Talked about this at the queens ptg, notes are in here:
https://etherpad.openstack.org/p/cinder-ptg-queens
** Also affects: nova
Importance: Undecided
Status: New
** Changed in: nova
Status: New => Confirmed
** Changed in: nova
Importance: Undecided => Medium
** No longer affects: cinder
** Tags removed: drivers
** Tags added: volumes
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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):
Confirmed
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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