Micro Virtual Machine Unix?

Is ther开发者_如何学JAVAe a way to create and use "Micro Virtual Machines" on Unix ?

For example to keep an entire environ for Ruby Rails (rails versio, ruby...) that we can mount on a unix system ?

I'm not speaking about heavy-weight Virtualization as VmWare, Proxmox but a lighter system to virtualize an environment of programs.

There is virtualenv in Python world for such things so I think this will help you: Ruby equivalent of virtualenv?