How to Set Up MySQL Master-Slave Replication
Abstract: so not changes made after taking backup. mysql> use mydb| mysql-bin.000002 | 107 | mydb | |
This article will help you to setup master-slave replication between MySQL servers. We are using MySQL 5.5 on CentOS 6.3. I hope it will help you to setup replication.
Setup Details:Master Server: 192.168.1.10 Slave Server: 192.168.1.20 Database: mydb
If you are using different – different versions of MySQL on Master and Slave use this link to check compatibility.
1. Setup MySQL Master Server- Create an mysql account on Master server with REPLICATION SLAVE privileges to which replication client will connect to master.
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl_user'@'192.168.1.20' IDENTIFIED BY 'secretpassword'; mysql> FLUSH PRIVILEGES;
mysql> use mydb; mysql> FLUSH TABLES WITH READ LOCK; mysql> exit;
# vim /etc/my.cnf
[mysqld] log-bin=mysql-bin binlog-do-db=mydb server-id=1 innodb_flush_log_at_trx_commit=1 sync_binlog=1
# service mysqld restart
mysql > SHOW MASTER STATUS; +------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000002 | 107 | mydb | | +------------------+----------+--------------+------------------+
The above output is showing that the current binary file is using mysql-bin.000002 and offset value is 107. Note down these values to use on slave server.
# mysqldump -u root -p mydb > mydb.sql # scp mydb.sql 192.168.1.20:/opt/
mysql> UNLOCK TABLES;2. Setup MySQL Slave Server
# vim /etc/my.cnf
[mysqld] server-id=2 replicate-do-db=mydb
server-id always be an non zero numeric value. These value will never be similar with other master and slave servers.
# /etc/init.d/mysqld restart
# mysql -u root -p mydb < mydb.sql
mysql> CHANGE MASTER TO MASTER_HOST='192.168.1.10', -> MASTER_USER='repl_user', -> MASTER_PASSWORD='secretpassword', -> MASTER_LOG_FILE='mysql-bin.000002', -> MASTER_LOG_POS=107;
mysql> SLAVE START;
mysql> show slave status G
*************************** 1. row *************************** Slave_IO_State: Master_Host: 192.168.1.15 Master_User: repl_user Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 107 Relay_Log_File: mysqld-relay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: mysql-bin.000002 Slave_IO_Running: No Slave_SQL_Running: No Replicate_Do_DB: mydb Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 107 Relay_Log_Space: 107 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 1 1 row in set (0.00 sec) mysql>
MySQL Master-slave Replication has been configured successfully on your system and in working mode. Thanks for using this tutorial, Kindly do not forgot to share it with your friends.