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.

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Josh Hold
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