How to Safely Change the MySQL Data Directory?

Change MySQL Data Directory: Relocating Your Databases

To modify the default MySQL data directory, it is crucial to follow a series of steps to ensure a seamless transition and maintain database accessibility.

1. Halt MySQL Services:
   Start by stopping MySQL using the command:

   sudo /etc/init.d/mysql stop

2. Data Directory Replication:
   Duplicate the existing data directory, typically located at /var/lib/mysql, to the new desired location:

   sudo cp -R -p /var/lib/mysql /newpath

3. MySQL Configuration File Editing:
   Edit the MySQL configuration file, usually /etc/mysql/my.cnf, and modify the 'datadir' entry to reflect the new data directory's path.
4. Modifying AppArmor Profiles:
   In /etc/apparmor.d/usr.sbin.mysqld, locate lines beginning with /var/lib/mysql and update them with the new path.

5. Restart AppArmor:
   Reload the AppArmor profiles using the command:

   sudo /etc/init.d/apparmor reload

6. MySQL Service Restoration:
   Restart MySQL:

   sudo /etc/init.d/mysql restart

7. MySQL Login Verification:
   Log in to MySQL to confirm access to existing databases.

By completing these steps, you can successfully relocate MySQL's data directory to a new path while maintaining access to your databases.

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