When using auto discovered hosts the deployment will fail with: "Message: Host 'undercloud-2.osp.rh' is not mapped to any cell, Code: 400" Running as root 'nova-manage cell_v2 discover_hosts --verbose' fixes the issue.
I think we should enable the periodic task for host discovery in the undercloud (we already do it for the overcloud). Moving to instack-undercloud.
master patch proposed
Trying another approach that won't involve a potentially expensive periodic task: https://review.openstack.org/#/c/532495/
After applying the patch https://review.openstack.org/#/c/532495/ the cells issue is gone and there's no need to run 'nova-manage cell_v2 discover_hosts'
I have managed to deploy a overcloud on autodiscovered nodes with no extra steps in OSP12. Had to properly tag the nodes first though
Deployed latest osp 12 2018-03-10.1 Env openstack-tripleo-common-7.6.9-2.el7ost.noarch Based on commet#4&5 and code is in puddle we can move to verify
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:0607