Running docker Ubuntu image on Debian enironment
In docker all images use the same kernel - that is why overhead is minimal - virtualization layer is very thin. All files in ubuntu image from ubuntu, but any image will give you the same output of uname -a, as it is the same kernel.
$ docker run --rm -ti ubuntu root@318f07af2ca7:/# cat /etc/lsb-release DISTRIB_ID=UbuntuDISTRIB_RELEASE=14.04DISTRIB_CODENAME=trustyDISTRIB_DESCRIPTION="Ubuntu 14.04.1 LTS"You don't see host filesystem inside of container unless you will map some directory. The idea of container that it is running in the same way on any host - doesn't matter what installed there - you need only docker.