nova/releasenotes/notes/migration-tool-to-populate-inst.avz-29fed2fe57a9764d.yaml
Surya Seetharaman 6b4c38c041 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
2018-05-17 13:24:08 -04:00

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YAML

---
upgrade:
- |
A new online data migration has been added to populate missing
instance.availability_zone values for instances older than Pike whose
availability_zone was not specified during boot time. This can be run
during the normal ``nova-manage db online_data_migrations`` routine.
This fixes `Bug 1768876`_
.. _Bug 1768876: https://bugs.launchpad.net/nova/+bug/1768876