[libvirt-users] Permission problem with /dev/net/tun

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi lxc folks, the symptom my libvirt LXC container suffers from is: root@depot:/dev/net# ls -la total 0 drwxr-xr-x 2 root root 40 Jun 29 16:26 . drwxr-xr-x 5 root root 480 Jun 29 16:26 .. root@depot:/dev/net# mknod tun c 10 200 mknod: `tun': Operation not permitted The host is an up-to-date AMD64 Ubuntu raring on 3.8.0-25-generic that was formerly installed from precise and then upgraded. The guest is Ubuntu precise; however, I see the same symptom in another raring container on the same host. What I tried to resolve this: 1) On the host, I echoed various stuff to the cgroup device files: cd /sys/fs/cgroup/devices/libvirt/lxc echo "c 10:200 rwm" > devices.allow echo "c 10:200 rwm" > depot/devices.allow echo a > depot/devices.allow ... and I see the successful results in depot/devices.list, but no success. 2) I inserted a line "/dev/net/tun rwk," into /etc/apparmor.d/abstractions/lxc/container-base - no change. (I know, it seems kind of pointless - because it's about permissions to a device, not a path. You may deduce my desperation from this ... SELinux is not active. Mounts on /dev look normal to me: devfs on /dev type tmpfs (rw,mode=0755) devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) devpts on /dev/ptmx type devpts (rw,nosuid,relatime,gid=5,mode=620,ptmxmode=666) cgroup on /sys/fs/cgroup/devices type cgroup (rw,relatime,devices) Now comes the weird part: Once I umount /dev inside the container, the "hidden" /dev appears which contains a usable /dev/net/tun. So the mknod problem is probably due to the dropped capabilities - but why/how mounts the container a more restricted /dev on top of the prepared one ...? Thanks & regards Thomas