I am looking into the possibility of hosting Online Unity games in my Datacenter.
What kind of hardware is required, and what kind of OS/databases, etc are needed to host a unity game world?
Is there a guidebook for this?
Unity can build for Linux (ubuntu only is formally supported) , OSX and windows and the requirements depends fully on your game. Database is not required unless you yourself use one in your game obviously.
unity is an application. you could set up some virtualization services that allow users to telnet in or something. create an image that has mysql on it with dot net installed (mono or ms). maybe you could provide prototyping services?
for example, you could have your images already pre-configured with uLink, badumna, or photon servers. i know some users would like things to work right away.