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, the common architecture mode is master-slave

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, the common architecture mode is master-slave

[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 listen dtcp0 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 2.0771484375 GBtest 0.203125 GB>

Master log

Slave log

After the database is created, the master and slave logs show that the master can synchronize the master data (applied 1 operations) from the slave connections ). 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

[Root @ localhost ~] # MongoMongoDB shell version: 2.4.9-rc0connecting to: test> db. printReplicationInfo () configured oplog size: 2048 MBlog length start to end: 1494 secs (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

[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 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 master-slave replication is complete. It is simpler and more flexible than Myslq.

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