This how-to guide explains how to update a DHCP and YUM repository Server with a new OS so you can keep up-to date with the latest OS versions.
This book can be used in conjunction with:
How to set up a YUM repository server on Linux for automatic client updates:
http://www.lulu.com/content/149236
and
How to set up a DHCP boot server for network booting:
http://www.lulu.com/content/146595