[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: [libvirt] need custom /dev entries in LXC



On 06/03/2013 06:03 AM, Daniel P. Berrange wrote:
On Wed, May 22, 2013 at 06:22:12PM -0400, Michael R. Hines wrote:
Hi,

We run nvidia devices inside libvirt-managed LXC containers.

It used to be that simply doing:

$ echo 'c 195:* rwm' > /sys/fs/cgroup/devices/libvirt/lxc

Then, after booting the container, we would do:

$ mknod -m 666 /dev/nvidia0 c 195 0

.... would be good enough to run our CUDA applications.

But, according to:

$ cat src/lxc/lxc_container.c

The CAP_MKNOD capability is being dropped and only a specific
set of devices is being created before booting the container.

Is there any reason why this is not per-device configurable?
With recent libvirt you can pass through arbitrary block and
character devices explicitly, using the following XML:

   http://libvirt.org/formatdomain.html#elementsHostDevCaps

As such there is never any need to change cgroups or use
mknod as you describe.


Daniel

Thanks for the response, Daniel. That's good news.


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]