A man hostname command will tell you all you need to know.
Rob is quite correct (if he wasn't, he wouldn't deserve the TheAdmin epithet ), the /etc/sysconfig/network file is the place that your hostname should be defined.
Haha, well, I wouldn't say I *deserve* TheAdmin epithet. I'm a true Linux newb, yet I am The Admin at my company, which is why I chose this username. Always verify what I say, I could be exceptionally wrong!