How to generate certs for secured connection from Celery to Redis

I’m following this tutorial, and adjusting the Celery-background related code to my project.

In my case I am operating in a Docker environment, and I have a secured site (i.e. https://localhost) which requires secured ssl communication.

The documentation in here shows an example on how to provide cert related files (keyfile, certfile, ca_certs).
But it is not clear to me how to create these files in the first place.

The tutorial in here shows how to create a custom certificate authority, and how to sign a certificate with it.
I followed the steps and created the 3 files:

• keyfile – dev.mergebot.com.crt – the signed certificate (signed by myCA.pem)
• ca_certs – dev.mergebot.com.key – private key to create a signed cert with “self-trusted CA”
• certfile – myCA.pem – “self-trusted CA” certificate (filename in the tutorial: myCA.pem)

Note that I created these 3 files completely unrelated to Celery or Redis or Docker.
They were created in my local machine outside Docker. The files don’t have the name of the Redis container and the Common Name in the cert was set to “foo”

When I use these files in my webapp, there is no connection from Celery to Redis.
Without ssl I do get a connection, so the overall environment aside from ssl is OK – see here

Is there any specific requirements to create the cert related files? (e.g. should the Common Name in the cert have the container name “redis”, etc… )

Is there a way to test the validity of the certs without the app, e.g. by issuing a command from the container shell?

Thanks