Hi ,

In development environment the values are read from .env file. But as .env file is not loaded in the prod. So from where these environment variables are read in prod?

That really varies depending on your own production environment setup.

I did a quick check to find a StackOverflow article that might explain setting up Environment Variables in Linux in a helpful way without making this reply super long.

Here are links to some of the more common providers:
- Heroku
- AWS Lambda
- AWS ElasticBeanstalk

I've not yet had the time to properly tinker with Docker (but it's definitely in my backlog of things to get through real soon) so I wouldn't feel comfortable telling you the best way to handle environment variables there. I'm sure the documentation would help greatly.