Another note for my QUEENS recreate, after restarting nova-compute process, I tried to boot an instance and it went to ERROR state with:
{"message": "Host 'ubuntu-xenial' is not mapped to any cell", "code": 400, "created": "2019-11-22T04:10:57Z"}
So then I did:
$ nova-manage cell_v2 discover_hosts
and tried to boot an instance again, and it worked.
Another note for my QUEENS recreate, after restarting nova-compute process, I tried to boot an instance and it went to ERROR state with:
{"message": "Host 'ubuntu-xenial' is not mapped to any cell", "code": 400, "created": "2019-11- 22T04:10: 57Z"}
So then I did:
$ nova-manage cell_v2 discover_hosts
and tried to boot an instance again, and it worked.