What is RabbitMQ?

RabbitMQ is open source message broker software (sometimes called message-oriented middleware) that implements the Advanced Message Queuing Protocol (AMQP). The RabbitMQ server is written in the Erlang programming language and is built on the Open Telecom Platform framework for clustering and failover. Client libraries to interface with the broker are available for all major programming languages.

wikipedia.org/wiki/RabbitMQ

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How to use this image

Running the daemon

One of the important things to note about RabbitMQ is that it stores data based on what it calls the "Node Name", which defaults to the hostname. What this means for usage in Docker is that we should specify -h/--hostname explicitly for each daemon so that we don't get a random hostname and can keep track of our data:

$ docker run -d --hostname my-rabbit --name some-rabbit rabbitmq:3

If you give that a minute, then do docker logs some-rabbit, you'll see in the output a block similar to:

=INFO REPORT==== 6-Jul-2015::20:47:02 ===
node           : rabbit@my-rabbit
home dir       : /var/lib/rabbitmq
config file(s) : /etc/rabbitmq/rabbitmq.config
cookie hash    : UoNOcDhfxW9uoZ92wh6BjA==
log            : tty
sasl log       : tty
database dir   : /var/lib/rabbitmq/mnesia/rabbit@my-rabbit

Note the database dir there, especially that it has my "Node Name" appended to the end for the file storage. This image makes all of /var/lib/rabbitmq a volume by default.

Erlang Cookie

See the RabbitMQ "Clustering Guide" for more information about cookies and why they're necessary.

For setting a consistent cookie (especially useful for clustering but also for remote/cross-container administration via rabbitmqctl), use RABBITMQ_ERLANG_COOKIE:

$ docker run -d --hostname my-rabbit --name some-rabbit -e RABBITMQ_ERLANG_COOKIE='secret cookie here' rabbitmq:3

This can then be used from a separate instance to connect:

$ docker run -it --rm --link some-rabbit:my-rabbit -e RABBITMQ_ERLANG_COOKIE='secret cookie here' rabbitmq:3 bash
root@f2a2d3d27c75:/# rabbitmqctl -n rabbit@my-rabbit list_users
Listing users ...
guest   [administrator]

Alternatively, one can also use RABBITMQ_NODENAME to make repeated rabbitmqctl invocations simpler:

$ docker run -it --rm --link some-rabbit:my-rabbit -e RABBITMQ_ERLANG_COOKIE='secret cookie here' -e RABBITMQ_NODENAME=rabbit@my-rabbit rabbitmq:3 bash
root@f2a2d3d27c75:/# rabbitmqctl list_users
Listing users ...
guest   [administrator]

Management Plugin

There is a second set of tags provided with the management plugin installed and enabled by default, which is available on the standard management port of 15672, with the default username and password of guest / guest:

$ docker run -d --hostname my-rabbit --name some-rabbit rabbitmq:3-management

You can access it by visiting http://container-ip:15672 in a browser or, if you need access outside the host, on port 8080:

$ docker run -d --hostname my-rabbit --name some-rabbit -p 8080:15672 rabbitmq:3-management

You can then go to http://localhost:8080 or http://host-ip:8080 in a browser.

Setting default user and password

If you wish to change the default username and password of guest / guest, you can do so with the RABBITMQ_DEFAULT_USER and RABBITMQ_DEFAULT_PASS environmental variables:

$ docker run -d --hostname my-rabbit --name some-rabbit -e RABBITMQ_DEFAULT_USER=user -e RABBITMQ_DEFAULT_PASS=password rabbitmq:3-management

You can then go to http://localhost:8080 or http://host-ip:8080 in a browser and use user/password to gain access to the management console

Setting default vhost

If you wish to change the default vhost, you can do so wiht the RABBITMQ_DEFAULT_VHOST environmental variables:

$ docker run -d --hostname my-rabbit --name some-rabbit -e RABBITMQ_DEFAULT_VHOST=my_vhost rabbitmq:3-management

Connecting to the daemon

$ docker run --name some-app --link some-rabbit:rabbit -d application-that-uses-rabbitmq

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