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

[Seyeong Kim]

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

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

Title:
  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:
  New

Bug description:
  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.

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