If you have a dedicated database server and the partition with the MySQL database fills up (or starts getting low), you can move your MySQL databases to a different location.
Let’s say you want to move the database to /home/mysql
- The first step is to stop MySQL so that all your data gets copied correctly.
$ /etc/rc.d/init.d/mysql stop
- Create the new database directory in the new location
$ mkdir /home2/mysql
(NOTE: At this point many people would use the move command (mv) instead of the copy command (cp). I ALWAYS copy the files… so that I can go back and undo my changes later!)
- Copy the database files from the first harddrive to the second harddrive
$ cp -R /var/lib/mysql/ /home/mysql
- Set the correct owner and group, permissions of the new database directory
$ chown -R mysql.mysql /home/mysql/
- Rename your old database directory
$ mv /var/lib/mysql/ /var/lib/mysql_old
- Create a symbolic link from the old database directory to the new one for any programs that rely on the default location
$ ln -s /home/mysql/ /var/lib/mysql
- Set the correct owner and group on the symbolic link
$ chown mysql.mysql /var/lib/mysql
- Edit the configuration file (/etc/my.cnf) to update the changes.
Comment out the old settings and add a line for the new one as you can see below
save your configuration files (my.cnf) and exit your text editor
- Restart MySQL
$ /etc/rc.d/init.d/mysql start
- Update the AppArmor configuration file (if necessary).
- If MySQL refuses to start look in /var/log/mysqld.log for the reason