Data Management

Set up MySQL database replication to ensure up-to-date backups

Learn how to have a working, replicated MySQL database so your backup is always current.

Configuring the Slave

In order to configure the Slave, open the /etc/mysql/my.conf file, add the following, and save and close that file:

server-id=2

master-host=IP_ADDRESS_OF_MASTER

master-user=USER

master-password=USER_PASSWORD

master-connect-retry=60

replicate-do-db=DATABASE

Where:

  • IP_ADDRESS_OF_MASTER is the actual IP address of the Master server.
  • USER is the database administrator with replication privileges.
  • USER_PASSWORD is the password associated with the USER.
  • DATABASE is the name to be replicated.

This next step requires information returned from the SHOW MASTER STATUS; command that was run. Stop the Slave by issuing these commands:

mysql -u root -p (enter the MySQL admin password)

SLAVE STOP;

You must run the following command:

CHANGE MASTER TO MASTER_HOST='IP_ADDRESS_OF_MASTER', MASTER_USER='USER', MASTER_PASSWORD='USER_PASSWORD', MASTER_LOG_FILE='mysql-bin.007', MASTER_LOG_POS=NUMBER;

Where the following applies:

  • IP_ADDRESS_OF_MASTER is the actual IP address of the Master
  • USER is the MySQL admin user
  • USER_PASSWORD is the password for the USER
  • NUMBER is the Position Number reported from the SHOW MASTER STATUS command.

Restart the Slave by issuing the command SLAVE START; and then exit the MySQL prompt with the command quit. Now you can follow these steps to make sure everything is working:

1. Issue the command mysql -u root -p (enter the database admin password).

2. Issue the command SHOW SLAVE STATUS;.

You should see something like this:

Slave_IO_Running: Yes
Slave_SQL_Running: Yes

If all is set to Yes, you now have a working, replicated MySQL database. Congratulations!

About

Jack Wallen is an award-winning writer for TechRepublic and Linux.com. He’s an avid promoter of open source and the voice of The Android Expert. For more news about Jack Wallen, visit his website getjackd.net.

Editor's Picks