MongoDBのReplicaSetsの構築

Primary / Secondary / Arbiter の3台を構築

全3台の定義ファイルを変更

$ sudo vi /etc/mongodb.conf

## ReplicaSetsの名前をつける。のちの設定で使用。
==
replSet = log_rep
==

## 変更後サービスの再起動
$ sudo service mongodb restart

現状のステータス
以降、PrimaryのMongoにアクセスして設定を行う。

> rs.status()
{
        "startupStatus" : 3,
        "info" : "run rs.initiate(...) if not yet done for the set",
        "errmsg" : "can't get local.system.replset config from self or any seed (EMPTYCONFIG)",
        "ok" : 0
}

自分自身の定義

> config = {_id: 'log_rep', members: [{_id: 0, host: '10.20.30.191:27017'}]}  ★定義ファイルで指定した名前が_id部
{
        "_id" : "log_rep",
        "members" : [
                {
                        "_id" : 0,
                        "host" : "10.20.30.191:27017"
                }
        ]
}

初期化

> rs.initiate(config)
{
        "info" : "Config now saved locally.  Should come online in about a minute.",
        "ok" : 1
}
>

初期化完了

> rs.status()
{
        "set" : "log_rep",
        "date" : ISODate("2012-03-23T09:49:38Z"),
        "myState" : 1,
        "members" : [
                {
                        "_id" : 0,
                        "name" : "10.20.30.191:27017",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "optime" : {
                                "t" : 1332496142000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-03-23T09:49:02Z"),
                        "self" : true
                }
        ],
        "ok" : 1
}

SECONDARYの定義追加

PRIMARY> rs.add("10.20.30.192")
{ "ok" : 1 }

PRIMARY> rs.status()
{
        "set" : "log_rep",
        "date" : ISODate("2012-03-23T09:55:43Z"),
        "myState" : 1,
        "members" : [
                {
                        "_id" : 0,
                        "name" : "10.20.30.191:27017",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "optime" : {
                                "t" : 1332496301000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-03-23T09:51:41Z"),
                        "self" : true
                },
                {
                        "_id" : 1,
                        "name" : "10.20.30.192:27017",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",  ★無事SECONDARYになった！
                        "uptime" : 242,
                        "optime" : {
                                "t" : 1332496301000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-03-23T09:51:41Z"),
                        "lastHeartbeat" : ISODate("2012-03-23T09:55:41Z"),
                        "pingMs" : 0
                }
        ],
        "ok" : 1
}

Secondaryのほうは何もしなくて良い

SECONDARY> rs.status()
{
        "set" : "log_rep",
        "date" : ISODate("2012-03-23T10:01:54Z"),
        "myState" : 2,
        "syncingTo" : "10.20.30.191:27017",
        "members" : [
                {
                        "_id" : 0,
                        "name" : "10.20.30.191:27017",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "uptime" : 604,
                        "optime" : {
                                "t" : 1332496301000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-03-23T09:51:41Z"),
                        "lastHeartbeat" : ISODate("2012-03-23T10:01:53Z"),
                        "pingMs" : 1
                },
                {
                        "_id" : 1,
                        "name" : "10.20.30.192:27017",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "optime" : {
                                "t" : 1332496301000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-03-23T09:51:41Z"),
                        "self" : true
                }
        ],
        "ok" : 1
}

Arbiterの設定
Arbiterの設定もPrimaryで行う。
Secondary追加時同様、しばらく待つとできあがる

PRIMARY> rs.addArb("10.20.30.190:27017")

PRIMARY> rs.status()
{
        "set" : "log_rep",
        "date" : ISODate("2012-03-26T08:23:53Z"),
        "myState" : 1,
        "syncingTo" : "10.20.30.192:27017",
        "members" : [
                {
                        "_id" : 0,
                        "name" : "10.20.30.191:27017",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "optime" : {
                                "t" : 1332749742000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-03-26T08:15:42Z"),
                        "self" : true
                },
                {
                        "_id" : 1,
                        "name" : "10.20.30.192:27017",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "uptime" : 514,
                        "optime" : {
                                "t" : 1332749742000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-03-26T08:15:42Z"),
                        "lastHeartbeat" : ISODate("2012-03-26T08:23:53Z"),
                        "pingMs" : 1
                },
                {
                        "_id" : 2,
                        "name" : "10.20.30.190:27017",
                        "health" : 1,
                        "state" : 7,
                        "stateStr" : "ARBITER",  ★ Arbiterが追加されたことを確認
                        "uptime" : 390,
                        "optime" : {
                                "t" : 0,
                                "i" : 0
                        },
                        "optimeDate" : ISODate("1970-01-01T00:00:00Z"),
                        "lastHeartbeat" : ISODate("2012-03-26T08:23:53Z"),
                        "pingMs" : 1
                }
        ],
        "ok" : 1
}

Arbiterのほうでmongoに入るとARBITERになってるのが確認できる

ARBITER>