Using RabbitMQ as a Message Broker

RabbitMQ is a very popular message broker that you can use as an alternative to PostgreSQL.

Switching from PostgreSQL to RabbitMQ

To use RabbitMQ instead of PostgreSQL as a message broker:

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        --- a/config/packages/messenger.yaml
+++ b/config/packages/messenger.yaml
@@ -5,10 +5,7 @@ framework:
         transports:
             # https://symfony.com/doc/current/messenger.html#transport-configuration
             async:
-                dsn: '%env(MESSENGER_TRANSPORT_DSN)%'
-                options:
-                    use_notify: true
-                    check_delayed_interval: 60000
+                dsn: '%env(RABBITMQ_URL)%'
                 retry_strategy:
                     max_retries: 3
                     multiplier: 2
    

We also need to add RabbitMQ support for Messenger:

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        $ symfony composer req amqp-messenger
    

As you might have guessed, we also need to add RabbitMQ to the Docker Compose stack:

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        --- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -19,6 +19,10 @@ services:
     image: redis:5-alpine
     ports: [6379]

+  rabbitmq:
+    image: rabbitmq:3.7-management
+    ports: [5672, 15672]
+
 volumes:
 ###> doctrine/doctrine-bundle ###
   db-data:
    

To force Docker Compose to take the RabbitMQ container into account, stop the containers and restart them:

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        $ docker-compose stop
$ docker-compose up -d
    

If you want to see queues and messages flowing through RabbitMQ, open its web management interface:

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        $ symfony open:local:rabbitmq
    

Or from the web debug toolbar:

Use guest/guest to login to the RabbitMQ management UI:

Adding RabbitMQ to the production servers can be done by adding it to the list of services:

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        --- a/.platform/services.yaml
+++ b/.platform/services.yaml
@@ -18,3 +18,8 @@ files:

 rediscache:
     type: redis:5.0
+
+queue:
+    type: rabbitmq:3.7
+    disk: 1024
+    size: S
    

Reference it in the web container configuration as well and enable the amqp PHP extension:

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        --- a/.platform.app.yaml
+++ b/.platform.app.yaml
@@ -8,6 +8,7 @@ dependencies:

 runtime:
     extensions:
+        - amqp
         - apcu
         - blackfire
         - ctype
@@ -41,6 +42,7 @@ mounts:
 relationships:
     database: "database:postgresql"
     redis: "rediscache:redis"
+    rabbitmq: "queue:rabbitmq"

 hooks:
     build: |
    

When the RabbitMQ service is installed on a project, you can access its web management interface by opening the tunnel first:

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        $ symfony cloud:tunnel:open
$ symfony open:remote:rabbitmq

# when done
$ symfony cloud:tunnel:close
    

This work, including the code samples, is licensed under a Creative Commons BY-NC-SA 4.0 license.