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[Sean Dague <sean@xxxxxxxxx>]

** Changed in: nova/mitaka
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1582684

Title:
  nova kilo->liberty ceph configdrive upgrade fails

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) liberty series:
  Fix Released
Status in OpenStack Compute (nova) mitaka series:
  Fix Released

Bug description:
  Using CEPH RBD as our ephemeral drive led to an issue when upgrading
  from Kilo to Liberty. Our environment has "force_config_drive = True".

  In Icehouse, Juno, and Kilo, this uses an ISO 9660 image created in
  /var/lib/nova/instances/$UUID/disk.config

  However, in Liberty, if using CEPH RBD for ephemeral, there is a
  switch to putting this in rbe like this:

  rbd:instances/${UUID}_disk.config

  While this works GREAT for new VMs, it is problematic with existing
  VMs as not all transition states were considered. In particular, if
  you do a

  nova stop $UUID

  followed by a

  nova start $UUID

  you will find your instance still in the stopped state. There is
  something in the start code that ASSUMES that the new rbd format will
  be in place (but it doesn't actually create it.)

  There is a work around if you find instances in that state, simply
  cold migrate them with

  nova migrate $UUID

  which redoes the config.drive plumbing and creates the
  rbd:instances/${UUID}_disk.config

  Our permanent work around has been to prepopulate the rbd via a script
  though getting this bug fixed would be much better.

  Liberty is a stable release and this is a loss of service type of bug
  so should get fixed. Not clear if this is also an issue (likely so) in
  Mitaka/Newton as we haven't got an environment yet to test it, but
  presumably with long running VMs from early config drive, it would
  also exist in Mitaka.

  Specifics:
  Liberty Nova
  nova:12.0.2-38-g7bc3355.13.1b76006

  CEPH:
  0.94.6-1trusty

  Host OS:
  Ubuntu Trusty

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