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[Bence Romsics <2096757@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I opened this bug to track the following failure seen in various gate
jobs:

test:
tempest.serial_tests.scenario.test_aggregates_basic_ops.TestAggregatesBasicOps

error message:
tempest.lib.exceptions.Conflict: Conflict with state of target resource
Details: {'code': 409, 'message': "Cannot add host to aggregate 19. Reason: The host cannot be added to the aggregate as the availability zone of the host would change from 'None' to 'foo_zone' but the host already has 2 instance(s). Changing the AZ of an existing instance is not supported by this action. Move the instances away from this host then try again. If you need to move the instances between AZs then you can use shelve_offload and unshelve to achieve this.."}

I have seen this first in a neutron-ovs-tempest-multinode-full job run,
however according to gate logsearch it happens in other jobs as well:

devstack-plugin-nfs-tempest-full-fips
devstack-plugin-nfs-tempest-full
neutron-ovs-tempest-multinode-full
neutron-ovs-tempest-dvr-ha-multinode-full

example logs:
https://1f60b37dcbd00092b7dc-4a63bffb654cd83f9f61f31a50d77a27.ssl.cf5.rackcdn.com/939786/2/check/neutron-ovs-tempest-multinode-full/51cf85f/testr_results.html

logsearch link:
https://opensearch.logs.openstack.org/_dashboards/app/data-explorer/discover/#?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:now-2w,to:now))&_a=(discover:(columns:!(message,log_url,build_name,project,filename),interval:auto,sort:!()),metadata:(indexPattern:'94869730-aea8-11ec-9e6a-83741af3fdcd',view:discover))&_q=(filters:!(),query:(language:lucene,query:'message:%22The%20host%20cannot%20be%20added%20to%20the%20aggregate%20as%20the%20availability%20zone%22'))

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: gate-failure

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https://bugs.launchpad.net/bugs/2096757

Title:
  gate: Cannot add host to aggregate ... Reason: The host cannot be
  added to the aggregate as the availability zone of the host would
  change from \'None\' to \'foo_zone\' but ...

Status in OpenStack Compute (nova):
  New

Bug description:
  I opened this bug to track the following failure seen in various gate
  jobs:

  test:
  tempest.serial_tests.scenario.test_aggregates_basic_ops.TestAggregatesBasicOps

  error message:
  tempest.lib.exceptions.Conflict: Conflict with state of target resource
  Details: {'code': 409, 'message': "Cannot add host to aggregate 19. Reason: The host cannot be added to the aggregate as the availability zone of the host would change from 'None' to 'foo_zone' but the host already has 2 instance(s). Changing the AZ of an existing instance is not supported by this action. Move the instances away from this host then try again. If you need to move the instances between AZs then you can use shelve_offload and unshelve to achieve this.."}

  I have seen this first in a neutron-ovs-tempest-multinode-full job
  run, however according to gate logsearch it happens in other jobs as
  well:

  devstack-plugin-nfs-tempest-full-fips
  devstack-plugin-nfs-tempest-full
  neutron-ovs-tempest-multinode-full
  neutron-ovs-tempest-dvr-ha-multinode-full

  example logs:
  https://1f60b37dcbd00092b7dc-4a63bffb654cd83f9f61f31a50d77a27.ssl.cf5.rackcdn.com/939786/2/check/neutron-ovs-tempest-multinode-full/51cf85f/testr_results.html

  logsearch link:
  https://opensearch.logs.openstack.org/_dashboards/app/data-explorer/discover/#?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:now-2w,to:now))&_a=(discover:(columns:!(message,log_url,build_name,project,filename),interval:auto,sort:!()),metadata:(indexPattern:'94869730-aea8-11ec-9e6a-83741af3fdcd',view:discover))&_q=(filters:!(),query:(language:lucene,query:'message:%22The%20host%20cannot%20be%20added%20to%20the%20aggregate%20as%20the%20availability%20zone%22'))

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