Unable to find implementation for relation: provides of nova-designate

[Dmitrii Shcherbakov]

While nova-designate integration is not something that we'd use in the future due to neutron <-> designate integration, designate charm currently has nova-designate juju interface and it errors out as there is no such interface included in layer.yaml.

In fact, it was never there because only nova, being a classic charm, uses that relation to do something meaningful.

unit-designate-0: 11:13:04 ERROR unit.designate/0.juju-log Unable to find implementation for relation: provides of nova-designate

provides:
  dnsaas:
    interface: designate
  nova-designate:
    interface: nova-designate

No such interface here (and so such interface in layer.yaml file for designate):
https://github.com/juju/layer-index/tree/master/interfaces

[Dmitrii Shcherbakov (dmitriis)]

On 18.02:

unit-designate-2: 14:58:18 INFO unit.designate/2.juju-log shared-db:73: Reactive main running for hook shared-db-relation-joined
unit-designate-2: 14:58:18 ERROR unit.designate/2.juju-log shared-db:73: Unable to find implementation for relation: provides of nova-designate
unit-designate-bind-0: 14:58:18 DEBUG unit.designate-bind/0.dns-backend-relation-joined active
unit-designate-bind-0: 14:58:18 INFO juju.worker.uniter.operation ran "dns-backend-relation-joined" hook
unit-designate-bind-0: 14:58:18 INFO unit.designate-bind/0.juju-log dns-backend:69: Reactive main running for hook dns-backend-relation-changed
unit-designate-2: 14:58:18 INFO unit.designate/2.juju-log shared-db:73: Invoking reactive handler: hooks/relations/mysql-shared/requires.py:15:joined
unit-designate-2: 14:58:18 INFO unit.designate/2.juju-log shared-db:73: Invoking reactive handler: reactive/designate_handlers.py:60:clear_dns_config_available
unit-designate-2: 14:58:18 INFO unit.designate/2.juju-log shared-db:73: Invoking reactive handler: reactive/designate_handlers.py:224:run_assess_status_on_every_hook
unit-designate-2: 14:58:18 INFO unit.designate/2.juju-log shared-db:73: Invoking reactive handler: reactive/designate_handlers.py:88:setup_database

Likewise, on -next:

 juju upgrade-charm designate --switch cs:~openstack-charmers-next/designate --force-units
Added charm "cs:~openstack-charmers-next/designate-84" to the model.

https://paste.ubuntu.com/p/qnFR48cpw7/

juju status designate
Model Controller Cloud/Region Version SLA
default samaas samaas 2.4-beta3 unsupported

App Version Status Scale Charm Store Rev OS Notes
designate 2.1.0 active 1 designate jujucharms 84 ubuntu

Unit Workload Agent Machine Public address Ports Message
designate/2* active idle 2/lxd/7 10.232.45.150 9001/tcp Unit is ready

Machine State DNS Inst id Series AZ Message
2 started 10.232.24.3 node-0e6956f8-5daf-11e4-b187-525400a6ab07 xenial default Deployed
2/lxd/7 started 10.232.45.150 juju-a06185-2-lxd-7 xenial default Container started

There are a bunch of those errors but eventually designate units get to active/idle:

designate/2* active idle 2/lxd/7 10.232.45.150 9001/tcp Unit is ready

juju debug-log -i designate/2 --replay | grep 'Unable to find implementation for relation: provides of nova-designate'
unit-designate-2: 14:55:02 ERROR unit.designate/2.juju-log Unable to find implementation for relation: provides of nova-designate
unit-designate-2: 14:58:06 ERROR unit.designate/2.juju-log Unable to find implementation for relation: provides of nova-designate
unit-designate-2: 14:58:08 ERROR unit.designate/2.juju-log Unable to find implementation for relation: provides of nova-designate
unit-designate-2: 14:58:11 ERROR unit.designate/2.juju-log Unable to find implementation for relation: provides of nova-designate
unit-designate-2: 14:58:18 ERROR unit.designate/2.juju-log shared-db:73: Unable to find implementation for relation: provides of nova-designat...

[James Page (james-page)]

Errors out is not quite true - reactive logs an ERROR message because it can't find the implmenetation.

[James Page (james-page)]

Lets just drop the provides entry from the designate charm.

[Christian Reis (kiko)]

Not sure about "errors out", but we saw this kill this run: https://solutions.qa.canonical.com/#/qa/testRun/04bd84a2-da33-4244-9afc-a3513e26d442

[Felipe Alencastro (falencastro)]

This error message can be misleading during troubleshooting, had it on our environment as the last message on log and took us a while to figure the issue was elsewhere. I'll submit a patch to remove the provides as James suggested.

21:53:41 ERROR juju-log Unable to find implementation for relation: provides of nova-designate

[Edward Hope-Morley (hopem)]

This is pretty annoying as it spams to the logs:

2021-10-06 15:43:33 ERROR juju-log Unable to find implementation for relation: provides of nova-designate
2021-10-06 15:47:35 ERROR juju-log Unable to find implementation for relation: provides of nova-designate
2021-10-06 15:53:09 ERROR juju-log Unable to find implementation for relation: provides of nova-designate
2021-10-06 15:58:07 ERROR juju-log Unable to find implementation for relation: provides of nova-designate
2021-10-06 16:03:15 ERROR juju-log Unable to find implementation for relation: provides of nova-designate
2021-10-06 16:08:00 ERROR juju-log Unable to find implementation for relation: provides of nova-designate
2021-10-06 16:12:56 ERROR juju-log Unable to find implementation for relation: provides of nova-designate
2021-10-06 16:17:00 ERROR juju-log Unable to find implementation for relation: provides of nova-designate
2021-10-06 16:22:56 ERROR juju-log Unable to find implementation for relation: provides of nova-designate

I will submit a patch to fix this since it seems prev attempts have stalled.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/charm-designate/+/815509

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/charm-designate/+/815509
Committed: https://opendev.org/openstack/charm-designate/commit/bd69d11eb88c08681061117aedc3b40bc77e50a2
Submitter: "Zuul (22348)"
Branch: master

commit bd69d11eb88c08681061117aedc3b40bc77e50a2
Author: Edward Hope-Morley <email address hidden>
Date: Tue Oct 26 15:28:39 2021 +0100

    Drop unused nova-designate provides entry

    Change-Id: I6e80fd3ec115e407891bd589aa76e5b4bf513c46
    Closes-Bug: #1756852

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Alex Kavanagh <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/charm-designate/+/762163
Reason: A more recent review that has landed (I6e80fd3ec115e407891bd589aa76e5b4bf513c46) has solved this issue.