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MongoDB切换主节点技巧

作者：UStarGao 日期：2022-10-01 22:27:12 人气： 栏目：MongoDB

1、需求与现有副本集情况介绍

背景：业务侧针对MongoDB副本集的一个Secondary节点B进行了改配操作，由于改配后的B节点，配置高，性能好，业务想以最短的时间，最小的代价把B节点提升为Primary主节点。

现有MongoDB 5节点副本集集群采用UCloud云数据库，节点信息如下：即节点A：192.168.0.182 Primary节点；B：192.168.0.240 Secondary节点；C：192.168.0.217 Secondary节点；D：192.168.0.60；E：192.168.0.145 arbiter节点。

2-22100113511Y94.png

2、配置调整

（1）查看当前副本集角色

udb-a0r3omr444m:PRIMARY> rs.status()
{
  "set" : "udb-a0r3omr444m",
  "date" : ISODate("2022-10-01T05:53:11.213Z"),
  "myState" : 1,
  "term" : NumberLong(1),
  "syncingTo" : "",
  "syncSourceHost" : "",
  "syncSourceId" : -1,
  "heartbeatIntervalMillis" : NumberLong(2000),
  "optimes" : {
    "lastCommittedOpTime" : {
    "ts" : Timestamp(1664603583, 1),
    "t" : NumberLong(1)
    },
    "readConcernMajorityOpTime" : {
      "ts" : Timestamp(1664603583, 1),
      "t" : NumberLong(1)
    },
    "appliedOpTime" : {
      "ts" : Timestamp(1664603583, 1),
      "t" : NumberLong(1)
    },
    "durableOpTime" : {
      "ts" : Timestamp(1664603583, 1),
      "t" : NumberLong(1)
    }
  },
  "lastStableCheckpointTimestamp" : Timestamp(1664603543, 1),
  "members" : [
  {
    "_id" : 0,
    "name" : "192.168.0.182:27017",
    "health" : 1,
    "state" : 1,
    "stateStr" : "PRIMARY",
    "uptime" : 786,
    "optime" : {
      "ts" : Timestamp(1664603583, 1),
      "t" : NumberLong(1)
    },
    "optimeDate" : ISODate("2022-10-01T05:53:03Z"),
    "syncingTo" : "",
    "syncSourceHost" : "",
    "syncSourceId" : -1,
    "infoMessage" : "",
    "electionTime" : Timestamp(1664602821, 2),
    "electionDate" : ISODate("2022-10-01T05:40:21Z"),
    "configVersion" : 5,
    "self" : true,
    "lastHeartbeatMessage" : ""
  },
  {
    "_id" : 1,
    "name" : "192.168.0.240:27017",
    "health" : 1,
    "state" : 2,
    "stateStr" : "SECONDARY",
    "uptime" : 729,
    "optime" : {
        "ts" : Timestamp(1664603583, 1),
        "t" : NumberLong(1)
    },
    "optimeDurable" : {
        "ts" : Timestamp(1664603583, 1),
        "t" : NumberLong(1)
    },
    "optimeDate" : ISODate("2022-10-01T05:53:03Z"),
    "optimeDurableDate" : ISODate("2022-10-01T05:53:03Z"),
    "lastHeartbeat" : ISODate("2022-10-01T05:53:09.400Z"),
    "lastHeartbeatRecv" : ISODate("2022-10-01T05:53:09.907Z"),
    "pingMs" : NumberLong(0),
    "lastHeartbeatMessage" : "",
    "syncingTo" : "192.168.0.182:27017",
    "syncSourceHost" : "192.168.0.182:27017",
    "syncSourceId" : 0,
    "infoMessage" : "",
    "configVersion" : 5
  },
  {
    "_id" : 2,
    "name" : "192.168.0.145:27017",
    "health" : 1,
    "state" : 7,
    "stateStr" : "ARBITER",
    "uptime" : 724,
    "lastHeartbeat" : ISODate("2022-10-01T05:53:09.384Z"),
    "lastHeartbeatRecv" : ISODate("2022-10-01T05:53:09.410Z"),
    "pingMs" : NumberLong(0),
    "lastHeartbeatMessage" : "",
    "syncingTo" : "",
    "syncSourceHost" : "",
    "syncSourceId" : -1,
    "infoMessage" : "",
    "configVersion" : 5
  },
  {
    "_id" : 3,
    "name" : "192.168.0.217:27017",
    "health" : 1,
    "state" : 2,
    "stateStr" : "SECONDARY",
    "uptime" : 686,
    "optime" : {
    "ts" : Timestamp(1664603583, 1),
    "t" : NumberLong(1)
  },
  "optimeDurable" : {
    "ts" : Timestamp(1664603583, 1),
    "t" : NumberLong(1)
  },
  "optimeDate" : ISODate("2022-10-01T05:53:03Z"),
  "optimeDurableDate" : ISODate("2022-10-01T05:53:03Z"),
  "lastHeartbeat" : ISODate("2022-10-01T05:53:09.379Z"),
  "lastHeartbeatRecv" : ISODate("2022-10-01T05:53:09.910Z"),
  "pingMs" : NumberLong(0),
  "lastHeartbeatMessage" : "",
  "syncingTo" : "192.168.0.182:27017",
  "syncSourceHost" : "192.168.0.182:27017",
  "syncSourceId" : 0,
  "infoMessage" : "",
  "configVersion" : 5
  },
  {
    "_id" : 4,
    "name" : "192.168.0.60:27017",
    "health" : 1,
    "state" : 2,
    "stateStr" : "SECONDARY",
    "uptime" : 685,
    "optime" : {
      "ts" : Timestamp(1664603583, 1),
      "t" : NumberLong(1)
    },
    "optimeDurable" : {
      "ts" : Timestamp(1664603583, 1),
      "t" : NumberLong(1)
    },
    "optimeDate" : ISODate("2022-10-01T05:53:03Z"),
    "optimeDurableDate" : ISODate("2022-10-01T05:53:03Z"),
    "lastHeartbeat" : ISODate("2022-10-01T05:53:09.408Z"),
    "lastHeartbeatRecv" : ISODate("2022-10-01T05:53:09.956Z"),
    "pingMs" : NumberLong(0),
    "lastHeartbeatMessage" : "",
    "syncingTo" : "192.168.0.240:27017",
    "syncSourceHost" : "192.168.0.240:27017",
    "syncSourceId" : 1,
    "infoMessage" : "",
    "configVersion" : 5
  }
    ],
  "ok" : 1,
  "operationTime" : Timestamp(1664603583, 1),
  "$clusterTime" : {
    "clusterTime" : Timestamp(1664603583, 1),
    "signature" : {
      "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
      "keyId" : NumberLong(0)
    }
  }
}

（2）C节点冻结120s

[root@blogs-v2 ~]# mongo 192.168.0.217:27017/admin -u root -p
MongoDB shell version v4.0.27
Enter password: 
connecting to: mongodb://192.168.0.217:27017/admin?gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("b0714374-1a2a-41f5-9592-9a5ee8f18c2d") }
MongoDB server version: 4.0.3
udb-a0r3omr444m:SECONDARY>
udb-a0r3omr444m:SECONDARY> rs.freeze(120)         # C节点冻结120s
{
  "ok" : 1,
  "operationTime" : Timestamp(1664603883, 1),
  "$clusterTime" : {
    "clusterTime" : Timestamp(1664603883, 1),
    "signature" : {
      "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
      "keyId" : NumberLong(0)
    }
  }
}

（3）D节点冻结120s

[root@blogs-v2 ~]# mongo 192.168.0.60:27017/admin -u root -p
MongoDB shell version v4.0.27
Enter password: 
connecting to: mongodb://192.168.0.60:27017/admin?gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("184f5eff-bfa9-4db9-87ab-54911a6897ff") }
MongoDB server version: 4.0.3
udb-a0r3omr444m:SECONDARY> 
udb-a0r3omr444m:SECONDARY> rs.freeze(120)         # D节点冻结120s
{
  "ok" : 1,
  "operationTime" : Timestamp(1664603883, 1),
  "$clusterTime" : {
    "clusterTime" : Timestamp(1664603883, 1),
    "signature" : {
      "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
      "keyId" : NumberLong(0)
    }
  }
}

（4）A节点降级120s

[root@blogs-v2 ~]# mongo 192.168.0.182:27017/admin -u root -p
MongoDB shell version v4.0.27
Enter password: 
connecting to: mongodb://192.168.0.182:27017/admin?gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("cf937160-092d-4073-8788-562e7b928d50") }
MongoDB server version: 4.0.3
udb-a0r3omr444m:PRIMARY> 
udb-a0r3omr444m:PRIMARY> rs.stepDown(120)        # 降级当前主节点，120s内不参与选举
2022-10-01T13:57:13.566+0800 I NETWORK  [js] DBClientConnection failed to receive message from 192.168.0.182:27017 - HostUnreachable: Connection closed by peer
2022-10-01T13:57:13.566+0800 E QUERY    [js] Error: error doing query: failed: network error while attempting to run command 'replSetStepDown' on host '192.168.0.182:27017'  :
DB.prototype.runCommand@src/mongo/shell/db.js:170:1
DB.prototype.adminCommand@src/mongo/shell/db.js:187:1
rs.stepDown@src/mongo/shell/utils.js:1505:12
@(shell):1:1
2022-10-01T13:57:13.568+0800 I NETWORK  [js] trying reconnect to 192.168.0.182:27017 failed
2022-10-01T13:57:13.572+0800 I NETWORK  [js] reconnect 192.168.0.182:27017 ok

（5）查看B节点选举情况

[root@blogs-v2 ~]# mongo 192.168.0.240:27017/admin -u root -p
MongoDB shell version v4.0.27
Enter password: 
connecting to: mongodb://192.168.0.240:27017/admin?gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("3416021c-089e-4927-9c60-775a9a692b22") }
MongoDB server version: 4.0.3
udb-a0r3omr444m:PRIMARY>

注：可以看出此时B节点已经是Primary节点了，选举非常迅速！！！

（6）查看控制台集群属性

2-22100114055La.png

注：至此，MongoDB副本集节点切换完毕。

标签： MongoDB手动切换主从MongoDB主节点切换MongoDB primary节点与secondary节点切换
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