为什么需要集群
- 为了让数据安全
- 高（24* 7）数据可用性
- 灾难恢复
- 无停机维护（如备份，索引重建，压实）
- 读缩放（额外的副本读取）
- 副本集对应用程序是透明
设置集群
准备工作
在MongoDB的集群是需要奇数个节点才能正常的运行，我们这里设置一个最小的节点的集群：1个主节点和2个从节点
-
分别建立三个文件夹来存放MongoDB的三个节点的文件
-
设置mongod.cfg文件
systemLog:
destination: file
path: D:\Program Files\MongoDB\Server\3.0\0\log\mongod.log
storage:
dbPath: D:\Program Files\MongoDB\Server\3.0\0\blogDB
#网络
net:
port: 27017
# bindIp: 127.0.0.1,192.168.1.106 #默认是全部IP
#授权
security:
authorization: disabled
# keyFile: D:\Program Files\MongoDB\Server\3.0\rsKey #用于集群的验证，建议使用ssl，我为了简单，rsKey只是一个普通的文本
#集群
replication:
replSetName: rs0 #集群名
三个节点的配置除了端口和路径需要改改，其他基本一致，我的三个节点的端口分别为：27017,27018,27019
启动集群
分别启动三个MongoDB实例，具体怎么启动，请参考我的MongoDB——基础入门
配置集群
C:\Users\Tengit>mongo
MongoDB shell version: 3.0.6
connecting to: test
> rs.initiate()
{
"info2" : "no configuration explicitly specified -- making one",
"me" : "tengit-2:27017",
"ok" : 1
}
rs0:PRIMARY> rs.add("tengit-2:27018")
{ "ok" : 1 }
rs0:PRIMARY> rs.add("tengit-2:27019")
{ "ok" : 1 }
rs0:PRIMARY> rs.status()
{
"set" : "rs0",
"date" : ISODate("2015-10-14T02:51:00.788Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "tengit-2:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 122,
"optime" : Timestamp(1444791053, 1),
"optimeDate" : ISODate("2015-10-14T02:50:53Z"),
"electionTime" : Timestamp(1444790978, 2),
"electionDate" : ISODate("2015-10-14T02:49:38Z"),
"configVersion" : 3,
"self" : true
},
{
"_id" : 1,
"name" : "tengit-2:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 32,
"optime" : Timestamp(1444791053, 1),
"optimeDate" : ISODate("2015-10-14T02:50:53Z"),
"lastHeartbeat" : ISODate("2015-10-14T02:50:59.873Z"),
"lastHeartbeatRecv" : ISODate("2015-10-14T02:51:00.118Z"
),
"pingMs" : 0,
"syncingTo" : "tengit-2:27017",
"configVersion" : 3
},
{
"_id" : 2,
"name" : "tengit-2:27019",
"health" : 1,
"state" : 5,
"stateStr" : "STARTUP2",
"uptime" : 6,
"optime" : Timestamp(0, 0),
"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" : ISODate("2015-10-14T02:50:59.871Z"),
"lastHeartbeatRecv" : ISODate("2015-10-14T02:51:00.138Z"
),
"pingMs" : 0,
"configVersion" : 3
}
],
"ok" : 1
}
rs0:PRIMARY> rs.status()
{
"set" : "rs0",
"date" : ISODate("2015-10-14T02:51:50.492Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "tengit-2:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 172,
"optime" : Timestamp(1444791053, 1),
"optimeDate" : ISODate("2015-10-14T02:50:53Z"),
"electionTime" : Timestamp(1444790978, 2),
"electionDate" : ISODate("2015-10-14T02:49:38Z"),
"configVersion" : 3,
"self" : true
},
{
"_id" : 1,
"name" : "tengit-2:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 82,
"optime" : Timestamp(1444791053, 1),
"optimeDate" : ISODate("2015-10-14T02:50:53Z"),
"lastHeartbeat" : ISODate("2015-10-14T02:51:49.886Z"),
"lastHeartbeatRecv" : ISODate("2015-10-14T02:51:50.125Z"
),
"pingMs" : 0,
"syncingTo" : "tengit-2:27017",
"configVersion" : 3
},
{
"_id" : 2,
"name" : "tengit-2:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 56,
"optime" : Timestamp(1444791053, 1),
"optimeDate" : ISODate("2015-10-14T02:50:53Z"),
"lastHeartbeat" : ISODate("2015-10-14T02:51:49.886Z"),
"lastHeartbeatRecv" : ISODate("2015-10-14T02:51:50.150Z"
),
"pingMs" : 0,
"configVersion" : 3
}
],
"ok" : 1
}
rs0:PRIMARY>
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