Comment 9 for bug 1738768

Reviewed: https://review.openstack.org/556454
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=402a0483eaa149951c493ec8a194e665bdbc09c1
Submitter: Zuul
Branch: stable/queens

commit 402a0483eaa149951c493ec8a194e665bdbc09c1
Author: Jiri Stransky <email address hidden>
Date: Mon Mar 12 17:02:36 2018 +0100

    Add pre_upgrade_rolling_tasks

    The resultin pre_upgrade_rolling_steps_playbook will be executed in a
    node-by-node rolling fashion at the beginning of major upgrade
    workflow (before upgrade_steps_playbook).

    The current intended use case is special handling of L3 agent upgrade
    when moving Neutron services into containers. Special care needs to be
    taken in this case to preserve L3 connectivity of instances (with
    regard to dnsmasq and keepalived sub-processes of L3 agent).

    The playbook can be run before the main upgrade like this:

    openstack overcloud upgrade run --roles overcloud --playbook pre_upgrade_rolling_steps_playbook.yaml

    Partial-Bug: #1738768
    Change-Id: Icb830f8500bb80fd15036e88fcd314bf2c54445d
    Implements: blueprint major-upgrade-workflow
    (cherry picked from commit ae085825e22cb4ce7bf877087c2e324b8bec1f03)