A lot of the docker examples I have seen involve images of an os, albeit proably a stripped down version. If you have an existing RHEL system with lxc you can just execute a containerized bash. Can docker do something similar or do you always need base images that are unrelated to the host OS.
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lxc-execute does not chroot nor provides a mount namespace, this is why you can start any command with it.
This is currently not possible with Docker, but it should be soon. With the -o you will be able to select which namespace you want to use.
creack
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