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...like it has still > got the CAP_MKNOD permission and so is strying to start things it should > not have like udev, and various filesystems. > > Daniel I was able to reduce the problem by not using libvirt nor systemd. I've created a bash process inside user namespace with mapping root_inside<->root_outside. I've used a program from https://lwn.net/Articles/532593/ : ./userns_child_exec -U -M '0 0 1' -G '0 0 1' bash This program simply calls clone with CLONE_NEWUSER flag and set proper uid_map and gid_map. The test commands are as follows: mkdir /test mount...

Hi there! I am trying to turn on user namespace by adding following lines to the config: <idmap> <uid start='0' target='0' count='100000'/> <gid start='0' target='0' count='100000'/> </idmap> As you can see the root in container is mapped to the root outside. I was expected to see no difference