Slow instance launch times due to RabbitMQ

Laurent Dumont laurentfdumont at
Wed Jul 31 10:49:15 UTC 2019

Could you forward the output of the following commands on a controller
node? :

rabbitmqctl cluster_status
rabbitmqctl list_queues

You won't necessarily see a high load on a Rabbit cluster that is in a bad

On Wed, Jul 31, 2019 at 5:19 AM Grant Morley <grant at> wrote:

> 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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