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[ops][neutron]After an upgrade to openstack queens, Neutron is unable to communicate properly with rabbitmq


Hi,

We had a Pike openstack setup that we updated to Queens earlier this week. Itâ??s a 30 compute nodes infrastructure with 2 controller nodes and 2 network nodes, using openvswitch for networking. Since we upgraded to queens, neutron-server on the controller nodes has been unable to contact the openvswitch-agents through rabbitmq. The rabbitmq is clustered on both controller nodes and has been giving us the following error when neutron-server connections fail :

=ERROR REPORT==== 5-Jun-2019::18:50:08 ===
closing AMQP connection <0.23859.0> (10.30.0.11:53198 -> 10.30.0.11:5672 - neutron-server:1170:ccf11f31-2b3b-414e-ab19-5ee2cf5dd15d):
missed heartbeats from client, timeout: 60s 

The neutron-server logs show this error:

2019-06-05 18:50:33.132 1169 ERROR oslo.messaging._drivers.impl_rabbit [req-17167988-c6f2-475e-8b6a-90b92777e03a - - - - -] [b7684919-c98b-402e-90c3-59a0b5eccd1f] AMQP server on controller1:5672 is unreachable: [Errno 104] Connection reset by peer. Trying again in 1 seconds.: error: [Errno 104] Connection reset by peer
2019-06-05 18:50:33.217 1169 ERROR oslo.messaging._drivers.impl_rabbit [-] [bd6900e0-ab7b-4139-920c-a456d7df023b] AMQP server on controller1:5672 is unreachable: <RecoverableConnectionError: unknown error>. Trying again in 1 seconds.: RecoverableConnectionError: <RecoverableConnectionError: unknown error>

The relevant service version numbers are as follow:
rabbitmq-server-3.6.5-1.el7.noarch
openstack-neutron-12.0.6-1.el7.noarch
python2-oslo-messaging-5.35.4-1.el7.noarch

Rabbitmq does not show any alert. It also has plenty of memory and a high enough file limit. The login user and credentials are fine as they are used in other openstack services which can contact rabbitmq without issues.

Iâ??ve tried optimizing rabbitmq, upgrading, downgrading, increasing timeouts in neutron services, etc, to no avail. I find myself at a loss and would appreciate if anyone has any idea as to where to go from there.

Best regards,

Jean-Philippe Méthot
Openstack system administrator
Administrateur système Openstack
PlanetHoster inc.




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