mongodb集群搭建

1、将安装包上传到服务器并解压

2、创建一个配置文件config.conf将配置写入

master（主）配置：

dbpath=/home/sczbbx/mongodb/data/master
logpath=/home/sczbbx/mongodb/data/log/master.log
pidfilepath=/home/sczbbx/mongodb/master.pid
directoryperdb=true
logappend=false
replSet=testrs
bind_ip=192.168.0.125
port=27017
oplogSize=10000
fork=true
noprealloc=true

slaver（从）配置：

dbpath=/home/sczbbx/mongodb/data/slaver  
logpath=/home/sczbbx/mongodb/data/log/slaver.log  
pidfilepath=/home/sczbbx/mongodb/slaver.pid  
directoryperdb=true  
logappend=true  
replSet=testrs  
#bind_ip=192.168.0.126
port=27017
oplogSize=10000  
fork=true  
noprealloc=true

arbiter（仲裁）配置：

dbpath=/home/sczbbx/mongodb/data/arbiter  
logpath=/home/sczbbx/mongodb/data/log/arbiter.log  
pidfilepath=/home/sczbbx/mongodb/arbiter.pid  
directoryperdb=true  
logappend=true  
replSet=testrs  
#bind_ip=192.168.0.127
port=27017  
oplogSize=10000  
fork=true  
noprealloc=true

配置参数说明：dbpath---数据储存位置，logpath--日志储存位置，pidfilepath---pid储存位置及名字，replSet---集群名字

3、使用命令启动

/home/sczbbx/mongodb/bin/mongod -f /home/sczbbx/mongodb/data/master/master.conf
/home/sczbbx/mongodb/bin/mongod -f /home/sczbbx/mongodb/data/slaver/slaver.conf
/home/sczbbx/mongodb/bin/mongod -f /home/sczbbx/mongodb/data/arbiter/arbiter.conf

4、在bin下运行./mongo 192.168.0.125:27017命令进入mongo里面

5、执行use admin 切换到admin角色，再执行下面的代码

config={_id:'testrs',members:[{_id :0,host:'192.168.0.125:27017',arbiterOnly:false,buildIndexes:true,hidden:false,priority:3,tags:{},slaveDelay:0,votes:1},
{_id:1,host:'192.168.0.126:27017',arbiterOnly:false,buildIndexes:true,hidden:false,priority: 1,tags: {},slaveDelay:0,votes:1},
{_id:2,host:'192.168.0.127:27017',arbiterOnly:true,buildIndexes:true,hidden: false,tags: {},slaveDelay: 0,votes: 1},],
"settings":{chainingAllowed:true,heartbeatTimeoutSecs:10,getLastErrorModes: {},getLastErrorDefaults: {w:1,wtimeout:0}}};

需要注意的是：_id必须要和配置中的replSet名字相同才行。

4、然后执行rs.initiate(config);

5、执行完成后可以通过rs.status();命令查看

{
        "set" : "testrs",
        "date" : ISODate("2018-09-12T07:38:16.640Z"),
        "myState" : 1,
        "term" : NumberLong(13),
        "heartbeatIntervalMillis" : NumberLong(2000),
        "members" : [
                {
                        "_id" : 0,
                        "name" : "192.168.0.125:27017",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "uptime" : 1043171,
                        "optime" : {
                                "ts" : Timestamp(1536737884, 1),
                                "t" : NumberLong(13)
                        },
                        "optimeDate" : ISODate("2018-09-12T07:38:04Z"),
                        "electionTime" : Timestamp(1535694736, 1),
                        "electionDate" : ISODate("2018-08-31T05:52:16Z"),
                        "configVersion" : 1,
                        "self" : true
                },
                {
                        "_id" : 1,
                        "name" : "192.168.0.126:27017",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "uptime" : 1041790,
                        "optime" : {
                                "ts" : Timestamp(1536737884, 1),
                                "t" : NumberLong(13)
                        },
                        "optimeDate" : ISODate("2018-09-12T07:38:04Z"),
                        "lastHeartbeat" : ISODate("2018-09-12T07:38:15.014Z"),
                        "lastHeartbeatRecv" : ISODate("2018-09-12T07:38:15.020Z"),
                        "pingMs" : NumberLong(0),
                        "syncingTo" : "192.168.0.125:27017",
                        "configVersion" : 1
                },
                {
                        "_id" : 2,
                        "name" : "192.168.0.127:27017",
                        "health" : 1,
                        "state" : 7,
                        "stateStr" : "ARBITER",
                        "uptime" : 1036300,
                        "lastHeartbeat" : ISODate("2018-09-12T07:38:14.999Z"),
                        "lastHeartbeatRecv" : ISODate("2018-09-12T07:38:15.011Z"),
                        "pingMs" : NumberLong(0),
                        "configVersion" : 1
                }
        ],
        "ok" : 1
}

这样显示就说明成功了