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[Augustina Ragwitz <1520022@xxxxxxxxxxxxxxxxxx>]

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** Changed in: nova
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1520022

Title:
  boot from wrong volume

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  In Kilo (and possibly others) there are times when an instance with an
  attached volume is rebooted (or stopped/started) it will boot from vdb
  (the attached volume) instead of vda (the ephemeral boot volume.)

  It doesn't appear to matter whether cinder has the attached volume
  marked bootable or not. Moreover, it doesn't matter if the partition
  is marked bootable or not.

  Details:
  KiloNove, Kilo Cinder, CEPH based ephemeral, Ceph based Cinder.

  Repro:
  1. Create an instance.
  2. Create a volume from an existing instance (snapshot and then volume create).
  3. Attach that volume. It will attach as vdb by default (and that remains consistent, the volume order doesnt' change).
  4. Reboot the instance
  SOMETIMES or more accurately SOME INSTANCES now boot from vdb1 as /. It seems consistent once it happens. The only way I've been able to force booting back to vda is to detach the volume (which I can safely re-attach once the instance is booted.)

  I've found no other work around.

  Real details:
  nova-compute                          1:2015.1.0-0ubuntu1.1~c all                     OpenStack Compute - compute node base
  cinder-common                         1:2015.1.0-0ubuntu1~clo all                     Cinder storage service - common files
  python-cinder                         1:2015.1.0-0ubuntu1~clo all                     Cinder Python libraries
  python-cinderclient                   1:1.1.1-0ubuntu1~cloud0 all                     python bindings to the OpenStack Volume API
  qemu                                  1:2.2+dfsg-5expubuntu9. amd64                   fast processor emulator
  qemu-system                           1:2.2+dfsg-5expubuntu9. amd64                   QEMU full system emulation binaries
  libvirt-bin                           1.2.12-0ubuntu13~cloud0 amd64                   programs for the libvirt library
  libvirt-dev                           1.2.12-0ubuntu13~cloud0 amd64                   development files for the libvirt library
  libvirt0                              1.2.12-0ubuntu13~cloud0 amd64                   library for interfacing with different virtualization systems

  Have not tried to repro in DevStack or with Kilo.2

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