MongoDB 副本集主从切换方法

一、方法一rs.setpDown()

将Primary节点降级为Secondary节点

myapp:PRIMARY> rs.stepDown()

这个命令会让primary降级为Secondary节点，并维持60s，如果这段时间内没有新的primary被选举出来，这个节点可以要求重新进行选举。

也可手动指定时间

myapp:PRIMARY> rs.stepDown(30)

在执行完该命令后，原Secondary node3:27017升级为Primary。

二、方法二优先级设置

思路:
1.为了保证数据的一致性，必须先关闭应用的写服务。
2.提升要升级为Primary节点的Secondary节点的优先级。

操作如下:

点击(此处)折叠或打开

  • arps:PRIMARY> config=rs.conf()                //查看当前配置，存入config变量中。
  • arps:PRIMARY> config.members[2].priority = 3  //修改config变量，第三组成员的优先级为3.
  • arps:PRIMARY> rs.reconfig(config)             //配置生效                       
  • ......
  • ......
  • 2017-12-22T15:19:56.596+0800 I NETWORK trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed
  • 2017-12-22T15:19:56.597+0800 I NETWORK reconnect 127.0.0.1:27017 (127.0.0.1) ok
  • arps:SECONDARY> rs.conf()                    //查看当前配置
  • {
  •         "_id" : "arps",
  •         "version" : 4,
  •         "members" : [
  •                 {
  •                         "_id" : 0,
  •                         "host" : "172.17.4.37:27017",
  •                         "arbiterOnly" : false,
  •                         "buildIndexes" : true,
  •                         "hidden" : false,
  •                         "priority" : 1,
  •                         "tags" : {
  •                         },
  •                         "slaveDelay" : 0,
  •                         "votes" : 1
  •                 },
  •                 {
  •                         "_id" : 1,
  •                         "host" : "172.17.4.38:27017",
  •                         "arbiterOnly" : false,
  •                         "buildIndexes" : true,
  •                         "hidden" : false,
  •                         "priority" : 1,
  •                         "tags" : {
  •                         },
  •                         "slaveDelay" : 0,
  •                         "votes" : 1
  •                 },
  •                 {
  •                         "_id" : 2,
  •                         "host" : "172.17.4.39:27017",
  •                         "arbiterOnly" : false,
  •                         "buildIndexes" : true,
  •                         "hidden" : false,
  •                         "priority" : 3,             //优先级变为3
  •                         "tags" : {
  •                         },
  •                         "slaveDelay" : 0,
  •                         "votes" : 1
  •                 }
  •         ],
  •         "settings" : {
  •                 "chainingAllowed" : true,
  •                 "heartbeatTimeoutSecs" : 10,
  •                 "getLastErrorModes" : {
  •                 },
  •                 "getLastErrorDefaults" : {
  •                         "w" : 1,
  •                         "wtimeout" : 0
  •                 }
  •         }
  • }
  • arps:SECONDARY> rs.status()
  • {
  •         "set" : "arps",
  •         "date" : ISODate("2017-12-22T07:25:04.641Z"),
  •         "myState" : 2,
  •         "syncingTo" : "172.17.4.39:27017",
  •         "members" : [
  •                 {
  •                         "_id" : 0,
  •                         "name" : "172.17.4.37:27017",
  •                         "health" : 1,
  •                         "state" : 2,
  •                         "stateStr" : "SECONDARY",
  •                         "uptime" : 7597536,
  •                         "optime" : Timestamp(1513927481, 3),
  •                         "optimeDate" : ISODate("2017-12-22T07:24:41Z"),
  •                         "syncingTo" : "172.17.4.39:27017",
  •                         "configVersion" : 4,
  •                         "self" : true
  •                 },
  •                 {
  •                         "_id" : 1,
  •                         "name" : "172.17.4.38:27017",
  •                         "health" : 1,
  •                         "state" : 2,
  •                         "stateStr" : "SECONDARY",
  •                         "uptime" : 7597426,
  •                         "optime" : Timestamp(1513927481, 3),
  •                         "optimeDate" : ISODate("2017-12-22T07:24:41Z"),
  •                         "lastHeartbeat" : ISODate("2017-12-22T07:25:02.961Z"),
  •                         "lastHeartbeatRecv" : ISODate("2017-12-22T07:25:04.091Z"),
  •                         "pingMs" : 0,
  •                         "syncingTo" : "172.17.4.39:27017",
  •                         "configVersion" : 4
  •                 },
  •                 {
  •                         "_id" : 2,
  •                         "name" : "172.17.4.39:27017",
  •                         "health" : 1,
  •                         "state" : 1,
  •                         "stateStr" : "PRIMARY",    //最后一个节点升级为PRIMARY
  •                         "uptime" : 3202,
  •                         "optime" : Timestamp(1513927481, 3),
  •                         "optimeDate" : ISODate("2017-12-22T07:24:41Z"),
  •                         "lastHeartbeat" : ISODate("2017-12-22T07:25:02.951Z"),
  •                         "lastHeartbeatRecv" : ISODate("2017-12-22T07:25:04.344Z"),
  •                         "pingMs" : 0,
  •                         "electionTime" : Timestamp(1513927190, 2),
  •                         "electionDate" : ISODate("2017-12-22T07:19:50Z"),
  •                         "configVersion" : 4
  •                 }
  •         ],
  •         "ok" : 1
  • }
    •  
    整理自：
    https://www.cnblogs.com/ivictor/p/6804408.html
    http://blog.chinaunix.net/uid-26446098-id-5781440.html

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