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<div class="paragraph">
<p>Spring Cloud Bus works by adding Spring Boot autconfiguration if it detects itself on the
classpath. To enable the bus, add <code>spring-cloud-starter-bus-amqp</code> or
<code>spring-cloud-starter-bus-kafka</code> to your dependency management. Spring Cloud takes care of
the rest. Make sure the broker (RabbitMQ or Kafka) is available and configured. When
running on localhost, you need not do anything. If you run remotely, use Spring Cloud
Connectors or Spring Boot conventions to define the broker credentials, as shown in the
following example for Rabbit:</p>
</div>
<div class="listingblock">
<div class="title">application.yml</div>
<div class="content">
<pre>spring:
rabbitmq:
host: mybroker.com
port: 5672
username: user
password: secret</pre>
</div>
</div>
<div class="paragraph">
<p>The bus currently supports sending messages to all nodes listening or all nodes for a
particular service (as defined by Eureka). The <code>/bus/*</code> actuator namespace has some HTTP
endpoints. Currently, two are implemented. The first, <code>/bus/env</code>, sends key/value pairs to
update each node&#8217;s Spring Environment. The second, <code>/bus/refresh</code>, reloads each
application&#8217;s configuration, as though they had all been pinged on their <code>/refresh</code>
endpoint.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
The Spring Cloud Bus starters cover Rabbit and Kafka, because those are the two most
common implementations. However, Spring Cloud Stream is quite flexible, and the binder
works with <code>spring-cloud-bus</code>.
</td>
</tr>
</table>
</div>
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