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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.

6
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1answer
My Linux kernel must have been configured with user_namespaces when built, but their use is restricted after boot and has to be explicitly enabled. Which sysctl should I use? (If this was turned on, …
asked Aug 13 '16 by imz -- Ivan Zakharyaschev