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[OpenStack Infra <1941744@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/horizon/+/857184
Committed: https://opendev.org/openstack/horizon/commit/05dd53a3cf3e1ced265d23d1c02765abd468a483
Submitter: "Zuul (22348)"
Branch:    master

commit 05dd53a3cf3e1ced265d23d1c02765abd468a483
Author: Jan Hartkopf <jhartkopf@xxxxxxxxx>
Date:   Mon Sep 12 15:04:50 2022 +0200

    Fix rescue of volume-based instances
    
    Rescue of volume-based instances is supported since Nova
    microversion 2.87.
    However, Horizon does not use this microversion when requesting
    rescue of any instances, causing a Nova exception for volume-
    based ones.
    
    The patch fixes this by explicitly setting the required
    microversion.
    
    Closes-Bug: #1941744
    Signed-off-by: Jan Hartkopf <jhartkopf@xxxxxxxxx>
    Change-Id: Ic0cdfd326475882f839fd218cd7b4bfa62a2a76b


** Changed in: horizon
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1941744

Title:
  Rescue of volume based instance fails silently due to wrong API
  version

Status in OpenStack Dashboard (Horizon):
  Fix Released

Bug description:
  Even though the feature is noted in the release notes of the Ussuri release (https://docs.openstack.org/releasenotes/nova/ussuri.html#relnotes-21-0-0-stable-ussuri) a volume based instance cannot be "rescued" (https://docs.openstack.org/nova/ussuri/user/rescue.html) via the Horizon Dashboard. 
  After clicking "rescue" the action silently fails and nothing happens.

  I believe this is simply due to the Nova API version used not being recent enough.
  According to https://github.com/openstack/nova/commit/ff3fd846362dfaa7d880dca83f1482b7a8ce80c5 at least version 2.87 is required and I was able to reproduce the issue using the CLI:

  
  1) no version selected 

  # openstack  server rescue --image $IMAGE_ID --password abc123
  $INSTANCE_ID

  Instance $INSTANCE_ID cannot be rescued: Cannot rescue a volume-backed
  instance (HTTP 400) (Request-ID:
  req-8608b9a3-2a10-40ce-a76e-21c93c3bbd8b)


  
  2) selected API version 2.87

  # openstack --os-compute-api-version 2.87 server rescue -image
  $IMAGE_ID --password abc123 $INSTANCE_ID

  
  -> success.

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