Comment 0 for bug 1711209

While testing openstack upgrade from M to N and O release, the ncc after the upgrade gets stuck at "db migration" and eventually (it takes about 20mins) errors to:

nova-cloud-controller/1* error idle 1/lxd/9 10.230.40.26 8774/tcp hook failed: "shared-db-relation-changed" for mysql:shared-db

Also noticed that the none leader ncc fails to start haproxy and memcached, which blocks the service:
nova-cloud-controller/0 blocked idle 0/lxd/9 10.230.40.39 8774/tcp Services not running that should be: haproxy, memcached

I have hit this issue on every try. All charms were upgraded to 17.02 release prior to openstack upgrade.

Charm release version:
Stdout: |
    commit-sha-1: 8c0168c9c37b97f7e85684b740c9014a12a5e3a0
    commit-short: 8c0168c
    branch: HEAD
    remote: https://github.com/openstack/charm-nova-cloud-controller
    info-generated: Thu Jul 6 19:28:20 UTC 2017
    note: This file should exist only in a built or released charm artifact (not in the charm source code tree).
  UnitId: nova-cloud-controller/1

sosreport from the affected unit is attached