1. 云图网首页
  2. 技术专区
  3. 数据库

MongoDB：Replica Set 删除节点

• 数据库

上一篇学习了 Replica Set 增加节点，继续学习删除节点。

删除节点前最好是先关闭需要删除的节点，之后通过命令 rs.remove 来删除相应的节点，操作如下：

1 查看当前 Replica Set 配置

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
 
[mongo@redhatB mongodb]$ mongo 127.0.0.1:27018  
MongoDB shell version: 2.2.1  
connecting to: 127.0.0.1:27018/test  

rs0:PRIMARY> rs.conf();  
{  
 "_id" : "rs0",  
 "version" : 4,  
 "members" : [  
 {  
 "_id" : 0,  
 "host" : "redhatB.example.com:27018"  
 },  
 {  
 "_id" : 1,  
 "host" : "redhatB.example.com:27019"  
 },  
 {  
 "_id" : 2,  
 "host" : "redhatB.example.com:27020"  
 },  
 {  
 "_id" : 3,  
 "host" : "redhatB.example.com:27021"  
 }  
 ]  
}

备注：计划删除节点 “_id” : 3。

2 关闭 27021 节点服务

1
2
3
4
5
 
[mongo@redhatB data04]$ ps -ef | grep 27021  
mongo 11733 1 0 21:03 ? 00:00:15 mongod -f /pgdata_xc/mongodb/data04/mongodb_27021.conf  
mongo 14422 2953 0 21:53 pts/0 00:00:00 mongo 127.0.0.1:27021  
mongo 14490 4027 0 21:54 pts/1 00:00:00 grep 27021  
[mongo@redhatB data04]$ kill 11733

3 查看 Replica Set 状态

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
 
rs0:PRIMARY> rs.status();  
{  
 "set" : "rs0",  
 "date" : ISODate("2012-11-22T13:57:15Z"),  
 "myState" : 1,  
 "members" : [  
 {  
 "_id" : 0,  
 "name" : "redhatB.example.com:27018",  
 "health" : 1,  
 "state" : 1,  
 "stateStr" : "PRIMARY",  
 "uptime" : 21279,  
 "optime" : Timestamp(1353589624000, 1),  
 "optimeDate" : ISODate("2012-11-22T13:07:04Z"),  
 "self" : true  
 },  
 {  
 "_id" : 1,  
 "name" : "redhatB.example.com:27019",  
 "health" : 1,  
 "state" : 2,  
 "stateStr" : "SECONDARY",  
 "uptime" : 18908,  
 "optime" : Timestamp(1353589624000, 1),  
 "optimeDate" : ISODate("2012-11-22T13:07:04Z"),  
 "lastHeartbeat" : ISODate("2012-11-22T13:57:13Z"),  
 "pingMs" : 0  
 },  
 {  
 "_id" : 2,  
 "name" : "redhatB.example.com:27020",  
 "health" : 1,  
 "state" : 2,  
 "stateStr" : "SECONDARY",  
 "uptime" : 18900,  
 "optime" : Timestamp(1353589624000, 1),  
 "optimeDate" : ISODate("2012-11-22T13:07:04Z"),  
 "lastHeartbeat" : ISODate("2012-11-22T13:57:14Z"),  
 "pingMs" : 0  
 },  
 {  
 "_id" : 3,  
 "name" : "redhatB.example.com:27021",  
 "health" : 0,  
 "state" : 8,  
 "stateStr" : "(not reachable/healthy)",  
 "uptime" : 0,  
 "optime" : Timestamp(1353589624000, 1),  
 "optimeDate" : ISODate("2012-11-22T13:07:04Z"),  
 "lastHeartbeat" : ISODate("2012-11-22T13:55:20Z"),  
 "pingMs" : 0,  
 "errmsg" : "socket exception [CONNECT_ERROR] for redhatB.example.com:27021"  
 }  
 ],  
 "ok" : 1  
}

备注：最后一个节点 stateStr 状态为 “not reachable/healthy”。

4 删除节点

1
2
3
4
5
6
7
8
 
rs0:PRIMARY> rs.remove("redhatB.example.com:27021");  
Thu Nov 22 21:58:45 DBClientCursor::init call() failed  
Thu Nov 22 21:58:45 query failed : admin.$cmd { replSetReconfig: { _id: "rs0", version: 5, members: [ { _id: 0, host: "redhatB.example.com:27018" }, { _id: 1, host: "redhatB.example.com:27019" }, { _id: 2, host: "redhatB.example.com:27020" } ] } } to: 127.0.0.1:27018  
Thu Nov 22 21:58:45 Error: error doing query: failed src/mongo/shell/collection.js:155  
Thu Nov 22 21:58:45 trying reconnect to 127.0.0.1:27018  
Thu Nov 22 21:58:45 reconnect 127.0.0.1:27018 ok  
rs0:SECONDARY>  
rs0:PRIMARY>

5 再次查看 Replica Set 配置

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
rs0:PRIMARY> rs.conf();  
{  
 "_id" : "rs0",  
 "version" : 5,  
 "members" : [  
 {  
 "_id" : 0,  
 "host" : "redhatB.example.com:27018"  
 },  
 {  
 "_id" : 1,  
 "host" : "redhatB.example.com:27019"  
 },  
 {  
 "_id" : 2,  
 "host" : "redhatB.example.com:27020"  
 }  
 ]  
}

备注：节点 “redhatB.example.com:27021” 已删除。

6 删除旧结点数据目录

[mongo@redhatB mongodb]$ rm -rf /mongodb/data04

7 参考

http://docs.mongodb.org/manual/administration/replica-sets/#replica-set-admin-procedure-add-member
http://docs.mongodb.org/manual/reference/javascript/#rs.remove

原创文章，作者：306829225，如若转载，请注明出处：https://blog.ytso.com/237923.html

赞 (0)
0
上一篇 2022年1月29日
下一篇 2022年1月29日

相关推荐

发表回复

登录后才能评论