Timestamp(1487663447, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1487587982, 1), "t" : NumberLong(-1) }, "optimeDate" : ISODate("2017-02-21T07:50:47Z"), "optimeDurableDate" : ISODate("2017-02-20T10:53:02Z"), "lastHeartbeat" : ISODate("2017-02-21T07:50:51.182Z"), "lastHeartbeatRecv" : ISODate("2017-02-21T07:50:52.212Z"), "pingMs" : NumberLong(0), "configVersion" : 2 } ], "ok" : 1}shard1ReplSet:PRIMARY> shard1ReplSet:PRIMARY> shard1ReplSet:PRIMARY> 3.添加成arbiter節點：
shard1ReplSet:PRIMARY> rs.addArb("10.13.0.132:22001");rs.addArb("10.13.0.132:22001");{ "ok" : 1 }shard1ReplSet:PRIMARY> shard1ReplSet:PRIMARY> rs.status();rs.status();{ "set" : "shard1ReplSet", "date" : ISODate("2017-02-21T07:54:05.161Z"), "myState" : 1, "term" : NumberLong(1), "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "appliedOpTime" : { "ts" : Timestamp(1487663637, 1), "t" : NumberLong(1) }, "durableOpTime" : { "ts" : Timestamp(1487587982, 1), "t" : NumberLong(-1) } }, "members" : [ { "_id" : 0, "name" : "10.13.0.130:22001", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 77034, "optime" : { "ts" : Timestamp(1487663637, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2017-02-21T07:53:57Z"), "electionTime" : Timestamp(1487587993, 1), "electionDate" : ISODate("2017-02-20T10:53:13Z"), "configVersion" : 3, "self" : true }, { "_id" : 1, "name" : "10.13.0.131:22001", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 75662, "optime" : { "ts" : Timestamp(1487663637, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1487587982, 1), "t" : NumberLong(-1) }, "optimeDate" : ISODate("2017-02-21T07:53:57Z"), "optimeDurableDate" : ISODate("2017-02-20T10:53:02Z"), "lastHeartbeat" : ISODate("2017-02-21T07:54:03.210Z"), "lastHeartbeatRecv" : ISODate("2017-02-21T07:54:02.211Z"), "pingMs" : NumberLong(0), "configVersion" : 3 }, { "_id" : 2, "name" : "10.13.0.132:22001", "health" : 1, "state" : 7, "stateStr" : "ARBITER", "uptime" : 5, "lastHeartbeat" : ISODate("2017-02-21T07:54:03.214Z"), "lastHeartbeatRecv" : ISODate("2017-02-21T07:54:02.274Z"), "pingMs" : NumberLong(0), "configVersion" : 3 } ], "ok" : 1}shard1ReplSet:PRIMARY> 注1： mongodb 3.4之后，雖然要求config server為replica set，但是不支持arbiter。
添加的時候，會報錯：
cfgReplSet:PRIMARY> rs.addArb("10.13.0.132:21000");rs.addArb("10.13.0.132:21000");{ "ok" : 0, "errmsg" : "Arbiters are not allowed in replica set configurations being used for config servers", "code" : 103, "codeName" : "NewReplicaSetConfigurationIncompatible"}cfgReplSet:PRIMARY> 注2：rs.reconfig()也可以進行操作，效果類似re.remove+rs.addArb，詳見：mongodb官方文檔- Remove Members from Replica Set
總結
以上就是關于mongodb添加arbiter節點的全部內容了，希望本文的內容對大家的學習或者工作能帶來一定的幫助，如果有疑問大家可以留言交流。
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