Well, the post-live-migration action actually needs to update the
scheduler in order to modify its view of the existing instances, hence
why it calls the message queue.
If you restarted the nova-scheduler while the live-migration was in
progress, that's why you got that MQ exception... If you want to do
this, you should have more than one scheduler service.
Putting the bug status into 'Invalid' then.
** Changed in: nova
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1737700
Title:
live-migration error when no exchange 'scheduler_fanout' in vhost
Status in OpenStack Compute (nova):
Invalid
Bug description:
Description
===========
Live-migration operation failed when _post_live_migration function executed
on source compute node.
The failed reason is "no exchange 'scheduler_fanout' in vhost" when
_update_scheduler_instance_info send message to nova-scheduler but
nova-scheduler is restarting.
Steps to reproduce
==================
* I did live-migrate an instance.
* then I did "systemctl restart openstack-nova-scheduler".
* Instance's vm_state is error.
Expected result
===============
Instance's vm_state is active, this migration is successful.
Actual result
=============
Instance's vm_state is error
Environment
===========
1. Exact version of OpenStack you are running. See the following
list for all releases: http://docs.openstack.org/releases/
Pike version
Logs & Configs
==============
2017-12-06 15:13:01.806 28207 WARNING nova.virt.libvirt.driver
[req-dc0c38e4-cd57-496b-8d86-38b839af2ffb 2273fb5ce9e448d4a552665a230a18bb
c6817e1696e84e69ab428b685b4d9fde - default default] [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] Error monitoring migration:
Basic.publish: (404) NOT_FOUND - no exchange 'scheduler_fanout' in vhost '/':
NotFound: Basic.publish: (404) NOT_FOUND - no exchange 'scheduler_fanout' in
vhost '/'
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] Traceback (most recent call last):
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 6811, in
_live_migration
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] finish_event, disk_paths)
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 6722, in
_live_migration_monitor
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] migrate_data)
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 76, in
wrapped
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] function_name, call_dict, binary)
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] self.force_reraise()
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in
force_reraise
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] six.reraise(self.type_, self.value,
self.tb)
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 67, in
wrapped
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] return f(self, context, *args, **kw)
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 220, in
decorated_function
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] kwargs['instance'], e, sys.exc_info())
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] self.force_reraise()
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in
force_reraise
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] six.reraise(self.type_, self.value,
self.tb)
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 208, in
decorated_function
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] return function(self, context, *args,
**kwargs)
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 5822, in
_post_live_migration
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb]
self._update_scheduler_instance_info(ctxt, instance)
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] File
"/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1650, in
_update_scheduler_instance_info
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb] instance)
2017-12-06 15:13:01.806 28207 ERROR nova.virt.libvirt.driver [instance:
14a9e429-00b8-4093-93f4-dd9445be5dfb]
233 instance-00000173 running
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