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

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
8. arps:SECONDARY> rs.conf()                    //查看当前配置
9. {
10. "_id" : "arps",
11. "version" : 4,
12. "members" : [
13. {
14. "_id" : 0,
15. "host" : "172.17.4.37:27017",
16. "arbiterOnly" : false,
17. "buildIndexes" : true,
18. "hidden" : false,
19. "priority" : 1,
20. "tags" : {
21. },
22. "slaveDelay" : 0,
23. "votes" : 1
24. },
25. {
26. "_id" : 1,
27. "host" : "172.17.4.38:27017",
28. "arbiterOnly" : false,
29. "buildIndexes" : true,
30. "hidden" : false,
31. "priority" : 1,
32. "tags" : {
33. },
34. "slaveDelay" : 0,
35. "votes" : 1
36. },
37. {
38. "_id" : 2,
39. "host" : "172.17.4.39:27017",
40. "arbiterOnly" : false,
41. "buildIndexes" : true,
42. "hidden" : false,
43. "priority" : 3,             //优先级变为3
44. "tags" : {
45. },
46. "slaveDelay" : 0,
47. "votes" : 1
48. }
49. ],
50. "settings" : {
51. "chainingAllowed" : true,
52. "heartbeatTimeoutSecs" : 10,
53. "getLastErrorModes" : {
54. },
55. "getLastErrorDefaults" : {
56. "w" : 1,
57. "wtimeout" : 0
58. }
59. }
60. }
61. arps:SECONDARY> rs.status()
62. {
63. "set" : "arps",
64. "date" : ISODate("2017-12-22T07:25:04.641Z"),
65. "myState" : 2,
66. "syncingTo" : "172.17.4.39:27017",
67. "members" : [
68. {
69. "_id" : 0,
70. "name" : "172.17.4.37:27017",
71. "health" : 1,
72. "state" : 2,
73. "stateStr" : "SECONDARY",
74. "uptime" : 7597536,
75. "optime" : Timestamp(1513927481, 3),
76. "optimeDate" : ISODate("2017-12-22T07:24:41Z"),
77. "syncingTo" : "172.17.4.39:27017",
78. "configVersion" : 4,
79. "self" : true
80. },
81. {
82. "_id" : 1,
83. "name" : "172.17.4.38:27017",
84. "health" : 1,
85. "state" : 2,
86. "stateStr" : "SECONDARY",
87. "uptime" : 7597426,
88. "optime" : Timestamp(1513927481, 3),
89. "optimeDate" : ISODate("2017-12-22T07:24:41Z"),
90. "lastHeartbeat" : ISODate("2017-12-22T07:25:02.961Z"),
91. "lastHeartbeatRecv" : ISODate("2017-12-22T07:25:04.091Z"),
92. "pingMs" : 0,
93. "syncingTo" : "172.17.4.39:27017",
94. "configVersion" : 4
95. },
96. {
97. "_id" : 2,
98. "name" : "172.17.4.39:27017",
99. "health" : 1,
100. "state" : 1,
101. "stateStr" : "PRIMARY",    //最后一个节点升级为PRIMARY
102. "uptime" : 3202,
103. "optime" : Timestamp(1513927481, 3),
104. "optimeDate" : ISODate("2017-12-22T07:24:41Z"),
105. "lastHeartbeat" : ISODate("2017-12-22T07:25:02.951Z"),
106. "lastHeartbeatRecv" : ISODate("2017-12-22T07:25:04.344Z"),
107. "pingMs" : 0,
108. "electionTime" : Timestamp(1513927190, 2),
109. "electionDate" : ISODate("2017-12-22T07:19:50Z"),
110. "configVersion" : 4
111. }
112. ],
113. "ok" : 1
114. }

 

整理自：

https://www.cnblogs.com/ivictor/p/6804408.html

http://blog.chinaunix.net/uid-26446098-id-5781440.html