Slow instance launch times due to RabbitMQ

Grant Morley grant at
Wed Jul 31 09:14:18 UTC 2019

Hi all,

We are randomly seeing slow instance launch / deletion times and it 
appears to be because of RabbitMQ. We are seeing a lot of these messages 
in the logs for Nova and Neutron:

ERROR oslo.messaging._drivers.impl_rabbit [-] 
[f4ab3ca0-b837-4962-95ef-dfd7d60686b6] AMQP server on is 
unreachable: Too many heartbeats missed. Trying again in 1 seconds. 
Client port: 37098: ConnectionForced: Too many heartbeats missed

The RabbitMQ cluster isn't under high load and I am not seeing any 
packets drop over the network when I do some tracing.

We are only running 15 compute nodes currently and have >1000 instances 
so it isn't a large deployment.

Are there any good configuration tweaks for RabbitMQ running on 
OpenStack Queens?

Many Thanks,


Grant Morley
Cloud Lead, Civo Ltd <>| Signup for an account! 
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