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

[Chase Peterson]

We are also experiencing this issue with Stein.

We are deployed using rook-ceph as our ceph deployment and the monitors
IP address will rotate if any of the monitors are down for more than 10
minutes. Which means anytime we do maintenance on a node running one of
rook-ceph's monitors the ip address will change and we have to go into
the database and update all the mon_hosts for the VMs just so they are
able to start up again.

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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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