【MongoDB学习笔记32】MongoDB修改副本集配置

一、删除副本集成员

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) faile2015-02-02T22:21:22.797+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；