[openstack-dev] [tripleo] Stein blueprint - Plan to remove Keepalived support (replaced by Pacemaker)

Juan Antonio Osorio jaosorior at gmail.com
Fri Jul 13 19:11:53 UTC 2018

 Sounds good to me. Even if pacemaker is heavier, less options and
consistency is better.

Greetings from Mexico :D

On Fri, 13 Jul 2018, 13:33 Emilien Macchi, <emilien at redhat.com> wrote:

> Greetings,
> We have been supporting both Keepalived and Pacemaker to handle VIP
> management.
> Keepalived is actually the tool used by the undercloud when SSL is enabled
> (for SSL termination).
> While Pacemaker is used on the overcloud to handle VIPs but also services
> HA.
> I see some benefits at removing support for keepalived and deploying
> Pacemaker by default:
> - pacemaker can be deployed on one node (we actually do it in CI), so can
> be deployed on the undercloud to handle VIPs and manage HA as well.
> - it'll allow to extend undercloud & standalone use cases to support
> multinode one day, with HA and SSL, like we already have on the overcloud.
> - it removes the complexity of managing two tools so we'll potentially
> removing code in TripleO.
> - of course since pacemaker features from overcloud would be usable in
> standalone environment, but also on the undercloud.
> There is probably some downside, the first one is I think Keepalived is
> much more lightweight than Pacemaker, we probably need to run some
> benchmark here and make sure we don't make the undercloud heavier than it
> is now.
> I went ahead and created this blueprint for Stein:
> https://blueprints.launchpad.net/tripleo/+spec/undercloud-pacemaker-default
> I also plan to prototype some basic code soon and provide an upgrade path
> if we accept this blueprint.
> This is something I would like to discuss here and at the PTG, feel free
> to bring questions/concerns,
> Thanks!
> --
> Emilien Macchi
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