虚拟机里的MongoDB集群全部停掉之后，使用--replSet rs2参数重新启动。mongo shell连进去之后查看状况，
rs1:OTHER> rs.status()
{
"operationTime" : Timestamp(1559293558, 1),
"ok" : 0,
"errmsg" : "Our replica set config is invalid or we are not a member of it",
"code" : 93,
"codeName" : "InvalidReplicaSetConfig",
"$clusterTime" : {
"clusterTime" : Timestamp(1559293558, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
重新初始化，还是不行，rs.status()还是老样子
rs.initiate({
_id : "rs2",
members: [
{ _id: 0, host: "localhost:51001" },
{ _id: 1, host: "localhost:51002" },
{ _id: 2, host: "localhost:51003" }
]
})
配置信息看起来还正常
rs1:OTHER> rs.conf()
{
"_id" : "rs1",
"version" : 1,
"protocolVersion" : NumberLong(1),
"writeConcernMajorityJournalDefault" : true,
"members" : [
{
"_id" : 0,
"host" : "localhost:51001",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 1,
"host" : "localhost:51002",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 2,
"host" : "localhost:51003",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"catchUpTimeoutMillis" : -1,
"catchUpTakeoverDelayMillis" : 30000,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
},
"replicaSetId" : ObjectId("5cf0d661fb9b2ca10d607eca")
}
}
看一下log，有这么一段
2019-06-01T11:03:17.078+0800 W REPL [replexec-0] Local replica set configuration document reports set name of rs1, but command line reports rs2; waiting for reconfig or remote heartbeat
2019-06-01T11:03:17.078+0800 I REPL [replexec-0] New replica set config in use: { _id: "rs1", version: 1, protocolVersion: 1, writeConcernMajorityJournalDefault: true, members: [ { _id: 0, host: "localhost:51001", arbiterOnly: false, buildIndexes: true, hidden: false, priority: 1.0, tags: {}, slaveDelay: 0, votes: 1 }, { _id: 1, host: "localhost:51002", arbiterOnly: false, buildIndexes: true, hidden: false, priority: 1.0, tags: {}, slaveDelay: 0, votes: 1 }, { _id: 2, host: "localhost:51003", arbiterOnly: false, buildIndexes: true, hidden: false, priority: 1.0, tags: {}, slaveDelay: 0, votes: 1 } ], settings: { chainingAllowed: true, heartbeatIntervalMillis: 2000, heartbeatTimeoutSecs: 10, electionTimeoutMillis: 10000, catchUpTimeoutMillis: -1, catchUpTakeoverDelayMillis: 30000, getLastErrorModes: {}, getLastErrorDefaults: { w: 1, wtimeout: 0 }, replicaSetId: ObjectId('5cf0d661fb9b2ca10d607eca') } }
2019-06-01T11:03:17.078+0800 I REPL [replexec-0] This node is not a member of the config
2019-06-01T11:03:17.078+0800 I REPL [replexec-0] transition to REMOVED from STARTUP
2019-06-01T11:03:17.078+0800 I REPL [replexec-0] Starting replication storage threads
仔细一看，shell里的提示符，也是rs1。奇怪
那就改下名字吧
https://stackoverflow.com/questions/33400607/how-do-i-rename-a-mongodb-replica-set
1. 停止所有实例，使用非复制模式启动
重新启动，去掉--replSet参数
2. 清除复制集信息缓存数据库local
使用mongo shell连接到服务器，对3个实例分别执行以下命令
use local db.dropDatabase()
3. 停止所有实例，使用复制模式启动
重新启动，使用--replSet参数指定新的复制集名字
4. 初始化复制集
a. 使用mongo shell连接到其中一个实例，这个实例将作为新的PRIMARY
b. 执行rs.initiate()。不要指定参数，不然会报错。其他配置参数可以在随后使用rs.reconfig()方法来设置
c. 对每一个secondary，使用rs.add("localhost:51002")添加到复制集
d. 等待secondary同步
这种方式不需要重新导入数据