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Connection went down, not sure about the cause, no error from
server side. Then successful reconnection followed by nack.
Enabled debug in logging for rabbitmq, but restart rabbitmq
cluster brought everything back to normal. Will keep logging
level on debug and wait for the issue happens again.

Thanks!
Tony
> -----Original Message-----
> From: Eugen Block <eblock at nde.ag>
> Sent: Thursday, December 10, 2020 2:11 AM
> To: openstack-discuss at lists.openstack.org
> Subject: Re: [nova-compute] Failed to publish message to topic
> 'scheduler_fanout'
> 
> Hi,
> 
> apparently nova can't reach rabbitmq, I would check rabbit logs and
> 'rabbitmqctl cluster_status'.
> 
> Regards,
> Eugen
> 
> 
> Zitat von Tony Liu <tonyliu0592 at hotmail.com>:
> 
> > Hi,
> >
> > With Ussuri, failed to launch VM and saw such error from nova-compute.
> > Didn't see any error in nova-api, nova-conductor and nova-scheduler.
> > Did some search and not found any similar cases.
> > Wondering anyone has ever hit this issue?
> > =================================================
> > 2020-12-09 13:24:29.333 8 ERROR oslo.messaging._drivers.impl_rabbit
> > [req-4226ac03-a5b7-446a-a74b-2785f9818927 - - - - -]
> > [3830bc00-1541-4951-b4ed-e73faafaa78c] AMQP server on
> > 10.6.20.21:5672 is unreachable: connection already closed. Trying
> > again in 1 seconds.: amqp.exceptions.RecoverableConnectionError:
> > connection already closed
> > 2020-12-09 13:24:30.361 8 INFO oslo.messaging._drivers.impl_rabbit
> > [req-4226ac03-a5b7-446a-a74b-2785f9818927 - - - - -]
> > [3830bc00-1541-4951-b4ed-e73faafaa78c] Reconnected to AMQP server on
> > 10.6.20.21:5672 via [amqp] client with port 55524.
> > 2020-12-09 13:26:28.377 8 ERROR oslo.messaging._drivers.impl_rabbit
> > [req-4226ac03-a5b7-446a-a74b-2785f9818927 - - - - -] Failed to publish
> > message to topic 'scheduler_fanout': :
> > amqp.exceptions.MessageNacked
> > 2020-12-09 13:26:28.377 8 ERROR oslo.messaging._drivers.impl_rabbit
> > [req-4226ac03-a5b7-446a-a74b-2785f9818927 - - - - -] Unable to connect
> > to AMQP server on 10.6.20.21:5672 after inf tries: :
> > amqp.exceptions.MessageNacked
> > 2020-12-09 13:26:28.378 8 ERROR oslo_service.periodic_task
> > [req-4226ac03-a5b7-446a-a74b-2785f9818927 - - - - -] Error during
> > ComputeManager._sync_scheduler_instance_info:
> > oslo_messaging.exceptions.MessageDeliveryFailure: Unable to connect to
> > AMQP server on 10.6.20.21:5672 after inf tries:
> > =================================================
> >
> > Thanks!
> > Tony
> 
> 
>