CODEWITHSUNDEEP
dockerenvironment-variablesdocker-compose
Suthan Bala
Suthan Bala

Reputation: 3299

How to get the environment variable from .env file on to a docker-compose.yml?

I have an .env file and a docker-compose file. I reference the env file using the env_file property on the docker-compose. Then I use the variable interpolation to set another environment variable using the variable defined in the .env file. For some reason, Docker doesn't recognize the variable defined in the .env file.

app.env:

MYSQL_DATABASE=wordpress
DB_USER=root
MYSQL_ROOT_PASSWORD=example

docker-compose.yml:

version: '3.1'
services:
  wordpress:
    container_name: 'wp'
    build: .
    restart: unless-stopped
    links:
      - mysql
    env_file:
      - app.env
    environment:
      - WORDPRESS_DB_USER=${DB_USER}
      - WORDPRESS_DB_PASSWORD=${MYSQL_ROOT_PASSWORD}
      - WORDPRESS_DB_NAME=${MYSQL_DATABASE}
    ports:
      - 80:80

Upvotes: 5

Views: 4121

Answers (1)

nickgryg
nickgryg

Reputation: 28593

It seems you mixed up the meaning of the env_file configuration option. It is passing multiple environment variables from an external file through to a service’s containers. It is the same as environment, but they are loaded from the file.

If you want to docker compose recognize the variable defined in the .env file it should be exactly .env file.

To achieve what you want you need:

1. Rename app.env to .env:

mv app.env .env

2. Delete env_file configuration option from docker-compose.yaml:

version: '3.1'
services:
  wordpress:
    container_name: 'wp'
    build: .
    restart: unless-stopped
    links:
      - mysql
    environment:
      - WORDPRESS_DB_USER=${DB_USER}
      - WORDPRESS_DB_PASSWORD=${MYSQL_ROOT_PASSWORD}
      - WORDPRESS_DB_NAME=${MYSQL_DATABASE}
    ports:
      - 80:80

Upvotes: 7

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