[lxc-users] uid range not allowed

[Andreas Vögele]

Christoph Willing writes:

> I'm following the guide to run X apps in a container at:
>       https://www.stgraber.org/2014/02/09/lxc-1-0-gui-in-containers/
>
> As a starting point, I have a normal unprivileged container running
> perfectly. However when I change the id_map configuration to look
> like:
> lxc.id_map = u 0 100000 1000
> lxc.id_map = g 0 100000 1000
> lxc.id_map = u 1000 1000 1
> lxc.id_map = g 1000 1000 1
> lxc.id_map = u 1001 101001 64535
> lxc.id_map = g 1001 101001 64535
>
> the container fails to start, claiming:
>
> chris at d6:~/.local/share/lxc$ lxc-start -n x11-test-x86_64 -F
> newuidmap: uid range [1000-1001) -> [1000-1001) not allowed
> lxc-start: start.c: lxc_spawn: 1161 failed to set up id mapping
> [...]
> Can anyone shed light on this problem please?

You've got to add the id to /etc/subuid and /etc/subgid. Example:

chris:1000:1
chris:100000:65536

Kind regards,
Andreas