[systemd-devel] udev within a container

Daniel P. Berrange berrange at redhat.com
Fri Jul 26 08:20:33 PDT 2013

On Fri, Jul 26, 2013 at 05:16:16PM +0200, Kay Sievers wrote:
> On Fri, Jul 26, 2013 at 5:09 PM, Rob Spanton <rspanton at zepler.net> wrote:
> > I would like to run some processes inside a container that interact with
> > udev.  Ideally udev would be within the same container as those
> > processes, as then I could also have udev rules that started other
> > things within that container too...
> >
> > However, as far as I can tell, it's not possible to run udev within a
> > container -- is this correct?  Is there a magical workaround that I
> > haven't found!?
> There is no real support to run udev inside a container. It might be
> possible to hack around that, but it's nothing that seems convincing
> so far. We just run containers without any udev setup, but with a
> minimal pre-setup /dev.

Furthermore, in the absence of any "devices" namespace in the kernel,
it would be a security flaw to allow a process inside the container
(whether udevd or something else) the permission to mknod. So you must
always pre-populate /dev and remove CAP_MKNOD instead of running udev,
if you want any security.

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