[Pacemaker] Suggestions for managing HA of containers from within a Pacemaker container?

[Serge Dubrouski]

Pacemaker as a scheduler in Mesos or Kubernates does sound like a very
interesting idea. Packaging corosync into super privileged containers still
doesn't make too much sense to me. What's the reason in isolating something
and then giving it all permissions on a host machine?

On Mon, Feb 23, 2015 at 5:20 PM, Andrew Beekhof <andrew at beekhof.net> wrote:

>
> > On 10 Feb 2015, at 1:45 pm, Serge Dubrouski <sergeyfd at gmail.com> wrote:
> >
> > Hello Steve,
> >
> > Are you sure that Pacemaker is the right product for your project? Have
> you checked Mesos/Marathon or Kubernates? Those are frameworks being
> developed for managing containers.
>
> And in a few years they'll work out that they need some HA features and
> try to retrofit them :-)
> In the meantime pacemaker is actually rather good at managing containers
> already and knows a thing or two about HA and how to bring up a complex
> stack of services.
>
> The one thing that would be really interesting in this area is using the
> our policy engine as the kubernates scheduler.
> So many ideas and so little time.
>
> >
> > On Sat Feb 07 2015 at 1:19:15 PM Steven Dake (stdake) <stdake at cisco.com>
> wrote:
> > Hi,
> >
> > I am working on Containerizing OpenStack in the Kolla project (
> http://launchpad.net/kolla).  One of the key things we want to do over
> the next few months is add H/A support to our container tech.  David Vossel
> had suggested using systemctl to monitor the containers themselves by
> running healthchecking scripts within the containers.  That idea is sound.
> >
> > There is another technology called “super-privileged containers”.
> Essentially it allows more host access for the container, allowing the
> treatment of Pacemaker as a container rather than a RPM or DEB file.  I’d
> like corosync to run in a separate container.  These containers will
> communicate using their normal mechanisms in a super-privileged mode.  We
> will implement this in Kolla.
> >
> > Where I am stuck is how does Pacemaker within a container control other
> containers  in the host os.  One way I have considered is using the docker
> —pid=host flag, allowing pacemaker to communicate directly with the host
> systemctl process.  Where I am stuck is our containers don’t run via
> systemctl, but instead via shell scripts that are executed by third party
> deployment software.
> >
> > An example:
> > Lets say a rabbitmq container wants to run:
> >
> > The user would run
> > kolla-mgr deploy messaging
> >
> > This would run a small bit of code to launch the docker container set
> for messaging.
> >
> > Could pacemaker run something like
> >
> > Kolla-mgr status messaging
> >
> > To control the lifecycle of the processes?
> >
> > Or would we be better off with some systemd integration with kolla-mgr?
> >
> > Thoughts welcome
> >
> > Regards,
> > -steve
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-- 
Serge Dubrouski.
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