[ClusterLabs Developers] bundle/docker: zombie process on resource stop

[Ken Gaillot]

On Thu, 2017-07-27 at 23:26 +0200, Jan Pokorný wrote:
> On 24/07/17 17:59 +0200, Valentin Vidic wrote:
> > On Mon, Jul 24, 2017 at 09:57:01AM -0500, Ken Gaillot wrote:
> >> Are you sure you have pacemaker 1.1.17 inside the container as well? The
> >> pid-1 reaping stuff was added then.
> > 
> > Yep, the docker container from the bundle example got an older
> > version installed, so mystery solved :)
> > 
> >   pacemaker-remote-1.1.15-11.el7_3.5.x86_64
> 
> As with docker/moby kind of bundles, pacemaker on host knows when it
> sets pacemaker_remoted as the command to be run within the container
> or not, it would be possible for it in such case check whether this
> remote peer is recent enough to cope with zombie reaping and prevent
> it from running any resources if not.

Leaving zombies behind is preferable to being unable to use containers
with an older pacemaker_remoted installed. A common use case of
containers is to run some legacy application that requires an old OS
environment. The ideal usage there would be to compile a newer pacemaker
for it, but many users won't have that option.

> The catch -- pacemaker on host cannot likely evalute this "recent
> enough" part of the equation properly as there was no LRMD protocol
> version bump for 1.1.17.  Correct?  Any other hints it could use?
> 
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-- 
Ken Gaillot <kgaillot at redhat.com>