[Bug 1439371] Re: [SRU] Volume creation from image fails for UEC and Glance API version 2

[Seyeong Kim]

this is additional to https://bugs.launchpad.net/cinder/+bug/1323660,
for compatibility. verified


** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/1439371

Title:
  [SRU] Volume creation from image fails for UEC and Glance API version
  2

Status in Cinder:
  Fix Released
Status in Cinder kilo series:
  Fix Released
Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive icehouse series:
  In Progress
Status in cinder package in Ubuntu:
  Invalid
Status in cinder source package in Trusty:
  Fix Committed

Bug description:
  [Description]
  [Test Case]
  When creating a volume from a glance UEC image, the RBD driver fails to combine the rootfs, kernel, and ramdisk into a single volume suitable for booting an instance.  Instead, only the rootfs is written to the volume, which is empty.  This causes nova's boot-from-volume operation to fail if the volume is ceph-backed and the image is of type UEC.

  By contrast, the same operation on an LVM volume yields a volume that
  contains all the necessary pieces to boot an instance.

  This is also likely the reason for recent ceph CI job failures in
  test_volume_boot_pattern, as tempest executes this exact set of
  operations.

  [Regression Potential]
  Regression potential is low. Patch is cherry-picked from upstream stable/liberty branch without any changes.

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