How do I use an .env file in Docker?

How do I use an .env file in Docker?

You can use an .env file in Docker by specifying it in your Docker Compose file or using the --env-file option with the docker run command.

Can you show me an example of a Docker Compose file with an .env file?

Sure! Here's a simple example:

version: '3'
services:
  app:
    image: myapp
    env_file:
      - .env

This will load the environment variables defined in the .env file into the app service.

What should I include in my .env file?

Your .env file should include key-value pairs for environment variables, like this:

DB_HOST=localhost
DB_USER=root
DB_PASS=password

Is there a way to check if the environment variables are loaded correctly?

Yes! You can check the environment variables by running docker exec -it <container_name> env to see the loaded variables.