[lxc-devel] lxc_monitord - monitor exiting

[S.Çağlar Onur]

Yeah, I think you all correct and I'm just confused - probably direct
effect of lack of caffeine. And no, it's not complicating something for me,
it's working great. I just want to make sure that I'm wrong :)


On Fri, Apr 26, 2013 at 4:37 PM, Dwight Engen <dwight.engen at oracle.com>wrote:

> On Fri, 26 Apr 2013 22:07:22 +0200
> Stéphane Graber <stgraber at ubuntu.com> wrote:
>
> > On 04/26/2013 09:42 PM, S.Çağlar Onur wrote:
> > > Hey Dwight,
> > >
> > > I'm observing following behavior with staging tree and just wanted
> > > to make sure that what I'm seeing is the expected;
> > >
> > > * Initially nothing runs
> > >
> > > [caglar at qgq:~/Projects/lxc/examples] sudo ./list
> > > bankai (STOPPED)
> > > bleach (STOPPED)
> > > zangetsu (STOPPED)
> > >
> > > * I start one container using the API
> > >
> > > [caglar at qgq:~/Projects/lxc/examples] sudo ./start -name zangetsu
> > > Starting the container...
> > >
> > > [caglar at qgq:~/Projects/lxc/examples] sudo ./list
> > > bankai (STOPPED)
> > > bleach (STOPPED)
> > > zangetsu (RUNNING)
> > >
> > > * monitord starts as expected but exits after 30 seconds later
> > > (although container is still running);
> > >
> > > [caglar at qgq:~/Projects/lxc-upstream(staging)] tail -f
> > > /var/lib/lxc/lxc-monitord.log
> > >    lxc-monitord 1367004858.616 NOTICE   lxc_monitord - monitoring
> > > lxcpath /var/lib/lxc
> > >    lxc-monitord 1367004888.677 NOTICE   lxc_monitord - no clients
> > > for 30 seconds, exiting
> > >    lxc-monitord 1367004888.677 NOTICE   lxc_monitord - monitor
> > > exiting
> > >
> > > [caglar at qgq:~/Projects/lxc/examples] sudo ./list
> > > bankai (STOPPED)
> > > bleach (STOPPED)
> > > zangetsu (RUNNING)
> > >
> > > [caglar at qgq:~/Projects/lxc/examples] ps aux | grep monitord
> > > caglar   28404  0.0  0.0   7240   624 pts/54   S+   15:34   0:00
> > > tail -f /var/lib/lxc/lxc-monitord.log
> > > caglar   29037  0.0  0.0   9436   948 pts/0    S+   15:38   0:00
> > > grep --color=auto monitord
> > > [caglar at qgq:~/Projects/lxc/examples]
> > >
> > > I'm asking cause I was under the impression that lxc-monitord will
> > > keep running as long as there is a container. Am I wrong?
> >
> > I believe the monitor will get spawned the first time something needs
> > it (lxc-monitor/lxc-wait) and exit 30s after the last client
> > disconnects. It'll then be respawned the next time lxc-monitor or
> > lxc-wait is started again that container.
>
> Yep Stéphane, that is correct. Also note that the monitord is per
> lxcpath, not per container.
>
> Çağlar, you may have been slightly confused because if you start a
> container in daemon mode through the API, the API does an internal
> lxc_wait() and thus a monitord will get spawned when you first start a
> container, but will go away ~30 seconds afterwards.
>



-- 
S.Çağlar Onur <caglar at 10ur.org>
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