MongoDB master-slave Replication

In the production environment, a single database can no longer meet business requirements. Master-slave database replication is commonly used in the architecture. It is used for backup, high availability, and read/write splitting to improve data processing performance and redundancy, common architecture modes include one master, one master, multiple slaves, and two masters. I will not talk much about the features of the MongoDB database, as Baidu says in more detail. Our architecture is one master and one slave.

Environment Description:

OS: CentOS6.5 _ x64

Master): 192.168.0.201

From Slave): 192.168.0.202

The Master/Slave database directory is in/usr/local/mongodb/data

Log directory/usr/local/mongodb/logs

1. Primary mongodb Configuration

[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 # port fork = true # Run logpath =/usr/local/mongodb/logs/mongodb as a daemon. log # log File logappend = true # log output mode dbpath =/usr/local/mongodb/data # database location maxConns = 1024 # maximum number of database connections master = true # master mode oplogSize = 2048 # log rolling, unit: M

2. Configure from Mongodb

[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 fork = truelogpath =/usr/local/mongodb/logs/mongodb. loglogappend = truedbpath =/usr/local/mongodb/datamaxConns = 1024 slave = true # source = 192.168.0.201: 27017 # specify the master node dbautoresync = true # automatic synchronization

3. Add environment variables and start 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 # Start [root @ localhost ~] # Netstat-tupln | grep primary dtcp 0 0 0.0.0.0: 28017 0.0.0.0: * LISTEN 1923/primary D tcp 0 0 0.0.0.0: 27017 0.0.0.0: * LISTEN 1923/primary d

# The log information on the master database indicates that the master database allows connection of 192.168.0.202 from Port 45458 of the database.

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# Synchronize the master database 192.168.0.201 from the log information

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4. Test Mongodb master-slave Replication

# Create a database test with the Set Name test. Insert a field AGE: 18. Then, check that the data has been synchronized from the database showdbs. The syntax is very different from that of Mysql.

[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>

Master log

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Slave log

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After the database is created, the master and slave logs show that the master can synchronize the master data from applied 1 operations ). The Operation Records of the primary database are OpLog logs, indicating that the principle of the master-slave database is to regularly obtain oplog records from the primary server and then execute them on the local machine.

5. view master-slave replication status

# View master

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[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)>

# Viewing from

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

# Disabling Mongodb Databases

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

# Write a simple SysV management script

[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 in        start)        $PROG -f $CONF &> /dev/null        echo "Starting mongodb:                 [ OK ]"        ;;        stop)        $PROG -f $CONF --shutdown &> /dev/null        echo "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 master-slave replication is complete. It is simpler and more flexible than Myslq.

This article is from the "Penguin" blog, please be sure to keep this http://going.blog.51cto.com/7876557/1348589