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[Bug 1188141] Re: Deleting images breaks rescue mode for servers built from said images

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: John Garbutt <john@xxxxxxxxxxxxxxx>
Date: Mon, 21 Oct 2013 09:58:45 -0000
Reply-to: Bug 1188141 <1188141@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

This is still happening, lets bring this back

** Changed in: nova
       Status: Invalid => Triaged

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https://bugs.launchpad.net/bugs/1188141

Title:
  Deleting images breaks rescue mode for servers built from said images

Status in OpenStack Compute (Nova):
  Triaged

Bug description:
  Rescue image is considered to be the image from which the instance is
  built from. If that image is deleted, the rescue fails

  Consider this scenario,
  The customer has a snapshot of an instance. He build another instance from the snapshot and deletes the snapshot. Now the customer tries to rescue the instance that was built from the snapshot, it fails because the rescue image is not available.

  Possible solutions -

  1. Recursively find the image that's available:
  The system_metadata of an instance has the "image_base_image_ref" as property set on it. This points to image from which it was built.
  Image has instance_uuid, if it's a snapshot. 
  We'll have to recursively find the base_install and use it as rescue image if the snapshot is deleted.

  2. Store the corresponding original image reference in all images. So
  that it's easier to find the rescue image.

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