There is a blueprint for the fix for this:
https://blueprints.launchpad.net/nova/+spec/allow-image-to-be-specified-during-rescue
** Changed in: nova
Status: Triaged => Invalid
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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):
Invalid
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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