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[Bug 1627005] [NEW] Changing use_cow_images breaks existing instances

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Josias Montag <josias@xxxxxxxxxxx>
Date: Fri, 23 Sep 2016 12:34:17 -0000
Reply-to: Bug 1627005 <1627005@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

Summary:
Changing use_cow_images from false to true breaks all existing instances with raw images.

Env:
Nova version 3.3.1, Fuel 9.0.

Reproduce steps:
1. Set use_cow_images=false in nova.conf
2. Create and start an instance using a raw image
3. Set use_cow_images=true in nova.conf
4. Restart the instance

Expect result:
The existing instance restarts and continues to work.

Actual result:
Restarting the instances fails with "Image is not in qcow2 format". Full log:

oslo_messaging.rpc.dispatcher [req-23c83b76-ee13-44e7-9b92-c7ac20f369cc 91c65783f69e4322992d4b7f86172fab 19e9d9a752d14ec8a20a0d8be1681bdd - - -] Exception during message handling: internal error: process exited while connecting to monitor: 2016-09-23T11:56:59.855117Z qemu-system-x86_64: -drive file=/var/lib/nova/instances/86682c9d-628a-4ab6-9836-1ab3bc5a493b/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: Image is not in qcow2 format
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher Traceback (most recent call last):
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 138, in _dispatch_and_reply
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     incoming.message))
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 185, in _dispatch
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 127, in _do_dispatch
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 110, in wrapped
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     payload)
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     self.force_reraise()
2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_utils/ex[....]

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1627005

Title:
  Changing use_cow_images breaks existing instances

Status in OpenStack Compute (nova):
  New

Bug description:
  Summary:
  Changing use_cow_images from false to true breaks all existing instances with raw images.

  Env:
  Nova version 3.3.1, Fuel 9.0.

  Reproduce steps:
  1. Set use_cow_images=false in nova.conf
  2. Create and start an instance using a raw image
  3. Set use_cow_images=true in nova.conf
  4. Restart the instance

  Expect result:
  The existing instance restarts and continues to work.

  Actual result:
  Restarting the instances fails with "Image is not in qcow2 format". Full log:

  oslo_messaging.rpc.dispatcher [req-23c83b76-ee13-44e7-9b92-c7ac20f369cc 91c65783f69e4322992d4b7f86172fab 19e9d9a752d14ec8a20a0d8be1681bdd - - -] Exception during message handling: internal error: process exited while connecting to monitor: 2016-09-23T11:56:59.855117Z qemu-system-x86_64: -drive file=/var/lib/nova/instances/86682c9d-628a-4ab6-9836-1ab3bc5a493b/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: Image is not in qcow2 format
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher Traceback (most recent call last):
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 138, in _dispatch_and_reply
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     incoming.message))
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 185, in _dispatch
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 127, in _do_dispatch
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 110, in wrapped
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     payload)
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher     self.force_reraise()
  2016-09-23 11:57:01.145 30847 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_utils/ex[....]

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Follow ups

[Bug 1627005] Re: Changing use_cow_images breaks existing instances
From: Sean Dague, 2016-12-09