[Bug 1452641] Re: Static Ceph mon IP addresses in connection_info can prevent VM startup

[Maximilian Stinsky]

While we had to migrate/change ceph mon ip's in our openstack
deployment, which is stein at the moment, we got hit by the same
problem.

We fixed it also by manually changing all db entries that required an update. 
Comment https://bugs.launchpad.net/nova/+bug/1452641/comments/23 helped us a ton with creating a sensible database query.

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https://bugs.launchpad.net/bugs/1452641

Title:
  Static Ceph mon IP addresses in connection_info can prevent VM startup

Status in OpenStack Compute (nova):
  In Progress
Status in nova package in Ubuntu:
  Triaged

Bug description:
  The Cinder rbd driver extracts the IP addresses of the Ceph mon servers from the Ceph mon map when the instance/volume connection is established. This info is then stored in nova's block-device-mapping table and is never re-validated down the line. 
  Changing the Ceph mon servers' IP adresses will prevent the instance from booting as the stale connection info will enter the instance's XML. One idea to fix this would be to use the information from ceph.conf, which should be an alias or a loadblancer, directly.

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