Actually it's quite possible to run a full Cloud Foundry environment in a single VM, as seen with Stackato (http://www.stackato.com/ http://www.stackato.com/),

Actually it's quite possible to run a full Cloud Foundry environment in a single VM, as seen with Stackato (http://www.stackato.com/ http://www.stackato.com/), which can then be scaled out as necessary.