User and Password creation in official docker image

[sneha panda]

Hi,

I am using the image available at docker hub (rabbitmq:3-management). I was going through the dockerfile and entry point but could not get how the user and password creation is happening. 

The confusion starts here, as I don't see rabbitmq by itself support environment variable 

 https://www.rabbitmq.com/configure.html#supported-environment-variables

 but in the community image, it does. Below lines from the doc and I have tested also

 

"The administrative user credentials should be stored in a Kubernetes Secret, and mounting them onto the RabbitMQ Pods. The RABBITMQ_DEFAULT_USER and RABBITMQ_DEFAULT_PASS environment variables then can be set to the Secret values. The community Docker image will use them to override default user credentials."

reference:-https://blog.rabbitmq.com/posts/2020/08/deploying-rabbitmq-to-kubernetes-whats-involved/

so basically how those env variables are getting used as it is not running rabbitmqctl to create a user (at least could not find in entry point) neither it is storing in different config file from where it is getting loaded . 

Please direct me if I am missing anything on the basic understanding part, will go through that.