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、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
注:至此,MongoDB副本集节点切换完毕。
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