Documentation says that rabbitmq has config: /etc/rabbitmq/rabbitmq.conf but I have nothing there, but rabbitmq-server is running and consuming messages.
Where is my config file?
It depends in which way you install RabbitMQ. The file usually is not present. If you need it, you have to create it.
For example if you use the package:
rabbitmq-server-mac-standalone-3.4.2.tar.gz
You can find the example file:
etc/rabbitmq/rabbitmq.config.example
and not the file.
Using RABBITMQ_CONFIG_FILE
you can specify the rabbitmq.config file, to be sure you can check this variable.