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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Public bug reported:

This was mentioned in bug 1702932 but is a separate issue.

When we create a server it gets put in a specific cell and it's
instance_mappings record in the API DB is set to map that instance to
that cell.

If we migrate (cold, resize or live) the instance, the conductor task
manager restrict the instance move operation to the same cell:

https://github.com/openstack/nova/blob/56cd608d3a199dcb02ac2ae071ff3057241259da/nova/conductor/tasks/migrate.py#L63-L66

However, when we unshelve an offloaded server, there is nothing
restricting the scheduler from picking a host in another cell:

https://github.com/openstack/nova/blob/56cd608d3a199dcb02ac2ae071ff3057241259da/nova/conductor/manager.py#L673-L700

** Affects: nova
     Importance: High
         Status: Confirmed


** Tags: cells shelve

** Changed in: nova
       Status: New => Confirmed

** Changed in: nova
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1702935

Title:
  Unshelving an offloaded server does not restrict to the original cell

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  This was mentioned in bug 1702932 but is a separate issue.

  When we create a server it gets put in a specific cell and it's
  instance_mappings record in the API DB is set to map that instance to
  that cell.

  If we migrate (cold, resize or live) the instance, the conductor task
  manager restrict the instance move operation to the same cell:

  https://github.com/openstack/nova/blob/56cd608d3a199dcb02ac2ae071ff3057241259da/nova/conductor/tasks/migrate.py#L63-L66

  However, when we unshelve an offloaded server, there is nothing
  restricting the scheduler from picking a host in another cell:

  https://github.com/openstack/nova/blob/56cd608d3a199dcb02ac2ae071ff3057241259da/nova/conductor/manager.py#L673-L700

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