我在k8s中配置了mongo副本集。 [MongoDB服务器版本：3.6.14] 这是副本集名称：
mongodb-replicaset-0.mongodb-replicaset.default.svc.cluster.local
mongodb-replicaset-1.mongodb-replicaset.default.svc.cluster.local
mongodb-replicaset-2.mongodb-replicaset.default.svc.cluster.local
当我使用以下URI连接到它
mongo --verbose "mongodb://mongodb-replicaset-0.mongodb-replicaset.default.svc.cluster.local/?replicaSet=rs0" -u <username> -p <password>
我能够连接，但在前几次尝试中均无法读取，并出现以下错误：
2019-12-26T18:46:02.773+0000 I NETWORK [thread1] Marking host mongodb-replicaset-0.mongodb-replicaset.default.svc.cluster.local:27017 as failed :: caused by :: NotMaster: got not master from: mongodb-replicaset-0.mongodb-replicaset.default.svc.cluster.local:27017 of repl set: rs0
2019-12-26T18:46:02.775+0000 E QUERY [thread1] Error: listCollections failed: {
"operationTime" : Timestamp(1577385959, 1),
"ok" : 0,
"errmsg" : "not master and slaveOk=false",
"code" : 13435,
"codeName" : "NotMasterNoSlaveOk",
"$clusterTime" : {
"clusterTime" : Timestamp(1577385959, 1),
"signature" : {
"hash" : BinData(0,"Q6zckJKVYI5nTAz3JJkl5QCC9kQ="),
"keyId" : NumberLong("6774321924500619265")
}
}
} :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
DB.prototype._getCollectionInfosCommand@src/mongo/shell/db.js:941:1
DB.prototype.getCollectionInfos@src/mongo/shell/db.js:953:19
DB.prototype.getCollectionNames@src/mongo/shell/db.js:964:16
shellHelper.show@src/mongo/shell/utils.js:853:9
shellHelper@src/mongo/shell/utils.js:750:15
@(shellhelp2):1:1
2019-12-26T18:46:02.911+0000 I NETWORK [thread1] Marking host mongodb-replicaset-0.mongodb-replicaset.default.svc.cluster.local:27017 as failed :: caused by :: Location40657: Last known master host cannot be reached
2019-12-26T18:46:03.818+0000 D NETWORK [thread1] creating new connection to:mongodb-replicaset-0.mongodb-replicaset.default.svc.cluster.local:27017
2019-12-26T18:46:03.951+0000 D NETWORK [thread1] connected to server mongodb-replicaset-0.mongodb-replicaset.default.svc.cluster.local:27017 (10.132.0.26)
2019-12-26T18:46:04.086+0000 D NETWORK [thread1] connected connection!
rs0:SECONDARY> 2019-12-26T18:46:24.532+0000 D NETWORK [ReplicaSetMonitor-TaskExecutor-0] Refreshing replica set rs0 took 273 msec
此错误继续，直到重新连接到主节点。 当我连接时，这是rs.status：
{
"set" : "rs0",
"date" : ISODate("2019-12-26T18:47:20.196Z"),
"myState" : 2,
"term" : NumberLong(3),
"syncingTo" : "mongodb-replicaset-1.mongodb-replicaset.default.svc.cluster.local:27017",
"syncSourceHost" : "mongodb-replicaset-1.mongodb-replicaset.default.svc.cluster.local:27017",
"syncSourceId" : 1,
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1577386039, 1),
"t" : NumberLong(3)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1577386039, 1),
"t" : NumberLong(3)
},
"appliedOpTime" : {
"ts" : Timestamp(1577386039, 1),
"t" : NumberLong(3)
},
"durableOpTime" : {
"ts" : Timestamp(1577386039, 1),
"t" : NumberLong(3)
}
},
"members" : [
{
"_id" : 0,
"name" : "mongodb-replicaset-0.mongodb-replicaset.default.svc.cluster.local:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 1852,
"optime" : {
"ts" : Timestamp(1577386029, 1),
"t" : NumberLong(3)
},
"optimeDurable" : {
"ts" : Timestamp(1577386029, 1),
"t" : NumberLong(3)
},
"optimeDate" : ISODate("2019-12-26T18:47:09Z"),
"optimeDurableDate" : ISODate("2019-12-26T18:47:09Z"),
"lastHeartbeat" : ISODate("2019-12-26T18:47:18.867Z"),
"lastHeartbeatRecv" : ISODate("2019-12-26T18:47:19.003Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "mongodb-replicaset-2.mongodb-replicaset.default.svc.cluster.local:27017",
"syncSourceHost" : "mongodb-replicaset-2.mongodb-replicaset.default.svc.cluster.local:27017",
"syncSourceId" : 2,
"infoMessage" : "",
"configVersion" : 3
},
{
"_id" : 1,
"name" : "mongodb-replicaset-1.mongodb-replicaset.default.svc.cluster.local:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 1883,
"optime" : {
"ts" : Timestamp(1577386029, 1),
"t" : NumberLong(3)
},
"optimeDurable" : {
"ts" : Timestamp(1577386029, 1),
"t" : NumberLong(3)
},
"optimeDate" : ISODate("2019-12-26T18:47:09Z"),
"optimeDurableDate" : ISODate("2019-12-26T18:47:09Z"),
"lastHeartbeat" : ISODate("2019-12-26T18:47:18.645Z"),
"lastHeartbeatRecv" : ISODate("2019-12-26T18:47:19.960Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1577384177, 1),
"electionDate" : ISODate("2019-12-26T18:16:17Z"),
"configVersion" : 3
},
{
"_id" : 2,
"name" : "mongodb-replicaset-2.mongodb-replicaset.default.svc.cluster.local:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 1915,
"optime" : {
"ts" : Timestamp(1577386039, 1),
"t" : NumberLong(3)
},
"optimeDate" : ISODate("2019-12-26T18:47:19Z"),
"syncingTo" : "mongodb-replicaset-1.mongodb-replicaset.default.svc.cluster.local:27017",
"syncSourceHost" : "mongodb-replicaset-1.mongodb-replicaset.default.svc.cluster.local:27017",
"syncSourceId" : 1,
"infoMessage" : "",
"configVersion" : 3,
"self" : true,
"lastHeartbeatMessage" : ""
}
],
"ok" : 1,
"operationTime" : Timestamp(1577386039, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1577386039, 1),
"signature" : {
"hash" : BinData(0,"0cfmxLzpPXfsvCW2R2DlTnSxlm8="),
"keyId" : NumberLong("6774321924500619265")
}
}
}
因此，似乎所有副本集都正常。 我必须从主服务器读取，因此必须使用默认值“读取首选项”。
现在到了棘手的部分。根据错误： “无法访问最后一个已知的主主机” 并查看代码，看来mongo尝试转到“主要”，但失败了，这是mongo客户端中的代码
BClientConnection* DBClientReplicaSet::checkMaster() {
ReplicaSetMonitorPtr monitor = _getMonitor();
HostAndPort h = monitor->getMasterOrUassert();
if (h == _masterHost && _master) {
// a master is selected. let's just make sure connection didn't die
if (!_master->isFailed())
return _master.get();
monitor->failedHost(_masterHost,
{ErrorCodes::Error(40657), "Last known master host cannot be reached"});
h = monitor->getMasterOrUassert(); // old master failed, try again.
}
我在做什么错？还是我应该检查什么？