MongoDB主从复制

在生产环境中单台数据库已不能满足业务需求，数据库主从复制在架构中使用很常见，用于备份、高可用、读写分离来提高数据处理性能和冗余，常用架构模式是一主一从

[root@localhost ~]# mkdir /usr/local/mongodb/data[root@localhost ~]# mkdir /usr/local/mongodb/logs[root@localhost ~]# mkdir /usr/local/mongodb/conf[root@localhost ~]# vi /usr/local/mongodb/conf/mongod.confport=27017#端口号fork=true#以守护进程方式运行logpath=/usr/local/mongodb/logs/mongodb.log #日志文件logappend=true #日志输出方式dbpath=/usr/local/mongodb/data #数据库位置maxConns=1024 #数据库最大连接数master=true#主模式oplogSize=2048 #日志滚动，单位M

2、从Mongodb配置

[root@localhost ~]# mkdir /usr/local/mongodb/data[root@localhost ~]# mkdir /usr/local/mongodb/logs[root@localhost ~]# mkdir /usr/local/mongodb/conf[root@localhost ~]# vi /usr/local/mongodb/conf/mongod.confport=27017fork=truelogpath=/usr/local/mongodb/logs/mongodb.loglogappend=truedbpath=/usr/local/mongodb/datamaxConns=1024slave=true#从模式source=192.168.0.201:27017 #指定主Mongodbautoresync=true#自动同步

3、添加环境变量并启动Mongodb

[root@localhost ~]# echo “PATH=$PATH:/usr/local/mongodb/bin” >> /etc/profile[root@localhost ~]# source /etc/profile[root@localhost ~]# mongod -f /usr/local/mongodb/conf/mongod.conf #启动[root@localhost ~]# netstat -tupln | grep mongodtcp0 0 0.0.0.0:28017 0.0.0.0:*LISTEN1923/mongod tcp0 0 0.0.0.0:27017 0.0.0.0:*LISTEN1923/mongod[root@localhost ~]# mongoMongoDB shell version:2.4.9-rc0> use test> db.test.save({AGE:18})> db.test.find(){ “_id” :ObjectId(“52addd66124c02eb8b2d1a5a”), “AGE” : 18 }> show dbslocal 2.0771484375GBtest 0.203125GB>

主日志

从日志

创建数据库后，由上主从日志看出，主允许从连接，从同步主数据（appl来&源gao@dai!ma.com搞$代^码%网ied 1 operations）。主数据库操作记录为OpLog日志，，说明主从数据库原理是定期从主服务器中获取oplog记录，然后在本机上执行。

5、查看主从复制状态

#查看主

[root@localhost ~]# mongoMongoDB shell version:2.4.9-rc0connecting to: test>db.printReplicationInfo()configured oplog size: 2048MBlog length start to end:1494secs (0.42hrs)oplog first event time: Sun Dec 15 2013 10:55:37 GMT-0500 (EST)oplog last event time: Sun Dec 15 2013 11:20:31 GMT-0500 (EST)now:Sun Dec 15 2013 11:20:33GMT-0500 (EST)>

#查看从

[root@localhost ~]# mongoMongoDB shell version: 2.4.9-rc0connecting to: test>db.printReplicationInfo()this is a slave, printingslave replication info.source: 192.168.0.201:27017syncedTo: Sun Dec 15 2013 11:18:31GMT-0500 (EST)= 21 secs ago (0.01hrs)>

#关闭Mongodb数据库

[root@localhost ~]# mongod -f/usr/local/mongodb/conf/mongod.conf –shutdown

#写一个简单的SysV管理脚本

[root@localhost ~]# vim /etc/init.d/mongod#!/bin/bash#chkconfig: 35 80 20#description: Mongodb service control scriptPROG=”/usr/local/mongodb/bin/mongod”CONF=”/usr/local/mongodb/conf/mongod.conf”case $1 instart)$PROG -f $CONF &> /dev/nullecho “Starting mongodb:[ OK ]”;;stop)$PROG -f $CONF –shutdown &> /dev/nullecho “Shutting down mongodb:[ OK ]”;;restart)$0 stop$0 start;;*)echo “Usage: $0 {start|stop|restart}”esac[root@localhost ~]# chmod +x /etc/init.d/mongod[root@localhost ~]# chkconfig –add mongod[root@localhost ~]# chkconfig mongod on

Mongdb主从复制就完事了，比Myslq简单吧，比较灵活。

本文出自 ““企鹅”那点事儿” 博客，请务必保留此出处

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