Spring Cloud Bus uses
Spring Cloud Stream to
broadcast the messages so to get messages to flow you only need to
include the binder implementation of your choice in the
classpath. There are convenient starters specifically for the bus with
AMQP (RabbitMQ) and Kafka
spring-cloud-starter-bus-[amqp,kafka]). Generally speaking
Spring Cloud Stream relies on Spring Boot autoconfiguration
conventions for configuring middleware, so for instance the AMQP
broker address can be changed with
configuration properties. Spring Cloud Bus has a handful of native
configuration properties in
spring.cloud.bus.destination is the name of the topic to use
the the externall middleware). Normally the defaults will suffice.
To lean more about how to customize the message broker settings consult the Spring Cloud Stream documentation.