创建mongodb的replica set的时候，只是做成了1主2从，没有做成1主1从1仲裁。这我们将一个几点从replica set中删除，再以仲裁节点的身份加入到replica set中：
1.初始状态：
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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.删除节点：
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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节点：
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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，虽然要求config server为replica set，但是不支持arbiter。添加的时候，会报错：
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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()也可以进行操作，效果类似re.remove+rs.addArb，详见：mongodb官方文档- Remove Members from Replica Set