Anyone know of virtualisation like this?

This is for educational purposes only...

Does anyone know of very, very simple Linux container virtualisation software? The only feature I need it to support is to be migrateable between different servers. So, for example:

1. User deploys a server with Provider X using OS A.
2. They run a script that gives them a single virtualised environment to work in
3. They decide they want to move to Provider Y using OS B
4. They re-run the script on the new server and run 1 command to copy the environment over.

If this doesn't exist, can anyone point me in the right direction about building something like this? LXC/VZ are way too complex for this.

This is to solve the problem of having to set up application dependencies again and again for each new server.