title: How to imitate servers (without loss of computing power)?
body: <p>I have production environment, which is running on one server. But I need to run 2 instances of one software, each on "another" server. </p>
  
  <p>Is it possible to imitate more servers on one real server for free? Without loss of computing power and network flow in/out of the real server?</p>
  
  <p>EDIT:
  In another words: I want to run two instances of the same software on one machine.
  And then I need to use some function that transport some subinstance from instance1 into instance2. But this function is only possible to use when instance1 is on another server than instance2. So I need to imitate that one of both instances running on local is on different servers.</p>