An Entity is Apache Brooklyn's representation of a software package or service which it can control or interact with. Some of the entities already available for Apache Brooklyn are listed in the Brooklyn Catalog.

To list the entities of the application you can use the entity or ent command:

{% highlight bash %} $ br application Tomcat entity {% endhighlight %}

This shows one entity is available: tomcatServer. Note that this is the name we gave the entity in the YAML in Launching from a Blueprint on the previous page.

You can get summary information for this entity by providing its name (or ID).

{% highlight bash %} $ br application Tomcat entity tomcatServer {% endhighlight %}

Also you can see the configuration of this entity with the config command.

{% highlight bash %} $ br application Tomcat entity tomcatServer config {% endhighlight %}