This article introduces to you about setting up master-slave replication between MySQL servers. Let’s take a look at the specific content.
Setting details:
Master server: 192.168.1.10
Slave server: 192.168.1.20
Database: mydb
1. Set up the MySQL main server
Create a server with REPLICATION SLAVE permissions on the main server mysql account, the replication client will connect to the master.
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl_user'@'192.168.1.20' IDENTIFIED BY 'secretpassword'; mysql> FLUSH PRIVILEGES;
Have block write statements on all tables, so do not make changes after backup.
mysql> use mydb; mysql> FLUSH TABLES WITH READ LOCK; mysql> exit;
Edit the mysql configuration file and add the following code under the [mysqld] section.
# 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
Restart the master mysql server for the changes to take effect.
# service mysqld restart
Use the following command to check the current binary log file name (File) and current offset (Position) value.
mysql > SHOW MASTER STATUS; +------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000002 | 107 | mydb | | +------------------+----------+--------------+------------------+
The above output shows that the current binary file is using mysql-bin.000002 with an offset value of 107. Note these values for use on the slave server.
Back up the database and copy it to slave mysql server.
# mysqldump -u root -p mydb > mydb.sql # scp mydb.sql 192.168.1.20:/opt/
After completing the backup, remove the READ LOCK from the table so that changes can be made.
mysql> UNLOCK TABLES;
2. Set up MySQL Slave Server
Edit the salve mysql configuration file and add the following values under the [mysqld] section.
# vim /etc/my.cnf
[mysqld] server-id=2 replicate-do-db=mydb
server-id is always a non-zero value. These values will never be similar to other masters and slaves.
Restart the mysql slave server. If you have configured replication, please use -skip-slave-start when starting. Do not connect to the master server immediately.
# /etc/init.d/mysqld restart
Use the following commands to set option values on the slave server.
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;
Finally start the slave thread
mysql> SLAVE START;
Check the status of the slave server.
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 successfully configured on your system and work mode.
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