[Lxc-users] mknod inside systemd container

[Michael H. Warfield]

On Tue, 2013-04-02 at 16:02 +0100, John wrote:
> If my understanding is correctl, to stop systemd trying to launch udev 
> and generally make a mess of everything inside a container, you need to 
> remove the mknod capability from the container.

Ah...  That's kind of old information and not really effective.

> But what if I want 
> (need) to be able to use mknod inside a container, how can I do that 
> with a systemd container?

1) Get the latest lxc.  lxc 0.8 might suffice for systemd in a container
but not with systemd in the host and I wouldn't recommend it.  0.9.0 is
being pulled and bundled now.  It's not up yet but 0.9.0.rc1 is.

2) You'll have to add "lxc.autodev = 1" to your configuration file.

I have found that this works to get recent systemd containers (Fedora
17) to work but Fedora 15 and Fedora 16 (neither of which are supported
any longer) work due to udev / systemd interaction.

I would recommend waiting a couple of days until 0.9.0 is up and then
pulling it down and building it.  That's your best shot with systemd.

> I have this container that is a builder of system images for other nodes 
> (containers and/or metal boxes). In order to correctly do this it needs 
> to execute mknod inside the image as it builds it. (note, device nodes 
> created doesn't need to be usable in the context of the image being 
> built - the builder just needs to be able to create it).
> 
> I've been doing this for ages under sysvinit and it's been fine. I have 
> just migrated this builder container to systemd and hit this problem... 
> Is there another way to keep systemd in line other than removing the 
> mknod capability ?
> 
> Thanks,
> John
> 
> 
> 
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Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
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