Comment 9 for bug 1839021

Reviewed: https://review.opendev.org/675127
Committed: https://git.openstack.org/cgit/openstack/charm-keystone/commit/?id=21d212cb2739a3ff1b08d8d96916dfd638f06ffe
Submitter: Zuul
Branch: master

commit 21d212cb2739a3ff1b08d8d96916dfd638f06ffe
Author: Alex Kavanagh <email address hidden>
Date: Wed Aug 7 15:09:13 2019 +0100

    Ensure that keystone service is paused if needed on series upgrade

    During series upgrade, the keystone packages get re-installed as the
    underlying Linux has been upgraded and new package sets are updated and
    then pulled in. For trusty->xenial this means that keystone.service
    gets enabled which then breaks haproxy. On install, on xenial+, the
    keystone.service is disabled in the install hook. This just replicates
    this in the series-upgrade hook.

    Change-Id: Ic5ed6cf354d5545b9e554e205a048955a381e0f5
    Closed-Bug: #1839021