kolla-ansible/releasenotes/notes/stop-duplicating-nova-cells...

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While Kolla Ansible now avoids duplicating Nova cells when messaging or
database connection information are changed, operators of existing
deployments should perform a manual cleanup of duplicate cells using the
``nova-manage cell_v2`` command from a container running the ``nova_api``
image, leaving only two cells, one named ``cell0`` and another one with the
right connection information.