I changed the permissions or ownership of /var/lib/mysql - What should it be?
The MySQL data directory ownership should not be changed, but if MySQL is not starting on your server, the correct ownership is mysql:mysql and the permissions of the directory should be 0751.
To set these, run the following commands as root via SSH or WHM terminal:
chmod -v 0751 /var/lib/mysql
chown -v mysql:mysql /var/lib/mysql