【MongoDB学习笔记32】MongoDB修改副本集配置
一、删除副本集成员
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spock:PRIMARY> rs.config()
{
"_id" : "spock",
"version" : 1,
"members" : [
{
"_id" : 0,
"host" : "192.168.1.112:27017"
},
{
"_id" : 1,
"host" : "192.168.1.113:27017"
}
]
}
spock:PRIMARY> rs.remove("192.168.1.113:27017")
{
"errmsg" : "exception: can't find self in new replset config",
"code" : 13433,
"ok" : 0
}
spock:PRIMARY> rs.remove("192.168.1.112:27017")
2015-02-02T21:59:13.303+0800 DBClientCursor::init call() failed
2015-02-02T21:59:13.304+0800 Error: error doing query: failed at src/mongo/shell/query.js:81
2015-02-02T21:59:13.305+0800 trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed
2015-02-02T21:59:13.308+0800 reconnect 127.0.0.1:27017 (127.0.0.1) ok
spock:PRIMARY> rs.config()
{
"_id" : "spock",
"version" : 2,
"members" : [
{
"_id" : 1,
"host" : "192.168.1.113:27017"
}
]
}
二、添加副本集成员
spock:PRIMARY> rs.add("192.168.1.112:27017")
{ "ok" : 1 }
spock:PRIMARY> rs.config()
{
"_id" : "spock",
"version" : 3,
"members" : [
{
"_id" : 1,
"host" : "192.168.1.113:27017"
},
{
"_id" : 2,
"host" : "192.168.1.112:27017"
}
]
}
从上述过程来看，配置文档中version字段都会自增，它的初始值为1；
三、或者通过rs.reconfig()函数修改副本集
例如，将host用主机名来替代ip地址
[root@localhost ~]# ping host113
PING host113 (192.168.1.113) 56(84) bytes of data.
64 bytes from host113 (192.168.1.113): icmp_seq=1 ttl=64 time=0.060 ms
64 bytes from host113 (192.168.1.113): icmp_seq=2 ttl=64 time=0.030 ms
64 bytes from host113 (192.168.1.113): icmp_seq=3 ttl=64 time=0.026 ms
64 bytes from host113 (192.168.1.113): icmp_seq=4 ttl=64 time=1.04 ms
--- host113 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3001ms
rtt min/avg/max/mdev = 0.026/0.289/1.041/0.434 ms
[root@localhost ~]# mongo
MongoDB shell version: 2.6.7
connecting to: test
spock:PRIMARY> rs.config()
{
"_id" : "spock",
"version" : 3,
"members" : [
{ "_id" : 1, "host" : "192.168.1.113:27017"},
{ "_id" : 2, "host" : "192.168.1.112:27017"}
]
}
spock:PRIMARY> var config=rs.config()
spock:PRIMARY> config.members[0].host="host113:27017"
host113:27017
spock:PRIMARY> rs.reconfig(config)
2015-02-02T22:21:22.793+0800 DBClientCursor::init call() failed
2015-02-02T22:21:22.795+0800 trying reconnect to 127.0.0.1:27017 (127.0.0.1) faile
2015-02-02T22:21:22.797+0800 reconnect 127.0.0.1:27017 (127.0.0.1) ok
reconnected to server after rs command (which is normal)
spock:PRIMARY> rs.config()
{
"_id" : "spock",
"version" : 4,
"members" : [
{ "_id" : 1,"host" : "host113:27017"},
{ "_id" : 2, "host" : "192.168.1.112:27017"}
]
}
spock:PRIMARY>
对于复杂的副本集配置，rs.reconfig函数修改比rs.add和rs.remove更有用；
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