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User namespaces or short `userns` is a facility that allows a sub-namespace to have its own set of UIDs and GIDs. This allows to use the least privilege principle for LXC containers, but it's not limited to that use case.

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I was just doing something very similar, moving KVM VMs into unprivileged LXC. I was using system containers for this (so they can be started automatically on boot), but with mapped UID/GIDs (user na …
answered May 24 '14 by Borut Mrak