[Bug 1457517] Re: Unable to boot from volume when flavor disk too small

[Brian Murray]

Hello Favyen, or anyone else affected,

Accepted nova into vivid-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/nova/1:2015.1.1-0ubuntu2 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: nova (Ubuntu Vivid)
       Status: New => Fix Committed

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1457517

Title:
  Unable to boot from volume when flavor disk too small

Status in OpenStack Compute (nova):
  Fix Released
Status in nova package in Ubuntu:
  Fix Released
Status in nova source package in Vivid:
  Fix Committed

Bug description:
  [Impact]

   * Without the backport, booting from volume requires flavor disk size
  larger than volume size, which is wrong. This patch skips flavor disk
  size checking when booting from volume.

  [Test Case]

   * 1. create a bootable volume
     2. boot from this bootable volume with a flavor that has disk size smaller than the volume size
     3. error should be reported complaining disk size too small
     4. apply this patch
     5. boot from that bootable volume with a flavor that has disk size smaller than the volume size again
     6. boot should succeed

  [Regression Potential]

   * none

  
  Version: 1:2015.1.0-0ubuntu1~cloud0 on Ubuntu 14.04

  I attempt to boot an instance from a volume:

  nova boot --nic net-id=[NET ID] --flavor v.512mb --block-device
  source=volume,dest=volume,id=[VOLUME
  ID],bus=virtio,device=vda,bootindex=0,shutdown=preserve vm

  This results in nova-api raising a FlavorDiskTooSmall exception in the
  "_check_requested_image" function in compute/api.py. However,
  according to [1], the root disk limit should not apply to volumes.

  [1] http://docs.openstack.org/admin-guide-cloud/content/customize-
  flavors.html

  Log (first line is debug output I added showing that it's looking at
  the image that the volume was created from):

  2015-05-21 10:28:00.586 25835 INFO nova.compute.api [req-1fb882c7-07ae-4c2b-86bd-3d174602d0ae f438b80d215c42efb7508c59dc80940c 8341c85ad9ae49408fa25074adba0480 - - -] image: {'min_disk': 0, 'status': 'active', 'min_ram': 0, 'properties': {u'container_format': u'bare', u'min_ram': u'0', u'disk_format': u'qcow2', u'image_name': u'Ubuntu 14.04 64-bit', u'image_id': u'cf0dffef-30ef-4032-add0-516e88048d85', u'libvirt_cpu_mode': u'host-passthrough', u'checksum': u'76a965427d2866f006ddd2aac66ed5b9', u'min_disk': u'0', u'size': u'255524864'}, 'size': 21474836480}
  2015-05-21 10:28:00.587 25835 INFO nova.api.openstack.wsgi [req-1fb882c7-07ae-4c2b-86bd-3d174602d0ae f438b80d215c42efb7508c59dc80940c 8341c85ad9ae49408fa25074adba0480 - - -] HTTP exception thrown: Flavor's disk is too small for requested image.

  Temporary solution: I have special flavor for volume-backed instances so I just set the root disk on those to 0, but this doesn't work if volume are used on other flavors.
  Reproduce: create flavor with 1 GB root disk size, then try to boot an instance from a volume created from an image that is larger than 1 GB.

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