yahoo-eng-team team mailing list archive

[Lee Yarwood <1787588@xxxxxxxxxxxxxxxxxx>]

Moving between computes with different [libvirt]/images_types settings
using live migration like this isn't supported. Additionally I don't
believe cold migration between such computes would work either.

You should however be able to move these instances by creating a
snapshot and recreating the instance on the new computes that are
hopefully in a host aggregate separate to the original computes?

I'm going to mark this as opinion and wishlist to see if anyone thinks
it's worth fixing this.

** Changed in: nova
       Status: New => Opinion

** Tags added: libvirt

** Summary changed:

- Live Migration from Local Storage to RBD: rbd import: Invalid Spec 
+ Live Migration [libvirt]/images_type=qcow2 to [libvirt]/images_type=rbd fails

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https://bugs.launchpad.net/bugs/1787588

Title:
  Live Migration [libvirt]/images_type=qcow2 to
  [libvirt]/images_type=rbd fails

Status in OpenStack Compute (nova):
  Opinion

Bug description:
  Description
  ===========
  Trying to migrate an instance from local storage to a hypervisor that is backed by RBD results in the error: invalid spec 'b05eafa0-e7da-4637-a47c-cddca5cc381c_/var/lib/nova/instances/b05eafa0-e7da-4637-a
  47c-cddca5cc381c/disk'

  Steps to reproduce
  ==================
  * Create an instance from an image that is not on a rbd backend on a node that is configured to store the instance disk locally (as qcow2)
  * Live-Migrate the instance to a node that is configured to use rbd as backend.
  openstack server migrate --live compute-rbd --block-migration UUID

  Expected result
  ===============
  Migration completes successfully

  Actual result
  =============
  rbd import command of base image fails with: Stderr: u"rbd: --pool is deprecated for import, use --dest-pool\nrbd: invalid spec 'b05eafa0-e7da-4637-a47c-cddca5cc381c_/var/lib/nova/instances/b05eafa0-e7da-4637-a
  47c-cddca5cc381c/disk'\n"

  The command run is: rbd import --pool vms
  /var/lib/nova/instances/_base/4d3facc86af22a33b3ca0eb95c1953c76b72bfaa
  b05eafa0-e7da-4637-a47c-
  cddca5cc381c_/var/lib/nova/instances/b05eafa0-e7da-4637-a47c-
  cddca5cc381c/disk --image-format=2 --id cinder --conf
  /etc/ceph/ceph.conf

  A trace is attached below.

  Environment
  ===========
  Nova 10.1.0
  CentOS 7.5
  Ceph 12.2

  Is there any way to migrate a local instance to a rbd backend or is
  this not supported?

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