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:

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  1. arps:PRIMARY> config=rs.conf()                //查看当前配置，存入config变量中。
  2. arps:PRIMARY> config.members[2].priority = 3  //修改config变量，第三组成员的优先级为3.
  3. arps:PRIMARY> rs.reconfig(config)             //配置生效                       
  4. ......
  5. ......
  6. 2017-12-22T15:19:56.596+0800 I NETWORK trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed
  7. 2017-12-22T15:19:56.597+0800 I NETWORK reconnect 127.0.0.1:27017 (127.0.0.1) ok
  9. arps:SECONDARY> rs.conf()                    //查看当前配置
  10. {
  11.         "_id" : "arps",
  12.         "version" : 4,
  13.         "members" : [
  14.                 {
  15.                         "_id" : 0,
  16.                         "host" : "172.17.4.37:27017",
  17.                         "arbiterOnly" : false,
  18.                         "buildIndexes" : true,
  19.                         "hidden" : false,
  20.                         "priority" : 1,
  21.                         "tags" : {
  23.                         },
  24.                         "slaveDelay" : 0,
  25.                         "votes" : 1
  26.                 },
  27.                 {
  28.                         "_id" : 1,
  29.                         "host" : "172.17.4.38:27017",
  30.                         "arbiterOnly" : false,
  31.                         "buildIndexes" : true,
  32.                         "hidden" : false,
  33.                         "priority" : 1,
  34.                         "tags" : {
  36.                         },
  37.                         "slaveDelay" : 0,
  38.                         "votes" : 1
  39.                 },
  40.                 {
  41.                         "_id" : 2,
  42.                         "host" : "172.17.4.39:27017",
  43.                         "arbiterOnly" : false,
  44.                         "buildIndexes" : true,
  45.                         "hidden" : false,
  46.                         "priority" : 3,             //优先级变为3
  47.                         "tags" : {
  49.                         },
  50.                         "slaveDelay" : 0,
  51.                         "votes" : 1
  52.                 }
  53.         ],
  54.         "settings" : {
  55.                 "chainingAllowed" : true,
  56.                 "heartbeatTimeoutSecs" : 10,
  57.                 "getLastErrorModes" : {
  59.                 },
  60.                 "getLastErrorDefaults" : {
  61.                         "w" : 1,
  62.                         "wtimeout" : 0
  63.                 }
  64.         }
  65. }
  67. arps:SECONDARY> rs.status()
  68. {
  69.         "set" : "arps",
  70.         "date" : ISODate("2017-12-22T07:25:04.641Z"),
  71.         "myState" : 2,
  72.         "syncingTo" : "172.17.4.39:27017",
  73.         "members" : [
  74.                 {
  75.                         "_id" : 0,
  76.                         "name" : "172.17.4.37:27017",
  77.                         "health" : 1,
  78.                         "state" : 2,
  79.                         "stateStr" : "SECONDARY",
  80.                         "uptime" : 7597536,
  81.                         "optime" : Timestamp(1513927481, 3),
  82.                         "optimeDate" : ISODate("2017-12-22T07:24:41Z"),
  83.                         "syncingTo" : "172.17.4.39:27017",
  84.                         "configVersion" : 4,
  85.                         "self" : true
  86.                 },
  87.                 {
  88.                         "_id" : 1,
  89.                         "name" : "172.17.4.38:27017",
  90.                         "health" : 1,
  91.                         "state" : 2,
  92.                         "stateStr" : "SECONDARY",
  93.                         "uptime" : 7597426,
  94.                         "optime" : Timestamp(1513927481, 3),
  95.                         "optimeDate" : ISODate("2017-12-22T07:24:41Z"),
  96.                         "lastHeartbeat" : ISODate("2017-12-22T07:25:02.961Z"),
  97.                         "lastHeartbeatRecv" : ISODate("2017-12-22T07:25:04.091Z"),
  98.                         "pingMs" : 0,
  99.                         "syncingTo" : "172.17.4.39:27017",
  100.                         "configVersion" : 4
  101.                 },
  102.                 {
  103.                         "_id" : 2,
  104.                         "name" : "172.17.4.39:27017",
  105.                         "health" : 1,
  106.                         "state" : 1,
  107.                         "stateStr" : "PRIMARY",    //最后一个节点升级为PRIMARY
  108.                         "uptime" : 3202,
  109.                         "optime" : Timestamp(1513927481, 3),
  110.                         "optimeDate" : ISODate("2017-12-22T07:24:41Z"),
  111.                         "lastHeartbeat" : ISODate("2017-12-22T07:25:02.951Z"),
  112.                         "lastHeartbeatRecv" : ISODate("2017-12-22T07:25:04.344Z"),
  113.                         "pingMs" : 0,
  114.                         "electionTime" : Timestamp(1513927190, 2),
  115.                         "electionDate" : ISODate("2017-12-22T07:19:50Z"),
  116.                         "configVersion" : 4
  117.                 }
  118.         ],
  119.         "ok" : 1
  120. }
 
整理自：
https://www.cnblogs.com/ivictor/p/6804408.html
http://blog.chinaunix.net/uid-26446098-id-5781440.html
 posted on 2019-08-08 11:38  xibuhaohao  阅读(6856)  评论(0)  编辑  收藏  举报