How can Docker on a Debian host work with an Ubuntu image?

Question

LXC

Something I did not quite understand the topic about the linux container. Clarify who is not too lazy)
How can I work in the image of Ubuntu 10.04 sitting in Debian? (docker run -i -t ubuntu)
That is, you can easily run outdated os on a fresh kernel? (I have 3.16.0-0.bpo.4-amd64)
There are probably deprecated things in there ...
If you put ubuntu 10.04 on a separate machine, is 100% compatibility of application execution with the docker environment guaranteed?

Answer 1

You are not launching the kernel, but your application.