Docker-compose env file not working

Question

I'm writing as docker-compose file to up MySQL instance and want to use few variable from env file: here are the files actually look like:

docker-compose.yml

version: '3.3' services:   db:     image: mysql     restart: always     env_file:       - ./imran.env     environment:       MYSQL_ROOT_PASSWORD: ${PASS}     ports:       - ${PORT1}: ${PORT2} 

imran.env

PASS=imran123 PORT1=3306 PORT2=3306 

Instead of working correct i'm getting following errors:

WARNING: The PASS variable is not set. Defaulting to a blank string. WARNING: The PORT2 variable is not set. Defaulting to a blank string. ERROR: The Compose file './docker-compose.yml' is invalid because: services.db.ports contains unsupported option: '${PORT1} 

Please Help

Answer 1

You have some issues in your docker-compose.yaml file:

A:

A space symbol between ports values. It should be without a space:

ports:   - ${PORT1}:${PORT2} 

B:

You need to use .env file in folder where docker-compose.yaml is in order to declaring default environment variables for both docker-compose.yaml file and docker container. env_file section is used to put values into container only.

So, you should do the following:

1.

Re-name file with ENV variables to .env:

mv imran.env .env 

2.

Use the following docker-compose.yaml after:

version: '3.3' services:   db:     image: mysql     restart: always     environment:       MYSQL_ROOT_PASSWORD: ${PASS}     ports:       - ${PORT1}:${PORT2}