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Unable to connect to AMQP server

asked 2014-07-03 16:31:30 -0600

andi gravatar image

I used devstack in the all-in-one config. This is working well. I gave this box, which I'll call the "controller" box, the IP

Now, I am trying to add a single extra compute node to the setup. So I created a new box with IP I used a local.conf that has this


enable_service neutron nova n-cpu qpid

./ on the new compute node works fine. But when I go to the n-cpu screen, I see that n-cpu is having trouble connecting to the AMQP server running on the controller node. I see messages like this:

2014-07-03 17:19:35.684 ERROR oslo.messaging._drivers.impl_qpid [req-9af44cb5-4dab-4a79-92bc-bd50f9f11006 None None] Unable to connect to AMQP server on {'username': '', 'host': '', 'password': ''}: client: 0-10, server: 9-1. Sleeping 5 seconds

What is going wrong? How can I fix this?

It looks like rabbitmq is running and that I can reach it from both controller and the new compute node, since I can telnet into the controller at the rabbit port (see .

from the controller:

[vagrant@vagrant-fedora20 devstack]$ telnet localhost 5672
Trying ::1...
Connected to localhost.
Escape character is '^]'.
AMQP    Connection closed by foreign host.

and from the compute node:

[vagrant@vagrant-fedora20 devstack]$ telnet 5672
Connected to
Escape character is '^]'.
AMQP    Connection closed by foreign host.

So that seems to rule out firewall problems.

It seems suspicious that in the connection to the amqp server the username and password are empty strings. Could this be the problem? Where do I specify the amqp username and password to use for the n-cpu process?

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answered 2014-07-03 22:56:37 -0600

andi gravatar image

I was able to resolve the problem. I think the problem is that I did not include rabbit in my enabled services on the compute node. Concretely, I set this in my local.conf:

enable_service n-cpu rabbit neutron q-agt

and added


and then rebuilt the compute node. After this, I'm able to connect to AMQP and the compute node shows up in the hypervisor-list.

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Asked: 2014-07-03 16:31:30 -0600

Seen: 1,659 times

Last updated: Jul 03 '14