HA: restarting control plane nodes in parallel creates unexpected pacemaker shutdown

[Damien Ciabrini]

Originally reported in [1].

Minor update is a sequential process, each node of the control plan
must be updated sequentially.

But in a composable HA control plane comprised of several roles (DB, API, Messaging...),
nothing prevents each role can from running its minor update in parallel of other roles.

Unfortunately this has a side effect in pacemaker: sometimes stopping several pacemaker
nodes concurrently can perturbate the election of a new DC, and cause a spurious stop
on the impacted pacemaker node. This node would then stay down, and prevent the usual
minor update workflow to finish succesfully.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1872404

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-heat-templates 14.0.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-heat-templates 13.2.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-heat-templates 11.5.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-heat-templates 12.4.3 release.