Change MYSQL data directory

 For example, change mysql data directory from /var/lib/mysql to /var/data/mysql

Step1: Copy the /var/lib/mysql to new name /var/lib/mysqlnew

cp -prvf /var/lib/mysql /var/lib/mysqlnew

sudo vi /etc/mysql/my.cnf 

Looking for: 

datadir = /var/lib/mysql

Change to :

datadir  = /var/data/mysql

 

And open file:

sudo vi /etc/apparmor.d/usr.sbin.mysqld

Looking for:

  /var/lib/mysql/ r,

  /var/lib/mysql/** rwk,

 

Change to:

 /var/data/mysql/ r,

  /var/data/mysql/** rwk,

Reload AppArmor profile:

sudo /etc/init.d/apparmor reload

Finally, restart MYSQL:

sudo /etc/init.d/mysql restart