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

** Also affects: nova/newton
   Importance: Undecided
       Status: New

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  libvirt, rbd imagebackend, disk.rescue not deleted when unrescued

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) newton series:
  In Progress

Bug description:
  Reproduced on juno version (actually tested on a fork from 2014.2.3,
  sorry in advance if invalid but i think the legacy version is also
  concerned by it)

  not tested on younger versions, but looking at the code they seem
  impacted too

  For Rbd imagebackend only, when unrescuing an instance the disk.rescue
  file is actually not deleted on remote storage (only the rbd session
  is destroyed)

  Consequence: when rescuing instance once again, it simply ignores the
  new rescue image and takes the old _disk.rescue image


  1. nova rescue instance

  (take care that you are booted to the vda rescue disk -> when rescuing
  an instance from the same image it was spawned from (case by default),
  since fs uuid is the same, according to your image fstab (if entry
  UUID=) you can actually boot from the image you are actually trying to
  rescue, but this is another matter that concerns template building ->
  see https://bugs.launchpad.net/nova/+bug/1460536)

  edit rescue image disk

  2. nova unrescue instance

  3. nova rescue instance -> you get back the disk.rescue spawned in 1

  if confirmed, fix coming soon

  Concerning fix several possibilities:
  - nova.virt.libvirt.driver :LibvirtDriver-> unrescue method, not deleting the 
correct files
  - nova.virt.libvirt.imagebackend:Rbd -> erase disk.rescue in create image 
method if already existing

  Rebuild not concerned by issue, delete instance correctly deletes
  files on remote storage

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