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[Bug 1654504] [NEW] Resize instance which is booted from volume failed

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Tao Li <litao3721@xxxxxxx>
Date: Fri, 06 Jan 2017 08:06:38 -0000
Reply-to: Bug 1654504 <1654504@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

Description
===========

When instance was booted from volume, but the driver will consider it booted from image in resize
scenario. This bug is introduced by the bug path:  bug #1587802. 

Steps to reproduce
==================

1. Booting an instance from volume with flavor m1.small。
2. Resize the instance to m1.tiny。


Expected result
===============
Resize the instance succefully.

Actual result
=============
Exception was raised as follows.

2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 3964, in _finish_resize
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     block_device_info, power_on)
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 7417, in finish_migration
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     fallback_from_host=migration.source_compute)
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 3180, in _create_image
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     backend.create_snap(libvirt_utils.RESIZE_SNAPSHOT_NAME)
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/imagebackend.py", line 944, in create_snap
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     return self.driver.create_snap(self.rbd_name, name)
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/storage/rbd_utils.py", line 381, in create_snap
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     with RBDVolumeProxy(self, str(volume), pool=pool) as vol:
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/storage/rbd_utils.py", line 65, in __init__
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     driver._disconnect_from_rados(client, ioctx)
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     self.force_reraise()
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     six.reraise(self.type_, self.value, self.tb)
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/storage/rbd_utils.py", line 61, in __init__
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     read_only=read_only)
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/rbd.py", line 374, in __init__
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     raise make_ex(ret, 'error opening image %s at snapshot %s' % (name, snapshot))
2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc] ImageNotFound: error opening image 496d2d53-5a57-44bf-93c4-26baec9a9bbc_disk at snapshot None

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1654504

Title:
  Resize instance which is booted from volume failed

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========

  When instance was booted from volume, but the driver will consider it booted from image in resize
  scenario. This bug is introduced by the bug path:  bug #1587802. 

  Steps to reproduce
  ==================

  1. Booting an instance from volume with flavor m1.small。
  2. Resize the instance to m1.tiny。

  
  Expected result
  ===============
  Resize the instance succefully.

  Actual result
  =============
  Exception was raised as follows.

  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 3964, in _finish_resize
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     block_device_info, power_on)
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 7417, in finish_migration
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     fallback_from_host=migration.source_compute)
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 3180, in _create_image
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     backend.create_snap(libvirt_utils.RESIZE_SNAPSHOT_NAME)
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/imagebackend.py", line 944, in create_snap
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     return self.driver.create_snap(self.rbd_name, name)
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/storage/rbd_utils.py", line 381, in create_snap
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     with RBDVolumeProxy(self, str(volume), pool=pool) as vol:
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/storage/rbd_utils.py", line 65, in __init__
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     driver._disconnect_from_rados(client, ioctx)
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     self.force_reraise()
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     six.reraise(self.type_, self.value, self.tb)
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/storage/rbd_utils.py", line 61, in __init__
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     read_only=read_only)
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]   File "/usr/lib/python2.7/site-packages/rbd.py", line 374, in __init__
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc]     raise make_ex(ret, 'error opening image %s at snapshot %s' % (name, snapshot))
  2017-01-06 15:30:44.200 7947 ERROR nova.compute.manager [instance: 496d2d53-5a57-44bf-93c4-26baec9a9bbc] ImageNotFound: error opening image 496d2d53-5a57-44bf-93c4-26baec9a9bbc_disk at snapshot None

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Follow ups

[Bug 1654504] Re: Resize instance which is booted from volume failed
From: Tao Li, 2017-01-12