A quick search on Amazon brings this up:
http://www.amazon.co.uk/Understandin...365174&sr=8-15
'Understand Web Hosting On Linux' - I think this would be suitable for you as you seem to be a new comer to webhosting in general and Linux.
You can always do more in depth searches, as that book is only really touching the tip of the ice berg.
Hope that helps.
__________________
Regards,
Josh Hold
eUKhost Blog: Over 1000 Computer Related Articles to Sink Your Teeth Into!
LDN GIGS - Gig Listings for London
Super Moderator 
I'm only a forum gremlin (moderator), and do not work for eUKhost in any way. Opinions expressed by me are mine only, and do not reflect those of either eUKhost or any company that may be listed above.
I don't bite, honest.