** Changed in: nova
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1488435
Title:
Resources on destination node doesn't cleanup if live-migration fails
Status in OpenStack Compute (nova):
Fix Released
Bug description:
I've deployed multinode devstack environment and tried to live-migrate
volume-backed instance,
live-migration fails during copying of glance image to destination. When it
happens nova leaves destination host in inconsistent state, and attempt to run
live-migration again fails.
Here is small investigation of a problem:
nova creates instance directory on target compute node:
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L6152
in second run it fail here, because dest node wasn't properly cleanedup:
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L6148
Also it's really strange, that when pre_live_migration on dest node fails,
flow returns to source which decide is that really required to clean_up
destination or not. It will be more clearer to wrap pre_live_migration with
try/catch and rollback it before response to source node:
https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L4962-L4984
Devstack nova version:
stack@node1:/opt/stack/nova$ git log -1
commit a71912ef463761187ef785118fbb0e51a5e91ba3
Merge: ea4e95e 6b2d616
Author: Jenkins <[email protected]>
Date: Mon Aug 24 16:07:32 2015 +0000
Merge "Fixed indentation"
Controller with compute node nova.conf:
http://paste.openstack.org/show/426934/
Compute only nova.conf:
http://paste.openstack.org/show/426936/
*UPDATE*
root cause of the problem:
rollback_live_migration_at_destination
do several things:
one of them is deallocation nova-network resources over call of
setup_networks_on_host with teardown=True. If this call fails no
clean-up on driver side happens.
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