devstack need support the configuration of nova cell

[Dave Chen]

Nova has a hard requirement of nova cell configuration since "O" stable release, but this neither mentioned in all-in-one [0] installation guide nor in multi-node [1] installation guide, haven't inspected into the source of script but no instance can be launched if setup the cluster based on these guide. Here is part of exception message when I tried to launch an instance.

Error: Failed to perform requested operation on instance "wtf-2", the instance has an error status: Please try again later [Error: Host 'ceph-dev' is not mapped to any cell].

Obviously, nova cell should be supported by devstack.

[0] https://docs.openstack.org/developer/devstack/guides/single-machine.html
[1] https://docs.openstack.org/developer/devstack/guides/multinode-lab.html

[Rikimaru Honjo (honjo-rikimaru-c6)]

I am suffering from this problem, too.
I did multi-node installation, but nova-compute of compute node wasn't mapped to cell.

[Andia (wangyuwei)]

use nova_api database, than update host field in host_mapping table to correct hostname. It works fine for me.

[Matt Riedemann (mriedem)]

For single node the cell stuff all happens automatically within devstack, and has been since Ocata, so that shouldn't be a problem.

I've duplicated this against bug 1688397 which was a docs issue for the multinode setup scenario and the fact you need to discover the child compute node(s) once those are stacked.