一旦mongod节点启动，我们将发出一个命令，以正确地初始化设置。几秒钟后，将选举产生一个主节点，你就可以开始写和查询集。

环境描述：

a.192.168.30.112:3306   主节点

b.192.168.30.113:3306   从节点

c.192.168.30.114:3306   从节点

[root@localhost ~]# tar zxvf mongodb-linux-x86_64-2.0.4.tgz

[root@localhost ~]# mv mongodb-linux-x86_64-2.0.4 /usr/local/mongodb

[root@localhost ~]# cd /usr/local/mongodb/

[root@localhost mongodb]# mkdir -p mongodb_data/mongodb_db

[root@localhost mongodb]# mkdir mongodb_data/mongodb_logs

以上3台服务器，一样的安装步骤

2.设置启动配置文件

[root@localhost mongodb]# vi /etc/mongodb.conf

fork = true

quiet = true

bind_ip = 192.168.30.112

port = 3306

dbpath = /usr/local/mongodb/mongodb_data/mongodb_db

logpath = /usr/local/mongodb/mongodb_data/mongodb_logs/server1.log

logappend = true

journal = true

rest = true

replSet = test

其余2台服务器，修改相应IP即可

3.启动mongodb

[root@localhost ~]# /usr/local/mongodb/bin/mongod -f /etc/mongodb.conf

4.初始化节点

我们连接到其中一个节点上，并使用replSetInitiate命令进行初始化。此命令需要一个配置对象，指定设定的每个成员的名字。

>/usr/local/mongodb/bin/mongo 192.168.30.112:3306/admin

>config ={_id:"test",members:[

...{_id:0,host:'192.168.30.112:3306',priority:4},

...{_id:1,host:'192.168.30.113:3306',priority:2},

...{_id:2,host:'192.168.30.114:3306',priority:1}]

...}

>rs.initiate(config);

{

"info":"Config now saved locally.  Should come online in about a minute.",

"ok":1

}

PRIMARY> rs.status()

{

"set" : "test",

"date" : ISODate("2013-12-31T07:49:39Z"),

"myState" : 1,

"members" : [

{

"_id" : 0,

"name" : "192.168.30.112:3306",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"optime" : {

"t" : 1388474768000,

"i" : 1

},

"optimeDate" : ISODate("2013-12-31T07:26:08Z"),

"self" : true

},

{

"_id" : 1,

"name" : "192.168.30.113:3306",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 790,

"optime" : {

"t" : 1388474768000,

"i" : 1

},

"optimeDate" : ISODate("2013-12-31T07:26:08Z"),

"lastHeartbeat" : ISODate("2013-12-31T07:49:38Z"),

"pingMs" : 0

},

{

"_id" : 2,

"name" : "192.168.30.114:3306",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 786,

"optime" : {

"t" : 1388474768000,

"i" : 1

},

"optimeDate" : ISODate("2013-12-31T07:26:08Z"),

"lastHeartbeat" : ISODate("2013-12-31T07:49:38Z"),

"pingMs" : 0

}

],

"ok" : 1

}