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>The absolute star feature of docker is being able to mount a file from the host to the container.

This is a simple bind-mount and isn't special at all.

    mount("/foo", "/container/foo", "none", MS_BIND);
Also, virtual machines have had things like 9p that allow the same thing.

I don't think there is enough RAM in my laptop to run five VMs simultaneously :)

Yeah, containers are much slimmer.

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