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Last updated: 20 Feb 2024

Manage AmazonMQ

RabbitMQ is a message broker based on the Advanced Message Queuing Protocol (AMQP). Publishing’s RabbitMQ cluster is provided by AWS’ AmazonMQ service.

Learn more about RabbitMQ.

Connecting to the RabbitMQ web control panel

Run gds govuk connect amazonmq -e integration and point your browser at the URL it gives you - it will look like, but will have a random port number. You can connect to staging and production the same way, just replace integration above with the environment of your choice.

The username is root and the passwords for each environment are in 2ndline/publishing-amazonmq in Secrets Manager in the production AWS account.

AmazonMQ metrics

A generic AmazonMQ dashboard shows metrics for queues and exchanges.

How we run RabbitMQ


A graph showing the message flow

Producer: an application that publishes messages to RabbitMQ. On GOV.UK this could be publishing-api.

Exchanges are AMQP entities where messages are sent. They take a message and route it into zero or more queues. The routing algorithm used depends on the exchange type and rules called bindings. When a content change is made in a publishing application (e.g. Travel Advice Publisher), Publishing API publishes a message to our main exchange, publishing_documents.

Queues are very similar to queues in other message and task-queueing systems: they store messages that are consumed by applications. An example of a queue is email_alert_service which is used by email-alert-service to forward publishing activity to email-alert-api. Queues are created by consumer applications.

Bindings are rules that exchanges use (among other things) to route messages to queues. To instruct an exchange E to route messages to a queue Q, Q has to be bound to E. Bindings may have an optional routing key attribute. An example of a binding is the email_alert_service queue is bound to the published_documents exchange with a routing key matching of *.major. E.g messages sent to the exchange with a routing key of guide.major will be routed to that queue.

Messages consist of a JSON payload and publish options (we predominantly use content type, routing key and persistant).


  • content_type (string) - tells the consumer the type of message. E.g "application/json"
  • routing_key (string) - matches against bindings to filter messages to certain queues. E.g "guide.major"
  • persistant (boolean) - tells RabbitMQ whether to save the message to disk.

Message options are set when a message is published. In our use case, the message’s payload is the content item in JSON format. The code in the publishing-api to publish a message is here.

Consumer applications are applications which consume messages from one or more queues. For email-alert-service this is done by running this rake task and using the major change processor to do the processing of the consumed messages. All our consumer applications use the govuk_message_queue_consumer gem to consume messages from RabbitMQ in a standardised way.

You can see live examples of things like queues, exchanges, bindings etc by connecting to the RabbitMQ control panel (see above).

Further reading