** Also affects: nova/ocata
Importance: Undecided
Status: New
** Also affects: nova/pike
Importance: Undecided
Status: New
** Changed in: nova/ocata
Status: New => Confirmed
** Changed in: nova/pike
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1627694
Title:
unshelving an instance doesn't rollback volumes connections on failure
Status in OpenStack Compute (nova):
In Progress
Status in OpenStack Compute (nova) ocata series:
Confirmed
Status in OpenStack Compute (nova) pike series:
Confirmed
Bug description:
When creating and instance and it is being spawned for the first time
fails, the instance's volumes' initialize_connection is being rolled-
back, but when unshelving an shelved-offloaded instance, there's no
rollback in case of failure.
The reason is that when spawning an instance for the first time, nova-compute
calls initialize_connection using the _build_resources() method:
https://github.com/openstack/nova/blob/93e689516da0302b06c2760bb82c5004ae057913/nova/compute/manager.py#L1902
That context-aware method will also take care of rollback in case of a
failure in spawning, and will terminate_connection of the volumes:
https://github.com/openstack/nova/blob/93e689516da0302b06c2760bb82c5004ae057913/nova/compute/manager.py#L2095
But, when unshelving an instance, initialize_connection is not called in a
context aware method, and no rollback in happening when spawning fails.
https://github.com/openstack/nova/blob/93e689516da0302b06c2760bb82c5004ae057913/nova/compute/manager.py#L4330
This makes the volumes stay connected to the node even-though the instance is
shelved-offloaded.
If you want to see this problem, replace the driver.spawn() call with a
"raise Exception", and see the volumes have connection to the node even though
they shouldn't have.
I'm using openstack Liberty, but I can see this problem in current
master (pre-Newton)
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