Comment 0 for bug 1835002

Error when booting instance: Host 'xyz' is not mapped to any cell

Example log with failure: http://logs.openstack.org/63/667363/11/check/kolla-ansible-centos-source-upgrade-ceph-1/640d468/primary/logs/ansible/test-openstack

Affected branches: all supported (incl. master)

Problem analysis:

Nova deployment does not wait for computes to be up before discovery.
See: https://opendev.org/openstack/kolla-ansible/src/tag/8.0.0.0rc1/ansible/roles/nova/tasks/discover_computes.yml#L22

The problem has been exacerbated by merging fix for nova race condition:
https://bugs.launchpad.net/kolla-ansible/+bug/1832987
https://review.opendev.org/665554

There are two proposed fix approaches (both WIP):
(yoctozepto) https://review.opendev.org/668553
(mgoddard) https://review.opendev.org/668623

We should care for ironic too.