title: Find RabbitMQ BROKER_URL
body: <p>this question may be too obvious, but this is the first time I work with Celery and RabbitMQ or anything similar. I need to declare my <code>BROKER_URL</code> somewhere, but I don't even know how to find it.. where is it? on the terminal I write <code>sudo rabbitmq-server</code> and I can see rabbitmq is running. </p>