Comment 4 for bug 1871482

Reviewed: https://review.opendev.org/762579
Committed: https://opendev.org/openstack/tripleo-heat-templates/commit/629485dde5d6b96d38688f362362fac45392ece9
Submitter: Zuul
Branch: master

commit 629485dde5d6b96d38688f362362fac45392ece9
Author: Oliver Walsh <email address hidden>
Date: Thu Nov 12 20:38:26 2020 +0000

    Move cell_v2 discovery off compute hosts

    In I12a02f636f31985bc1b71bff5b744d346286a95f cell_v2 discovery was
    originally moved from the nova-api container to the
    nova-compute|nova-ironic containers in order to run cell
    discovery during a scale up where the controllers are omitted
    (e.g to exclude the controllers from a maintenance window).

    This requires api database credentials on the compute node, which is
    forbidden, so it must move back to a nova-api host as a pre-requisite
    for removing these credentials in a follow-up patch.

    Scale-up while omitting the controllers will no longer work out of the
    box. Either a manual cell_v2 discovery can be run after scale up, or an
    additional node can be deployed using the NovaManager tripleo role.

    Related-bug: #1786961
    Related-bug: #1871482
    Change-Id: I47b95ad46e2d4e5b1f370a2f840826e87da2d703