[Bug 1831181] Re: [aodh.notifier] Not setting user_domain_id raises keystone error: The resource could not be found.

[OpenStack Infra]

Reviewed:  https://review.opendev.org/663133
Committed: https://git.openstack.org/cgit/openstack/charm-aodh/commit/?id=58b8feeece1c05b1fc71097cac932b92ec3bf00a
Submitter: Zuul
Branch:    master

commit 58b8feeece1c05b1fc71097cac932b92ec3bf00a
Author: Jorge Niedbalski <jorge.niedbalski at canonical.com>
Date:   Tue Jun 4 15:58:15 2019 -0400

    Add user_domain_id to service_credentials.
    
    Keystone authentication might use user_domain_id
    as a fallback if no user_domain_name is provided.
    
    Change-Id: I96008794a2f8cce9ee291b2e1d967deb281d988e
    Closes-Bug: #1831181
    Signed-off-by: Jorge Niedbalski <jorge.niedbalski at canonical.com>


** Changed in: charm-aodh
       Status: In Progress => Fix Committed

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Title:
  [aodh.notifier] Not setting user_domain_id raises keystone error: The
  resource could not be found.

Status in Aodh:
  New
Status in OpenStack AODH Charm:
  Fix Committed
Status in charm-interface-keystone:
  Fix Released
Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive mitaka series:
  Triaged
Status in Ubuntu Cloud Archive ocata series:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in Ubuntu Cloud Archive rocky series:
  Triaged
Status in Ubuntu Cloud Archive stein series:
  Triaged
Status in Ubuntu Cloud Archive train series:
  Triaged
Status in aodh package in Ubuntu:
  Triaged
Status in aodh source package in Xenial:
  Triaged
Status in aodh source package in Bionic:
  Triaged
Status in aodh source package in Cosmic:
  Triaged
Status in aodh source package in Disco:
  Triaged
Status in aodh source package in Eoan:
  Triaged

Bug description:
  [Environment]

  Xenial/Queens

  [Description]

  If no user_domain_id is provided then, the following exception will be raised by the
  aodh-notifier component:

  $ openstack alarm-history show 1424b6fb-1d9d-4d69-b00a-ad455aad0ecb

  ==> /var/log/aodh/aodh-notifier.log <==
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier   File "/usr/lib/python2.7/dist-packages/keystoneauth1/identity/generic/base.py", line 201, in get_auth_ref
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier     return self._plugin.get_auth_ref(session, **kwargs)
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier   File "/usr/lib/python2.7/dist-packages/keystoneauth1/identity/v2.py", line 63, in get_auth_ref
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier     authenticated=False, log=False)
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier   File "/usr/lib/python2.7/dist-packages/keystoneauth1/session.py", line 848, in post
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier     return self.request(url, 'POST', **kwargs)
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier   File "/usr/lib/python2.7/dist-packages/keystoneauth1/session.py", line 737, in request
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier     raise exceptions.from_response(resp, method, url)
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier NotFound: (http://10.5.0.36:35357/v2.0/tokens): The resource could not be found. (HTTP 404) (Request-ID: req-50d54903-d2af-4fd1-be68-a92498d91b85)
  2019-05-31 02:07:26.663 15274 ERROR aodh.notifier 

  Domain configuration for the aodh service is as follows:

  root at juju-95497c-controller-1:/home/ubuntu# grep domain /etc/aodh/aodh.conf 
  gnocchi_external_domain_name = service_domain
  project_domain_name = service_domain
  user_domain_name = service_domain

  ### Explanation

  The following line https://github.com/openstack/aodh/blob/master/aodh/keystone_client.py#L51 
  enforces the existence of the user_domain_id for getting the authenticated keystone session.

  [Proposed Solution]

  * Use user_domain_name as a fallback if no user_domain_id is provided.
  * The charm templates should provide only user_domain_id if provided orelse
  fallback to user_domain_name.

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