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[OpenStack Infra <1768876@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/567878
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=6b4c38c04177ff194d05368cd4aff69958075167
Submitter: Zuul
Branch:    master

commit 6b4c38c04177ff194d05368cd4aff69958075167
Author: Surya Seetharaman <suryaseetharaman.9@xxxxxxxxx>
Date:   Fri May 11 17:12:34 2018 +0200

    Metadata-API fails to retrieve avz for instances created before Pike
    
    In Pike (through change: I8d426f2635232ffc4b510548a905794ca88d7f99)
    we started setting instance.avilability_zone during schedule time by
    calculating the avz of the host into which the instance was scheduled
    into. After this change was introduced, the metadata request for the avz
    on the instance (through change: I73c3b10e52ab4cfda9dacc0c0ba92d1fcb60bcc9)
    started using instance.get(availability_zone) instead of doing the upcall.
    However this would return None for instances older than Pike whose
    availability_zone was not mentioned during boot time as it would be set to
    CONF.default_schedule_zone whose default value is None.
    
    This patch adds an online_migration tool to populate missing
    instance.availability_zone values.
    
    Change-Id: I2a1d81bfeb1ea006c16d8f403e045e9acedcbe57
    Closes-Bug: #1768876


** Changed in: nova
       Status: In Progress => Fix Released

** Changed in: nova/pike
       Status: Triaged => In Progress

** Changed in: nova/pike
     Assignee: (unassigned) => Matt Riedemann (mriedem)

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https://bugs.launchpad.net/bugs/1768876

Title:
  metadata-api fails to get availability zone for instances created
  before pike

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) pike series:
  In Progress
Status in OpenStack Compute (nova) queens series:
  In Progress

Bug description:
  Can't get AVZ for old instances:

  curl http://169.254.169.254/latest/meta-data/placement/availability-zone 
  None#

  This is because the upcall to the nova_api DB was removed in the commit: 9f7bac2
  and old instances may haven't the AVZ defined.
  Previously, the AVZ in the instance was only set if explicitly defined by the user.

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