Mongo副本集搭建

解压mongodb-linux-x86_64-rhel70-3.2.0.tgz

将解压后的bin路径添加到系统环境变量，保证mongo、mongod等命令可用

创建副本集目录mongo/27017、27018、27019

27017、27018、27019下在创建mogo.conf：

logpath=/data/local/mongo/27017/log/mongo.log

dbpath=/data/local/mongo/27017/data

bind_ip=127.0.0.1   #若允许外网访问，需删掉此项

logappend=true

fork=true

port=27017

创建配置文件中logpath和dbpath目录。

启动服务

mongod --config 27017/mongo.conf --replSet set1 

mongod --config 27018/mongo.conf --replSet set1 

mongod --config 27019/mongo.conf --replSet set1 

配置副本集:

连接27017

mongo --port 27017

定义变量:

>conf = {_id:"set1",members:[{_id:0,host:"127.0.0.1:27017"}]}

rs.initiate(conf)

显示：

<"ok":1>

将本实例设置成master:

>db.isMaster() 

将27018、27019添加到副本集:

>rs.add("127.0.0.1:27018")
>rs.add("127.0.0.1:27019")

登录任一台查看副本集状态:

set1:PRIMARY> rs.status()
{
    "set" : "set1",
    "date" : ISODate("2017-04-22T06:20:43.260Z"),
    "myState" : 1,
    "term" : NumberLong(1),
    "heartbeatIntervalMillis" : NumberLong(2000),
    "members" : [
        {
            "_id" : 0,
            "name" : "127.0.0.1:27017",
            "health" : 1,
            "state" : 1,
            "stateStr" : "PRIMARY",
            "uptime" : 321,
            "optime" : {
                "ts" : Timestamp(1492842009, 1),
                "t" : NumberLong(1)
            },
            "optimeDate" : ISODate("2017-04-22T06:20:09Z"),
            "electionTime" : Timestamp(1492841919, 2),
            "electionDate" : ISODate("2017-04-22T06:18:39Z"),
            "configVersion" : 3,
            "self" : true
        },
        {
            "_id" : 1,
            "name" : "127.0.0.1:27018",
            "health" : 1,
            "state" : 2,
            "stateStr" : "SECONDARY",
            "uptime" : 37,
            "optime" : {
                "ts" : Timestamp(1492842009, 1),
                "t" : NumberLong(1)
            },
            "optimeDate" : ISODate("2017-04-22T06:20:09Z"),
            "lastHeartbeat" : ISODate("2017-04-22T06:20:43.216Z"),
            "lastHeartbeatRecv" : ISODate("2017-04-22T06:20:42.216Z"),
            "pingMs" : NumberLong(0),
            "syncingTo" : "127.0.0.1:27017",
            "configVersion" : 3
        },
        {
            "_id" : 2,
            "name" : "127.0.0.1:27019",
            "health" : 1,
            "state" : 2,
            "stateStr" : "SECONDARY",
            "uptime" : 34,
            "optime" : {
                "ts" : Timestamp(1492842009, 1),
                "t" : NumberLong(1)
            },
            "optimeDate" : ISODate("2017-04-22T06:20:09Z"),
            "lastHeartbeat" : ISODate("2017-04-22T06:20:43.221Z"),
            "lastHeartbeatRecv" : ISODate("2017-04-22T06:20:41.228Z"),
            "pingMs" : NumberLong(0),
            "configVersion" : 3
        }
    ],
    "ok" : 1
}

修改默认数据引擎:

mongo3.2默认引擎为WiredTiger，若需要使用其他引擎，可在启动时指定:

mongod --storageEngine mmapv1 --config mongo.conf --replSet set1

强制kill掉mongo，再启动时会报错:

ERROR: child process failed, exited with error number 100

需先修复:

 mongod -f mongo.conf --repair

然后再启动