How do I pass environment variables to Docker containers?

Question

I\'m new to Docker, and it\'s unclear how to access an external database from a container. Is the best way to hard-code in the connection string?

# Dockerfil         


        

Answer 1

docker run --rm -it --env-file <(bash -c 'env | grep ') Is a way to grep the data stored within a .env and pass them to Docker, without anything being stored unsecurely (so you can't just look at docker history and grab keys.

Say you have a load of AWS stuff in your .env like so:

AWS_ACCESS_KEY: xxxxxxx
AWS_SECRET: xxxxxx
AWS_REGION: xxxxxx

running docker with ```docker run --rm -it --env-file <(bash -c 'env | grep AWS_') will grab it all and pass it securely to be accessible from within the container.