[Lxc-users] [lxc-attach error] Failed to open /proc/4468/ns/pid. Failed to enter namespace

[Serge Hallyn]

Quoting Frank Scholten (frank at frankscholten.nl):
> frank at franktop:~$ uname -a
> Linux franktop 3.2.0-25-generic #40-Ubuntu SMP Wed May 23 20:30:51 UTC
> 2012 x86_64 x86_64 x86_64 GNU/Linux
> 
> I thought setns was added in 3.0?

Not for pid ns.  do 'ls /proc/self/ns' to see the list of namespaces to
which you can setns.

> I also have the setns man page. How
> do I enable it? Do I have to compile a new kernel?
> 
> Cheers,
> 
> Frank
> 
> On Mon, Oct 15, 2012 at 6:25 PM, Serge Hallyn
> <serge.hallyn at canonical.com> wrote:
> > Quoting Frank Scholten (frank at frankscholten.nl):
> >> Hi all,
> >>
> >> I am trying to run commands inside the container.
> >>
> >> Running lxc 0.7.5.1, commit 60a742e0afd from sourceforge.
> >>
> >> I created and started an Ubuntu container and when I run
> >>
> >> $ sudo lxc-attach -e -n test whoami
> >>
> >> I get
> >>
> >> 'Failed to open /proc/4468/ns/pid. Failed to enter namespace'
> >>
> >> Any idea what could be wrong?
> >
> > Your kernel does not support setns for pid.  /proc/$$/ns/pid
> > does not exist.
> >
> > -serge
> >