栏目头部广告

MongoDB切换主节点技巧

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。

image.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

image.png

注:至此,MongoDB副本集节点切换完毕。

作者:UStarGao
链接:https://www.starcto.com/mongodb/310.html
来源:STARCTO
著作权归作者所有。商业转载请联系作者获得授权,非商业转载请注明出处

UCloud云平台推荐


UCloud新用户专属注册连接

UCloud CDN超值特惠专场

UCloud全球云主机(UHost/VPS)大促页面

UCloud快杰云主机大促页面

加载中~
文章详情页广告

随便看看

底部广告
`