一、环境
$ cat /etc/redhat-release CentOS Linux release 7.0.1406 (Core) $ uname -aLinux zhaopin-2-201 3.10.0-123.el7.x86_64 #1 SMP Mon Jun 30 12:09:22 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux$ mongo --versionMongoDB shell version: 3.0.6
二、准备
1.创建目录
$ sudo mkdir -p /data/mongodb/{data/db0,backup/db0,log/db0,conf/db0} 2.编写配置文件
$ sudo vim /data/mongodb/conf/db0/mongodb.conf# baseport = 27017maxConns = 800 filePermissions = 0700fork = truenoauth = truedirectoryperdb = truedbpath = /data/mongodb/data/db0pidfilepath = /data/mongodb/data/db0/mongodb.pidjournal = true# securitynohttpinterface = truerest = false# log logpath = /data/mongodb/log/db0/mongodb.loglogRotate = renamelogappend = trueslowms = 50replSet = rs0
三、配置副本集
1.配置primary
1）启动
$ sudo /opt/mongodb/bin/mongod --config /data/mongodb/conf/db0/mongodb.conf about to fork child process, waiting until server is ready for connections.forked process: 48583child process started successfully, parent exiting$ mongoMongoDB shell version: 3.0.6connecting to: test> rs.status();{ "info" : "run rs.initiate(...) if not yet done for the set", "ok" : 0, "errmsg" : "no replset config has been received", "code" : 94} 2）初始化
> cfg={_id:"rs0", members:[ {_id:0,host:"172.30.2.201:27017"}] }{ "_id" : "rs0", "members" : [ { "_id" : 0, "host" : "172.30.2.201:27017" } ]}> rs.initiate( cfg );{ "ok" : 1 }rs0:OTHER> rs.status();{ "set" : "rs0", "date" : ISODate("2015-09-25T08:31:36.354Z"), "myState" : 1, "members" : [ { "_id" : 0, "name" : "172.30.2.201:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 112, "optime" : Timestamp(1443169891, 1), "optimeDate" : ISODate("2015-09-25T08:31:31Z"), "electionTime" : Timestamp(1443169891, 2), "electionDate" : ISODate("2015-09-25T08:31:31Z"), "configVersion" : 1, "self" : true } ], "ok" : 1} 2.添加节点
1）启动新的节点
$ sudo /opt/mongodb/bin/mongod --config /data/mongodb/conf/db0/mongodb.confabout to fork child process, waiting until server is ready for connections.forked process: 41794child process started successfully, parent exiting$ sudo /opt/mongodb/bin/mongod --config /data/mongodb/conf/db0/mongodb.confabout to fork child process, waiting until server is ready for connections.forked process: 3761child process started successfully, parent exiting
2）添加新的节点
在primary上执行：
rs0:PRIMARY> rs.add( "172.30.2.202:27017" );{ "ok" : 1 }rs0:PRIMARY> rs.status();{ "set" : "rs0", "date" : ISODate("2015-09-25T08:34:48.161Z"), "myState" : 1, "members" : [ { "_id" : 0, "name" : "172.30.2.201:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 304, "optime" : Timestamp(1443170060, 1), "optimeDate" : ISODate("2015-09-25T08:34:20Z"), "electionTime" : Timestamp(1443169891, 2), "electionDate" : ISODate("2015-09-25T08:31:31Z"), "configVersion" : 2, "self" : true }, { "_id" : 1, "name" : "172.30.2.202:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 27, "optime" : Timestamp(1443170060, 1), "optimeDate" : ISODate("2015-09-25T08:34:20Z"), "lastHeartbeat" : ISODate("2015-09-25T08:34:46.884Z"), "lastHeartbeatRecv" : ISODate("2015-09-25T08:34:46.896Z"), "pingMs" : 0, "configVersion" : 2 } ], "ok" : 1}rs0:PRIMARY> rs.add( "172.30.2.203:27017" );{ "ok" : 1 }rs0:PRIMARY> rs.status();{ "set" : "rs0", "date" : ISODate("2015-09-25T08:36:22.579Z"), "myState" : 1, "members" : [ { "_id" : 0, "name" : "172.30.2.201:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 398, "optime" : Timestamp(1443170158, 1), "optimeDate" : ISODate("2015-09-25T08:35:58Z"), "electionTime" : Timestamp(1443169891, 2), "electionDate" : ISODate("2015-09-25T08:31:31Z"), "configVersion" : 3, "self" : true }, { "_id" : 1, "name" : "172.30.2.202:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 121, "optime" : Timestamp(1443170158, 1), "optimeDate" : ISODate("2015-09-25T08:35:58Z"), "lastHeartbeat" : ISODate("2015-09-25T08:36:22.268Z"), "lastHeartbeatRecv" : ISODate("2015-09-25T08:36:20.949Z"), "pingMs" : 0, "syncingTo" : "172.30.2.201:27017", "configVersion" : 3 }, { "_id" : 2, "name" : "172.30.2.203:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 24, "optime" : Timestamp(1443170158, 1), "optimeDate" : ISODate("2015-09-25T08:35:58Z"), "lastHeartbeat" : ISODate("2015-09-25T08:36:22.267Z"), "lastHeartbeatRecv" : ISODate("2015-09-25T08:36:22.275Z"), "pingMs" : 0, "configVersion" : 3 } ], "ok" : 1} 3. 设置开机启动
$ sudo vim /etc/rc.local/opt/mongodb/bin/mongod --config /data/mongodb/conf/db0/mongodb.conf
四、验证
1.数据同步
1) primary：
$ mongoMongoDB shell version: 3.0.6connecting to: testrs0:PRIMARY> use aaa;switched to db aaars0:PRIMARY> db.createCollection( "test" );{ "ok" : 1 }rs0:PRIMARY> show collections;system.indexestest 2) secondary：
$ mongoMongoDB shell version: 3.0.6connecting to: testrs0:SECONDARY> rs.slaveOk();rs0:SECONDARY> use aaa;switched to db aaars0:SECONDARY> show collections;system.indexestest$ mongoMongoDB shell version: 3.0.6connecting to: testrs0:SECONDARY> rs.slaveOk();rs0:SECONDARY> use aaa;switched to db aaars0:SECONDARY> show collections;system.indexestest
2.读写验证
由上可知，primary是可读写的
在secondary上写测试：
$ mongoMongoDB shell version: 3.0.6connecting to: test> use aaa;switched to db aaa> db.createCollection("test2");{ "note" : "from execCommand", "ok" : 0, "errmsg" : "not master" }> show collections;2015-09-23T15:57:49.240+0800 E QUERY Error: listCollections failed: { "note" : "from execCommand", "ok" : 0, "errmsg" : "not master" } at Error ( ) at DB._getCollectionInfosCommand (src/mongo/shell/db.js:646:15) at DB.getCollectionInfos (src/mongo/shell/db.js:658:20) at DB.getCollectionNames (src/mongo/shell/db.js:669:17) at shellHelper.show (src/mongo/shell/utils.js:625:12) at shellHelper (src/mongo/shell/utils.js:524:36) at (shellhelp2):1:1 at src/mongo/shell/db.js:646> rs.slaveOk();> show collections;system.indexestest> 证明secondary节点是不能写，默认也是不可读的，需要执行rs.slaveOk();或者db.getMongo().setSlaveOk();并且只对当前session有效，所以每次连接从库都需要执行。
五、说明
mongodb的副本集至少需要3台以上才能实现高可用，并且节点的个数最好是基数。