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MongoDBReplica-set设置

时间:2021-07-01 10:21:17 帮助过:8人阅读

MongoDB Replica-set设置 本文用三个MongoDB server来架设replica-set。 首先分别准备三个UBuntu vm, 里面安装了MongoDB instance. 然后每个vm的/etc/hosts里面都包含了另外两个vm的ip和主机名。 这样确保每个vm都能通过主机名连接到其他两个vm. 我的vm分别

MongoDB Replica-set设置

本文用三个MongoDB server来架设replica-set。

首先分别准备三个UBuntu vm, 里面安装了MongoDB instance.

然后每个vm的/etc/hosts里面都包含了另外两个vm的ip和主机名。

这样确保每个vm都能通过主机名连接到其他两个vm.

我的vm分别是:vm1, vm3, vm4. IP分别是192.168.1.51, 192.168.1.52和192.168.1.53

依次登录所有的vm,然后编辑/etc/mongodb.conf文件,取消注释,并设置replSet

[plain]

replSet = rs1 // 必须设置为一个名字,千万别不同

添加

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fork=true

重新启动mongodb

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service mongodb restart

运行下面的命令:

登录到vm3,登录到mongodb, 然后执行rs.initiate创建一个replicaset,并用config检查配置。

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> rs.initiate()

{

"info2" : "no configuration explicitly specified -- making one",

"me" : "vm3:27017",

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

"ok" : 1

}

> rs.config()

{

"_id" : "rs1",

"version" : 1,

"members" : [

{

"_id" : 0,

"host" : "vm3:27017"

}

]

}

注意,3个vm中只能选中一个运行rs.initiate命令,如果在其他的vm中不小心也运行了。需要用下面的方法清除之:

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use local

db.dropDatabase()

exit

service mongodb restart

然后在vm3的mongodb上继续执行rs.add命令:

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root@vm3:~# mongo

MongoDB shell version: 2.4.3

connecting to: test

rs1:PRIMARY> rs.add("vm1")

{

"errmsg" : "exception: set name does not match the set name host vm1:27017 expects",

"code" : 13145,

"ok" : 0

}

rs1:PRIMARY> rs.add("vm4")

{

"errmsg" : "exception: set name does not match the set name host vm4:27017 expects",

"code" : 13145,

"ok" : 0

}

报错的原因很奇怪。查了半天,难道是刚才修改了/etc/hosts没有重新启动的原因么?

把三个vm都重新启动,再试!

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root@vm3:~# mongo

MongoDB shell version: 2.4.3

connecting to: test

rs1:PRIMARY> rs.add("vm4")

{ "ok" : 1 }

rs1:PRIMARY> rs.add("vm1")

{ "ok" : 1 }

成功了。不容易啊!再看一下配置:

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rs1:PRIMARY> rs.config()

{

"_id" : "rs1",

"version" : 3,

"members" : [

{

"_id" : 0,

"host" : "vm3:27017"

},

{

"_id" : 1,

"host" : "vm4:27017"

},

{

"_id" : 2,

"host" : "vm1:27017"

}

]

}

来看看状态:

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s1:PRIMARY> rs.status()

{

"set" : "rs1",

"date" : ISODate("2013-05-04T12:36:28Z"),

"myState" : 1,

"members" : [

{

"_id" : 0,

"name" : "vm3:27017",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 380,

"optime" : {

"t" : 1367670744,

"i" : 1

},

"optimeDate" : ISODate("2013-05-04T12:32:24Z"),

"self" : true

},

{

"_id" : 1,

"name" : "vm4:27017",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 248,

"optime" : {

"t" : 1367670744,

"i" : 1

},

"optimeDate" : ISODate("2013-05-04T12:32:24Z"),

"lastHeartbeat" : ISODate("2013-05-04T12:36:28Z"),

"lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),

"pingMs" : 0,

"syncingTo" : "vm3:27017"

},

{

"_id" : 2,

"name" : "vm1:27017",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 244,

"optime" : {

"t" : 1367670744,

"i" : 1

},

"optimeDate" : ISODate("2013-05-04T12:32:24Z"),

"lastHeartbeat" : ISODate("2013-05-04T12:36:26Z"),

"lastHeartbeatRecv" : ISODate("2013-05-04T12:36:28Z"),

"pingMs" : 1,

"syncingTo" : "vm3:27017"

}

],

"ok" : 1

}

vm3已经被选举为primary了。

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