[lxc-users] Question on using /dev/uio0 inside containers

[Stéphane Graber]

On Mon, Jul 07, 2014 at 02:59:44PM +0000, Anjali Kulkarni wrote:
> Hi,
> 
> I am a newbie to using containers, and I am trying to run a DPDK enabled app inside a system container (which I created using lxc-create). While, lxc-execute works to run the dpdk app, the system container does not, giving me the following error:
> 
> EAL: Cannot open /dev/uio0: No such file or directory
> EAL: Error - exiting with code: 1
> 
> Where, one 10G ethernet device on host has been assigned to the uio_igb driver on the host, and hence is visible from host:
> root:/# ls /dev/uio0
> /dev/uio0
> 
> But /dev/uio0 is not visible in the container.
> 
> I was reading about autodev and how using autodev hook you can do an mknod to create the devs, but I am not sure what is the right approach here.  If I look in the dev of the rootfs of the container, I see some dev are already created/shared with the host. I want to do something similar for /dev/uio0. Can I just share/mount the /dev/uio0 from host onto container or use autodev?
> I just want the container to be able to use the /dev/uio0 just as if on host - what's the right way to approach/make this work?

There are a few ways to do what you want, in any case, make sure you
have this node listed in your cgroup.device's configuration so once it's
there you can actually access it.

I can thnk of three ways to have it available from inside the container:
 - Just mknod it by hand and use it
 - Use the lxc-device tool to add it once the container is started
 - Add this to your container's config:
   "lxc.mount.entry = /dev/uio0 dev/uio0 none bind,create=file"

The last two options expect LXC 1.0 or higher.

> 
> Thanks
> Anjali
> 
> 

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-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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