mongodb 复制集

转自（林夕木大大 http://www.cnblogs.com/MDK-L/p/4475959.html）
一，节点类型:

a) 主节点:支持读写

b) 从节点：支持读(需设置)

二, 节点环境

主节点:192.168.129.47

mongodb安装目录:/home/en/tool/mongodb-linux-x86_64-2.6.9/

mongodb数据目录:/home/en/njqgd_db

mongodb日志目录:/home/en/njqgd_log

mongodb密匙目录:/home/en/njqgd_key

node.js 程序目录:/home/en/njqgd_node

java 　程序目录:/home/en/njqgd_tomcat/apache-tomcat-7.0.61

从节点:192.168.129.48

mongodb安装目录:/home/en/tool/mongodb-linux-x86_64-2.6.9/

mongodb数据目录:/njqgd_db/db

mongodb日志目录:/njqgd_db/log

mongodb密匙目录:/njqgd_db/key

清空从节点数据目录:rm -rf /njqgd_db/db/* (请确保从节点目录为空,若不为空执行此命令)

1.主节点操作:

1) cd /home/en/tool/mongodb-linux-x86_64-2.6.9/bin
2) sudo echo "njqgd db 1" > /home/en/njqgd_key/key
3) sudo chmod 600 /home/en/njqgd_key/key
4) sudo ./mongod --dbpath=/home/en/njqgd_db/ --logpath=/home/en/njqgd_log/mongodb.log --port 27017  --replSet njqgd --keyFile /home/en/njqgd_key/key --maxConns=2000 --fork –logappend (此操作需等待约半分钟)

出现如下内容,说明第4步操作成功:
about to fork child process, waiting until server is ready for connections.
forked process: XXXX
child process started successfully, parent exiting

5) 现在开始进行从节点操作,从节点操作完毕,再进行下一步.
6) cd /home/en/tool/mongodb-linux-x86_64-2.6.9/bin
7) sudo ./mongo
8) use admin
9) db.runCommand({"replSetInitiate" : {"_id" : "njqgd","members" : [{"_id" : 0,"host" : "192.168.129.47:27017"},{"_id" : 1,"host" : "192.168.129.48 :27017"}]}});
出现如下内容,说明第9步操作成功:
{
"info" : "Config now saved locally.  Should come online in about a minute.",
"ok" : 1
}
10) 所有操作完毕.

2.从节点操作:

1) cd /home/en/tool/mongodb-linux-x86_64-2.6.9/bin
2) sudo echo "njqgd db 1" > /njqgd_db/key/key (此处 echo 命令后面 双引号内的内容请和主节点保持一致)
3) sudo chmod 600 /njqgd_db/key/key
4) sudo ./mongod --dbpath=/njqgd_db/db/ --logpath=/njqgd_db/log/mongodb.log --port 27017  --replSet njqgd/192.168.129.47:27017 --keyFile /njqgd_db/key/key --maxConns=2000 --fork –logappend

出现如下内容,说明第4步操作成功:
about to fork child process, waiting until server is ready for connections.
forked process: XXXX
child process started successfully, parent exiting

5) 从节点操作完成,请继续主节点操作第6步.

3. 添加数据库操作用户

1) cd /home/en/tool/mongodb-linux-x86_64-2.6.9/bin
2) sudo ./mongo
3) use admin
4) db.addUser('njqgd','njqgd');
5) use wqdwxt_njqgd
6) db.addUser('njqgd','njqgd');
7) db.test.insert({'name':'test'})

4. 节点主从状态切换

cfg = rs.conf()
cfg.members[0].priority = 2
cfg.members[1].priority = 1
cfg.members[2].priority = 0.5
rs.reconfig(cfg)

节点的 priority 值越大,切换时的优先级越高.设置好从节点的 priority 值后,调用一次 rs.reconfig 操作会导致当前主库中断,因为

需要重新执行主节点竞选,大概几十秒后,新的主节点产生#查看复制集状态.

rs.status()

rs.isMaster()

rs.conf()

#查看从库状态

db.printSlaveReplicationInfo()

#设置从库可查询

db.getMongo().setSlaveOk()

rs.setSlaveOk()

三. 开启各项服务.

1.开启mongodb

1) sudo -s (输入密码)
2) cd /home/en/tool/mongodb-linux-x86_64-2.6.9/bin
3) ./mongod --dbpath=/home/en/njqgd_db/ --logpath=/home/en/njqgd_log/mongodb.log --port 27017  --replSet njqgd --keyFile /home/en/njqgd_key/key --maxConns=2000 --fork –logappend

出现如下类似内容说明成功
about to fork child process, waiting until server is ready for connections.
forked process: XXXX
child process started successfully, parent exiting

1.1 mongodb手动切换主从

1) sudo -s (输入密码)
2) cd /home/en/tool/mongodb-linux-x86_64-2.6.9/bin
3) ./mongo
4) rs.isMaster();
如果出现如下内容
{
"setName" : "njqgd",
"setVersion" : 2,
"ismaster" : true,
"secondary" : false,
"hosts" : [
"192.168.129.47:27017",
"192.168.129.48 :27017"
],
"primary" : "192.168.129.47:27017",
"me" : "192.168.129.48:27017",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2015-05-09T02:20:08.633Z"),
"maxWireVersion" : 2,
"minWireVersion" : 0,
"ok" : 1
}
ismaster为true 当前节点即为主节点(就不用进行下面的操作)

5) use admin
6) db.auth('njqgd','njqgd');
7) rs.status();
{
"set" : "njqgd",
"date" : ISODate("2015-05-09T02:28:35Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "192.168.129.47:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 54073,
"optime" : Timestamp(1431138513, 2),
"optimeDate" : ISODate("2015-05-09T02:28:33Z"),
"electionTime" : Timestamp(1431084460, 1),
"electionDate" : ISODate("2015-05-08T11:27:40Z"),
"self" : true
},
{
"_id" : 1,
"name" : "192.168.129.48:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 54059,
"optime" : Timestamp(1431138512, 3),
"optimeDate" : ISODate("2015-05-09T02:28:32Z"),
"lastHeartbeat" : ISODate("2015-05-09T02:28:33Z"),
"lastHeartbeatRecv" : ISODate("2015-05-09T02:28:33Z"),
"pingMs" : 1,
"syncingTo" : "222.186.43.150:27017"
}
],
"ok" : 1
}
要记住 节点顺序 以便下一步操作
6) cfg = rs.conf() <回车>
cfg.members[0].priority = 2 <回车> (此处中括号中是节点顺序.从0开始)
cfg.members[1].priority = 1 <回车>
rs.reconfig(cfg) <回车>
节点的 priority 值越大,切换时的优先级越高.设置好从节点的 priority 值后,调用一次 rs.reconfig 操作会导致当前主库中断,因为

需要重新执行主节点竞选,大概几十秒后,新的主节点产生#查看复制集状态.