[Lxc-users] Need simple configuration for embedded ARM LXC

[Serge Hallyn]

Quoting Somnath Mitra (somnath.mitra at xockets.com):
> On Fri, Apr 12, 2013 at 6:53 AM, Serge Hallyn <serge.hallyn at ubuntu.com>wrote:
> 
> > Quoting Somnath Mitra (somnath.mitra at xockets.com):
> >
>  > Since the container rootfs is shared with host I am confused why it
> > cannot
> > > find lxc-init?
> >
> > Sounds like a compilation/packaging problem.  It works for me
> > here, with ubuntu raring:
> >
> > cat > lxc.conf << EOF
> > cat > lxc.conf << EOF
> > lxc.utsname = beta
> > lxc.network.type = empty
> > lxc.rootfs = /
> > lxc.aa_profile = unconfined
> > EOF
> > lxc.utsname = beta
> > lxc.network.type = empty
> > lxc.rootfs = /
> > lxc.aa_profile = unconfined
> > EOF
> >
> > sudo lxc-execute -n foobar -f lxc.conf -l info -o outout -- ps -ef
> > UID        PID  PPID  C STIME TTY          TIME CMD
> > root         1     0  0 08:46 pts/1    00:00:00
> > /usr/lib/x86_64-linux-gnu/lxc/lxc-init -- ps -ef
> > root         2     1  0 08:46 pts/1    00:00:00 ps -ef
> >
> > (an interactive shell doesn't work - just hangs, I don't use
> > lxc-execute so always forget what is expect to work and what
> > isn't)
> >
> 
> Hangs for me too (on the embedded board). Can you comment on possible root
> cause or workaround so we can investigate. My target application shall need
> stdin, stdout and, possibly, stderr.

Hi Daniel,

can you comment on this by chance?  I frankly don't use lxc-execute, and
I know you know of all sorts of special circumstances surrounding it...
For me,

	cat > lxc.conf << EOF
lxc.utsname = beta
lxc.network.type = empty
lxc.rootfs = /
lxc.aa_profile = unconfined
EOF

	lxc-execute -n foobar -f lxc.conf -- ps -ef

works fine, while

	lxc-execute -n foobar -f lxc.donf -- /bin/sh

hangs - some tty session thing?

> > > I have already checked that kernel is configured correctly using
> > > lxc-checkconfig.
> > >
> > > Pls send a pointer to a simple working configuration for embedded
> > systems.
> >
> > Take a look at src/lxc/execute.c:choose_init().  It will look for
> > lxc-init in three places:
> >
> >         LXCINITDIR "/lxc/lxc-init"
> >         /usr/lib/lxc/lxc-init
> >         /sbin/lxc-init
> >
> > LXCINITDIR in ubuntu is /usr/lib/x86_64-linux-gnu, and lxc-init is in
> > fact at /usr/lib/x86_64-linux-gnu/lxc/lxc-init.  (You can find your
> > LXCINITDIR in config.log if you built your own lxc).  But the
> > easier thing might be to just copy lxc-init into /sbin.
> >
> 
> Yes I had put lxc-* binaries in /usr/bin. Putting them in /sbin solved it.
> 
> Thanks,
> SM.