Just use chkconfig mysqld on only one time. And whenever the server gets reboot, it will automatically restart the mysqld service.
You can also check the man page of chkconfig command to run the service on particular runlevels only according to your need.
By default it will start on runlevel 2, 3, 4 & 5.
Last edited by Satyaveer Arya; 05-01-2012 at 06:04 PM.