[lxc-users] Do nested containers require that unprivileged container creation be supported?

Michael H. Warfield mhw at WittsEnd.com
Sat Apr 5 20:13:35 UTC 2014

On Sat, 2014-04-05 at 22:37 +0300, Rami Rosen wrote:
> Hi, Nels,
> Regarding you question, as appeared as the subject of your post:
> "Do nested containers require that unprivileged container creation be
> supported?"

> Fedora 20 does not support user namespaces, as lxc-checkconfig shows;
> so it does not support unprivileged containers. However, I had created
> (with lxc-create) an LXC fedora container under Fedora 20. From within
> that container I created a nested LXC busybox container, and I could
> start that nested container successfully.

Time out!  Breaking news...  Fedora 20 originally did not support user
namespaces on initial install.  Run yum update and reboot...  Then...

[root at hydra mhw]# cat /etc/redhat-release 
Fedora release 20 (Heisenbug)
[root at hydra mhw]# uname -a
Linux hydra.wittsend.com 3.13.7-200.fc20.x86_64 #1 SMP Mon Mar 24 22:01:49 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
[root at hydra mhw]# lxc-checkconfig
Kernel configuration not found at /proc/config.gz; searching...
Kernel configuration found at /boot/config-3.13.7-200.fc20.x86_64
--- Namespaces ---
Namespaces: enabled
Utsname namespace: enabled
Ipc namespace: enabled
Pid namespace: enabled
User namespace: enabled
Network namespace: enabled
Multiple /dev/pts instances: enabled

Looks to be enabled to me.

> Best regards,
> Rami Rosen
> http://ramirose.wix.com/ramirosen

Always check on the latest update.  Things do change in the Fedora


> On Fri, Apr 4, 2014 at 8:02 PM, Nels Nelson <nels.n.nelson at gmail.com> wrote:
> > Hi, I'm trying to create a container nested within another.  I'm sure I'm
> > probably going about it incorrectly.  Here's what I have so far:
> >
> > https://gist.github.com/nelsnelson/9978457
> >
> > The error I encounter seems to be
> >
> >     lxc-create: No such file or directory - failed to create container path
> > for inner
> >     lxc-create: Error creating container inner
> >
> > Is this because the privileges in the outer container are not sufficient?
> >
> > Thanks,
> > -Nels

Michael H. Warfield (AI4NB) | (770) 978-7061 |  mhw at WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
   NIC whois: MHW9          | An optimist believes we live in the best of all
 PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!

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