** Changed in: nova/kilo
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1427056
Title:
shelved_image_id is deleted before completing unshelving instance on
compute node
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) kilo series:
Fix Released
Bug description:
Steps to reproduce:
1. Boot an instance from image.
2. Call Shelve instance, instance becomes SHELVED_OFFLOADED or SHELVED state
depending on 'shelved_offload_time' configured in nova.conf.
3. Call unshelve instance.
For shelved_offload_time >= 0:
3.1 nova-conductor calls RPC.Cast to nova-compute
If some failure happens in nova-compute. e.g. "Instance failed to spawn"
error from libvirt
3.2 nova-conductor deletes instance_system_metadata.shelved_image_id after
RPC.cast for unshelving the instance.
3.3 Instance becomes SHELVED_OFFLOADED again by revert_task_state, but
instance_system_metadata.shelved_image_id is already deleted for this instance
For shelved_offload_time = -1:
3.1 nova-conductor calls RPC.Cast to nova-compute
If some failure happens in nova-compute. e.g. "InstanceNotFound" error
while starting the instance.
3.2 nova-conductor deletes snapshot and
instance_system_metadata.shelved_image_id after RPC.cast to start the instance.
3.3 Instance becomes SHELVED again by revert_task_state, but snapshot and
instance_system_metadata.shelved_image_id is already deleted for this instance
Problems:
1. As there is no shelved_image_id, during unshelving the instance again, it
gives error while getting image-meta in
libvirt driver and instance remains in SHELVED_OFFLOADED state.
2. As there is no shelved_image_id, deleting the instance will try to
delete "image_id=None" image from glance, but 404 error will be
returned from glance, instance will be successfully deleted, and
shelved image remains.
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