Tie Your Rabbit Down

I’ve been running the Tripleo Quickstart to setup my development deployments. While looking into the setup, I noticed that the default Rabbit deployment is wide open. I can’t see anything other than firewall port blocking in place. I dug deeper.

All of the services use the following values to talk to the Queues

  RabbitUserName:  guest
  RabbitPassword: guest

The Access Control List (ACL) allows all powers over all queues. There is no Transport Layer Security on the network communication.

I was able to address the first issue by editing the openstack-deploy.sh script that Tripleo Quickstart generates. There is a heredoc section that sets many of the defaults that go into the yaml confiog file used as the input for openstack overcloud create. I added:

  RabbitUserName:  fubar
  RabbitPassword: fumtu

And confirmed that the cloud worked with these changes by running

git clone https://git.openstack.org/openstack-infra/tripleo-ci
tripleo-ci/scripts/tripleo.sh  --overcloud-pingtest

As well as sshing to the controller and running

$ sudo rabbitmqctl list_users
Listing users ...
fubar	[administrator]
$ sudo grep -i rabbit_password /etc/nova/nova.conf 
# Deprecated group;name - DEFAULT;rabbit_password

While I was tempted to tackle this in Quickstart, I think it is better to leave the issue visible there and instead tackle it in the Tripleo library.

We deploy all of Rabbit in a single vhost:

$ sudo rabbitmqctl list_vhosts
Listing vhosts ...

But we do allow for the separation of the RPC mechanism from the Notifications:

In the Nova config file:

# The topic compute nodes listen on (string value)
#  (string value)


The Keystone config file only has the notifications section. All have the Rabbit Userid and Password in the clear.

The Oslo RPC call is based on creating a response Queue. I would like to permit only the intended RPC target to write to this response Queue. However, these queues are generated using a Random UUID.

def _get_reply_q(self):
        with self._reply_q_lock:
            if self._reply_q is not None:
                return self._reply_q

            reply_q = 'reply_' + uuid.uuid4().hex

            conn = self._get_connection(rpc_common.PURPOSE_LISTEN)

            self._waiter = ReplyWaiter(reply_q, conn,

            self._reply_q = reply_q
            self._reply_q_conn = conn

This makes it impossible to write a regular expression to limit the set of accessible queues.

What services actually have presence on the compute nodes? (some lines removed for clarity)

$ sudo lsof -i tcp:amqp
neutron-o 17236    neutron    8u  IPv4  40581      0t0  TCP overcloud-novacompute-0.localdomain:53049->overcloud-controller-0.localdomain:amqp (ESTABLISHED)
neutron-o 17236    neutron   19u  IPv4  40590      0t0  TCP overcloud-novacompute-0.localdomain:53058->overcloud-controller-0.localdomain:amqp (ESTABLISHED)
nova-comp 17269       nova    4u  IPv4  40572      0t0  TCP overcloud-novacompute-0.localdomain:53047->overcloud-controller-0.localdomain:amqp (ESTABLISHED)
nova-comp 17269       nova   19u  IPv4 130115      0t0  TCP overcloud-novacompute-0.localdomain:53157->overcloud-controller-0.localdomain:amqp (ESTABLISHED)
ceilomete 17682 ceilometer   12u  IPv4 130381      0t0  TCP overcloud-novacompute-0.localdomain:53162->overcloud-controller-0.localdomain:amqp (ESTABLISHED)

In order to trace the connections, I created three rabbit users witth uuidgen based passwords:

sudo rabbitmqctl add_user overcloud-ceil-0 28d90d7c-1ebb-47a6-b58b-3df7aef1f6bf
sudo rabbitmqctl add_user overcloud-neutron-0 1290a77d-35a1-4afa-b5ea-cbc8f9387754
sudo rabbitmqctl add_user overcloud-novacompute-0 53493010-37b3-4188-bd88-b933b9322c7c
sudo rabbitmqctl add_user keystone 4810a2c6-60f0-4014-8fbb-d628ad9d52f9
sudo rabbitmqctl set_permissions overcloud-ceil-0 ".*" ".*" ".*"
sudo rabbitmqctl set_permissions overcloud-neutron-0 ".*" ".*" ".*"
sudo rabbitmqctl set_permissions overcloud-novacompute-0 ".*" ".*" ".*"
sudo rabbitmqctl set_permissions keystone ".*" ".*" ".*"

First, I tested editing the Keystone server on the controller, and was able to see the user change from guest to keystone.

Then, I used the appropriate values on the compute node for the rabbit_user_id and rabbit_password values in the files:


Then restarted the node. After reboot, Nova and Neutron came back, but Ceilometer was not happy (even after cycling the services on both the control node and the compute node.

$ sudo lsof -i tcp:amqp
neutron-o 1680 neutron    8u  IPv4  23125      0t0  TCP overcloud-novacompute-0.localdomain:49085->overcloud-controller-0.localdomain:amqp (ESTABLISHED)
neutron-o 1680 neutron   19u  IPv4  23449      0t0  TCP overcloud-novacompute-0.localdomain:49096->overcloud-controller-0.localdomain:amqp (ESTABLISHED)
nova-comp 1682    nova    4u  IPv4  24066      0t0  TCP overcloud-novacompute-0.localdomain:49097->overcloud-controller-0.localdomain:amqp (ESTABLISHED)
nova-comp 1682    nova   20u  IPv4 487795      0t0  TCP overcloud-novacompute-0.localdomain:49582->overcloud-controller-0.localdomain:amqp (ESTABLISHED)

Going back to the controller> There is obviously a 1 to 1 relationship between the connections from the compute node and the entities that rabbitmqctl allows us to list:

$sudo rabbitmqctl list_connections
keystone	43714	running
keystone	43921	running
overcloud-neutron-0	49085	running
overcloud-neutron-0	49096	running
overcloud-novacompute-0	49097	running
overcloud-novacompute-0	49582	running

With this information we should be able to put together a map of which service talks on which channel.

This is a complex system. I’m going to do some more digging, and see if I can come up with an approach to lock things down a bit better.

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