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


On 6/5/19 1:01 PM, Jean-Philippe Méthot wrote:
> 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>

Are there possibly any firewall rules getting in the way?  Connection 
reset by peer usually means the other end has sent a TCP Reset, which 
wouldn't happen if the permissions were wrong.

As a test, does this connect?

$ telnet controller1 5672
Trying $IP...
Connected to controller1.
Escape character is '^]'.

-Brian


> 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.
> 
> 
> 
>