https://review.openstack.org/#/c/496729/ is merged, but the commit
targeted a different bug, which is why it didn't close this out. It was
fixed in the 16.0.0 Pike GA.
** Changed in: nova/pike
Assignee: (unassigned) => Matt Riedemann (mriedem)
** Changed in: nova/pike
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1712210
Title:
Live migration does not restrict to the original cell
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) pike series:
Fix Released
Bug description:
Migration operations between multiple cells is not supported in Pike,
but the LiveMigrateTask in conductor does not restrict the
RequestSpec.requested_destination.cell to the original cell that the
instance is in when calling the scheduler's select_destination method.
https://github.com/openstack/nova/blob/16.0.0.0rc1/nova/conductor/tasks/live_migrate.py#L153
And when forcing a host during live migration, it completely bypasses
the scheduler altogether:
https://github.com/openstack/nova/blob/16.0.0.0rc1/nova/conductor/tasks/live_migrate.py#L91
We could fix the former by adding the cell mapping to the
requested_destination like for a cold migration:
https://github.com/openstack/nova/blob/16.0.0.0rc1/nova/conductor/tasks/migrate.py#L51-L65
As for the latter (forced host, bypass the scheduler), we could just
leave it and let it fail - you'd likely get some kind of unhelpful RPC
error since the computes can't talk to each other. Or we could get the
cell mapping for the source node and destination node and verify they
are the same and fail in a clear way if they are not.
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