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mongodb 复制集

2015-12-08 09:58 344 查看

mongodb的复制集，大致就是在主从复制的基础上，加入了高可用控制，类似高可用mysql集群

在主节点出现问题后，从节点会重新找出来一个主节点，系统自动完成，mysql如果也这样就完美了，mysql弄这个好复杂

1.

在linux 下面做3个账号连接，然后依次开启3个mongodb的进程（非守护进行，守护进程只能开启一个）

2.

/usr/local/mongodb2.6/bin/mongod --dbpath=/mongodb/data1 -logpath=/mongodb/log1/log.log -port=10001  --replSet terry
/usr/local/mongodb2.6/bin/mongod --dbpath=/mongodb/data2 -logpath=/mongodb/log2/log.log -port=10002  --replSet terry
/usr/local/mongodb2.6/bin/mongod --dbpath=/mongodb/data3 -logpath=/mongodb/log3/log.log -port=10003  --replSet terry

查看是否运行成功：

[root@grande ~]# ps -ef | grep mongo
root      2345     1  0 Nov27 ?        01:34:52 /usr/local/mongodb2.6/bin/mongod --dbpath=/usr/local/mongodb2.6/data -logpath=/usr/local/mongodb2.6/log -fork -port=27017
root     25111 24779  0 09:13 pts/1    00:00:12 /usr/local/mongodb2.6/bin/mongod --dbpath=/mongodb/data2 -logpath=/mongodb/log2/log.log -port=10002 --replSet terry
root     25157 24679  0 09:13 pts/0    00:00:12 /usr/local/mongodb2.6/bin/mongod --dbpath=/mongodb/data1 -logpath=/mongodb/log1/log.log -port=10001 --replSet terry
root     25203 24809  0 09:14 pts/2    00:00:11 /usr/local/mongodb2.6/bin/mongod --dbpath=/mongodb/data3 -logpath=/mongodb/log3/log.log -port=10003 --replSet terry
root     25341 24854  0 09:17 pts/4    00:00:00 mongo 10.10.10.252:10001/admin
root     25895 25288  0 09:38 pts/5    00:00:00 mongo 10.10.10.252:10002
root     26089 26069  0 09:44 pts/6    00:00:00 grep mongo

3. 通过上面的运行，我们还需要初始化：

mongo 10.10.10.252:10001/admin

db.runCommand({"replSetInitiate":{
	"_id":"terry",
	"members":[
	{
		"_id":1,
		"host":"10.10.10.252:10001"

	},
	
	{
		"_id":2,
		"host":"10.10.10.252:10002"

	}

	]

	}
}
)

如果成功：显示

{
	"info" : "Config now saved locally.  Should come online in about a minute.",
	"ok" : 1
}

显示复制集状态：

rs.status()

> rs.status()
{
	"set" : "terry",
	"date" : ISODate("2015-12-08T01:17:08Z"),
	"myState" : 1,
	"members" : [
		{
			"_id" : 1,
			"name" : "10.10.10.252:10001",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 192,
			"optime" : Timestamp(1449537265, 1),
			"optimeDate" : ISODate("2015-12-08T01:14:25Z"),
			"electionTime" : Timestamp(1449537274, 1),
			"electionDate" : ISODate("2015-12-08T01:14:34Z"),
			"self" : true
		},
		{
			"_id" : 2,
			"name" : "10.10.10.252:10002",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 162,
			"optime" : Timestamp(1449537265, 1),
			"optimeDate" : ISODate("2015-12-08T01:14:25Z"),
			"lastHeartbeat" : ISODate("2015-12-08T01:17:06Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T01:17:06Z"),
			"pingMs" : 0,
			"syncingTo" : "10.10.10.252:10001"
		}
	],
	"ok" : 1
}

把10003添加到副本集： mongo 10.10.10.252:10001/admin （仲裁服务器）

rs.addArb("10.10.10.252:10003")

terry:PRIMARY> rs.addArb("10.10.10.252:10003")
{ "ok" : 1 }
terry:PRIMARY> rs.status
function () { return db._adminCommand("replSetGetStatus"); }
terry:PRIMARY> rs.status()
{
	"set" : "terry",
	"date" : ISODate("2015-12-08T01:18:29Z"),
	"myState" : 1,
	"members" : [
		{
			"_id" : 1,
			"name" : "10.10.10.252:10001",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 273,
			"optime" : Timestamp(1449537501, 1),
			"optimeDate" : ISODate("2015-12-08T01:18:21Z"),
			"electionTime" : Timestamp(1449537274, 1),
			"electionDate" : ISODate("2015-12-08T01:14:34Z"),
			"self" : true
		},
		{
			"_id" : 2,
			"name" : "10.10.10.252:10002",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 243,
			"optime" : Timestamp(1449537501, 1),
			"optimeDate" : ISODate("2015-12-08T01:18:21Z"),
			"lastHeartbeat" : ISODate("2015-12-08T01:18:28Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T01:18:28Z"),
			"pingMs" : 0,
			"syncingTo" : "10.10.10.252:10001"
		},
		{
			"_id" : 3,
			"name" : "10.10.10.252:10003",
			"health" : 1,
			"state" : 7,
			"stateStr" : "ARBITER",
			"uptime" : 8,
			"lastHeartbeat" : ISODate("2015-12-08T01:18:27Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T01:18:28Z"),
			"pingMs" : 0
		}
	],
	"ok" : 1
}

查看到3个进程的mongodb的复制集完成，如果添加其他的，还可以陆续添加

4. 执行查询会报错：

但此时在从库中查询报如下错误：

这是正常的现象，对于SECONDARY节点默认是不可读的。因为SECONDARY是不允许读和写的，在写多读少的应用中，使用Replica Sets来实现读写分离。通过在连接时指定或者在主库指定slaveOk，由SECONDARY来分担读的压力，PRIMARY只承担些操作。

解决方法：

第一种：在从节点设置slaveOk（）：

rs.slaveOk();

第二种：在主节点设置：

db.getMongo().setSlaveOk();

这样就可以查询了。

5. 增加新节点：

rs.add("10.10.10.252:10004");

6.删除新增节点：

terry:PRIMARY> rs.remove("10.10.10.252:10004");
2015-12-08T10:30:15.336+0800 DBClientCursor::init call() failed
2015-12-08T10:30:15.339+0800 Error: error doing query: failed at src/mongo/shell/query.js:81
2015-12-08T10:30:15.341+0800 trying reconnect to 10.10.10.252:10001 (10.10.10.252) failed
2015-12-08T10:30:15.341+0800 reconnect 10.10.10.252:10001 (10.10.10.252) ok

terry:PRIMARY> rs.status();
{
	"set" : "terry",
	"date" : ISODate("2015-12-08T02:30:37Z"),
	"myState" : 1,
	"members" : [
		{
			"_id" : 1,
			"name" : "10.10.10.252:10001",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 4601,
			"optime" : Timestamp(1449541815, 1),
			"optimeDate" : ISODate("2015-12-08T02:30:15Z"),
			"electionTime" : Timestamp(1449537274, 1),
			"electionDate" : ISODate("2015-12-08T01:14:34Z"),
			"self" : true
		},
		{
			"_id" : 2,
			"name" : "10.10.10.252:10002",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 22,
			"optime" : Timestamp(1449541815, 1),
			"optimeDate" : ISODate("2015-12-08T02:30:15Z"),
			"lastHeartbeat" : ISODate("2015-12-08T02:30:37Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T02:30:36Z"),
			"pingMs" : 0,
			"lastHeartbeatMessage" : "syncing to: 10.10.10.252:10001",
			"syncingTo" : "10.10.10.252:10001"
		},
		{
			"_id" : 3,
			"name" : "10.10.10.252:10003",
			"health" : 1,
			"state" : 7,
			"stateStr" : "ARBITER",
			"uptime" : 22,
			"lastHeartbeat" : ISODate("2015-12-08T02:30:37Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T02:30:36Z"),
			"pingMs" : 0
		}
	],
	"ok" : 1
}

7.测试切换

主节点停掉：

terry:PRIMARY> rs.status();
{
	"set" : "terry",
	"date" : ISODate("2015-12-08T03:03:14Z"),
	"myState" : 1,
	"members" : [
		{
			"_id" : 1,
			"name" : "10.10.10.252:10001",
			"health" : 0,
			"state" : 8,
			"stateStr" : "(not reachable/healthy)",
			"uptime" : 0,
			"optime" : Timestamp(1449541815, 1),
			"optimeDate" : ISODate("2015-12-08T02:30:15Z"),
			"lastHeartbeat" : ISODate("2015-12-08T03:03:13Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T02:32:45Z"),
			"pingMs" : 0
		},
		{
			"_id" : 2,
			"name" : "10.10.10.252:10002",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 6565,
			"optime" : Timestamp(1449543736, 1),
			"optimeDate" : ISODate("2015-12-08T03:02:16Z"),
			"electionTime" : Timestamp(1449541974, 1),
			"electionDate" : ISODate("2015-12-08T02:32:54Z"),
			"self" : true
		},
		{
			"_id" : 3,
			"name" : "10.10.10.252:10003",
			"health" : 1,
			"state" : 7,
			"stateStr" : "ARBITER",
			"uptime" : 1979,
			"lastHeartbeat" : ISODate("2015-12-08T03:03:12Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T03:03:13Z"),
			"pingMs" : 0
		},
		{
			"_id" : 4,
			"name" : "10.10.10.252:10004",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 58,
			"optime" : Timestamp(1449543736, 1),
			"optimeDate" : ISODate("2015-12-08T03:02:16Z"),
			"lastHeartbeat" : ISODate("2015-12-08T03:03:12Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T03:03:12Z"),
			"pingMs" : 0,
			"lastHeartbeatMessage" : "syncing to: 10.10.10.252:10002",
			"syncingTo" : "10.10.10.252:10002"
		}
	],
	"ok" : 1
}

可以看到 id为1的状态为"stateStr" : "(not reachable/healthy)",

id为2的变为PRIMARY

在yii2下链接是没有问题的

关于副本集的yii2的配置参看：
http://blog.csdn.net/terry_water/article/details/50215887
重新启动id为1的mongo：

terry:PRIMARY> rs.status();
{
	"set" : "terry",
	"date" : ISODate("2015-12-08T03:06:09Z"),
	"myState" : 1,
	"members" : [
		{
			"_id" : 1,
			"name" : "10.10.10.252:10001",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 4,
			"optime" : Timestamp(1449541815, 1),
			"optimeDate" : ISODate("2015-12-08T02:30:15Z"),
			"lastHeartbeat" : ISODate("2015-12-08T03:06:07Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T03:06:08Z"),
			"pingMs" : 52
		},
		{
			"_id" : 2,
			"name" : "10.10.10.252:10002",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 6740,
			"optime" : Timestamp(1449543736, 1),
			"optimeDate" : ISODate("2015-12-08T03:02:16Z"),
			"electionTime" : Timestamp(1449541974, 1),
			"electionDate" : ISODate("2015-12-08T02:32:54Z"),
			"self" : true
		},
		{
			"_id" : 3,
			"name" : "10.10.10.252:10003",
			"health" : 1,
			"state" : 7,
			"stateStr" : "ARBITER",
			"uptime" : 2154,
			"lastHeartbeat" : ISODate("2015-12-08T03:06:08Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T03:06:09Z"),
			"pingMs" : 0
		},
		{
			"_id" : 4,
			"name" : "10.10.10.252:10004",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 233,
			"optime" : Timestamp(1449543736, 1),
			"optimeDate" : ISODate("2015-12-08T03:02:16Z"),
			"lastHeartbeat" : ISODate("2015-12-08T03:06:08Z"),
			"lastHeartbeatRecv" : ISODate("2015-12-08T03:06:08Z"),
			"pingMs" : 0,
			"syncingTo" : "10.10.10.252:10002"
		}
	],
	"ok" : 1
}

可以看到启动成功了

副本集是强大！！！！配置如此简单。

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