咨询：RabbitMQ Federation插件是否支持AMQP与MQTT及MQTT额外配置？

Great question! Let's break this down clearly so you know exactly how it works:

1. Does RabbitMQ Federation support both AMQP and MQTT messages? #

• AMQP: Yes, fully natively. Federation was built specifically for AMQP—it’s designed to mirror exchanges and queues across RabbitMQ clusters or standalone nodes, handling AMQP messages seamlessly as part of its core functionality.
• MQTT: Indirectly, yes. Here’s why: RabbitMQ handles MQTT via the rabbitmq_mqtt plugin, which maps MQTT topics to AMQP routing keys and routes messages through AMQP exchanges (by default, amq.topic). Since Federation operates at the AMQP layer, if the AMQP exchange/queue used by your MQTT setup is federated, MQTT messages will automatically flow through the Federation setup. Federation doesn’t interact directly with the MQTT protocol, but it works with the underlying AMQP entities that MQTT relies on.

2. Are extra configurations needed if supporting MQTT? #

Absolutely—here’s what you’ll need to do:

• First, ensure both required plugins are enabled:

  rabbitmq-plugins enable rabbitmq_federation rabbitmq_mqtt
  

• Next, create a Federation policy that targets the AMQP exchange used by MQTT (default is amq.topic, or your custom exchange if you’ve configured one). This policy defines which upstream clusters/nodes to federate with, and how messages should be mirrored.
• If your MQTT clients use persistent session queues (auto-created or custom), and you want those queues to be federated too, adjust your Federation policy to include these queues (or create a separate policy for them) by setting the appropriate pattern to match the queue names.

The key takeaway is that Federation works with AMQP entities, so you just need to ensure the AMQP resources tied to your MQTT traffic are covered by Federation policies—no special protocol-specific config for MQTT itself is required.

内容的提问来源于stack exchange，提问作者Haiyan GU