As root run:

/sbin/chkconfig --add mysqld
/sbin/chkconfig --level 2345 mysqld on

then run

/sbin/chkconfig --list

 

to check everything was set correctly.

 

 

Sources:

http://spicysquid.blogspot.com/2007/01/adding-unix-services-on-startup.html

http://fedorasolved.org/Members/opsec/installing-configuring-mysql-server