[Lxc-users] How to make a container init DIE after finishing runlevel 0

[Tony Risinger]

this is great stuff, thanks for sharing your script and to Daniel for
the inotifywait trick; i've gotten it to work in my setup.

looking forward to a Just Works (kernel)? solution.... :-) but this is
working splendidly, thanks again.

On Mon, Jan 25, 2010 at 7:50 PM, Michael H. Warfield <mhw at wittsend.com> wrote:
> On Tue, 2010-01-26 at 00:42 +0100, Daniel Lezcano wrote:
>> I trick I just found:
>>
>>  while $(true); do
>>     inotifywait /var/lib/lxc/debian/rootfs/var/run/utmp;
>>     if [ "$(wc -l /cgroup/debian/tasks | awk '{ print $1 }')" = "1" ]; then
>>         lxc-stop -n debian
>>     fi;
>> done
>
>> This command can stay always there and it will trigger a lxc-stop when
>> the container remains with 1 process.
>> No polling and immediate :)
>> At the first glance, it seems to work well, but of course not compatible
>> with upstart.
>
> Oh BABY!  I like.  I like mucho!
>
> I've just cobbled together an "lcx-waiton-init" script that incorporates
> that.  After starting a container, running that script will monitor the
> container and, if it reboots it, restart the container and continue
> monitoring it, with a new log file (my peculiarity).  If it halts, it
> shuts the container down and terminates.  It adds a double quiet option
> and a timeout option to the inotifywait just in case.  I'm going to
> integrate that into my own startup wrapper scripts so it runs
> automatically when a container is started.
>
> Mui Bien!  Gracias!
>
> Attached.
>
> Mike
> --
> Michael H. Warfield (AI4NB) | (770) 985-6132 |  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
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