Wednesday, March 7, 2012

MySQL Master-Slave Configuration

In this tutorial, I have only shown the commands to configure Master-Slave replication as the details, pros/cons of the setup is available throughout the web.


Master Server Configuration


(i) Create mysql replication user


(ii) Grant permissions to replication user


mysql> GRANT REPLICATION SLAVE ON *.* To ‘replication_user’@'%.mydomain.com’ IDENTIFIED BY ‘password’;


(iii) Setting the replication Master Configuration directives in my.cnf


Edit the file my.cnf or my.ini For Replication you must enable binary logging on master.


[mysqld]


log-bin=/var/lib/mysql/mysql-bin


server-id=1


innodb_flush_log_at_trx_commit=1 sync-binlog=1


# For Greatest Possible Durability & consistency in replication setup Use InnoDB with transitions


Ensure that skip-networking is not enabled on master. Disable if ndb-cluster configuration directives are present.


Replication Slave configuration


(i) Edit /etc/my.cnf OR my.ini file


[mysqld] server-id=2


Check Master Replication Information


(i) Check & note the details


mysql> FLUSH TABLES WITH READ LOCK;


mysql> SHOW MASTER STATUS;


Note down the file name, position, etc for future correspondance.


(ii) Create a data snapshot of Master using “mysqldump”


mysql> FLUSH TABLES WITH READ LOCK;


Take dump of all databases


mysql> mysqldump –all-databases –master-data > dbdump.db


(iii) Setting up replication with new master-slave


Ensure that master is properly configured (my.cnf) & mysqld is running on it. On master release the read locks:


mysql> UNLOCK TABLES;


Slave server final configuration


(i) On Slave make sure also that my.cnf is properly configured & mysqld is running. After that execute these statements on slave:


mysql> CHANGE MASTER TO MASTER_HOST=’master_host_name’, MASTER_USER=’master_replication_user_name’, MASTER_PASSWORD=’replication_user_password’, MASTER_LOG_FILE=’recorded_log_file_name’, MASTER_LOG_POS=recorded_log_position;


(ii) Setting up replication with existing data


Import the dumped database file from master onto slave & restore it.


shell> mysql < dbdump.db


Start the slave


mysql> START SLAVE;



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