How to use environment variables in docker compose

Question

I would like to be able to use env variables inside docker-compose.yml, with values passed in at the time of docker-compose up. This is the example.

I am

Answer 1

The following is applicable for docker-compose 3.x Set environment variables inside the container

method - 1 Straight method

web:
  environment:
    - DEBUG=1
      POSTGRES_PASSWORD: 'postgres'
      POSTGRES_USER: 'postgres'

method - 2 The “.env” file

Create a .env file in the same location as the docker-compose.yml

$ cat .env
TAG=v1.5
POSTGRES_PASSWORD: 'postgres'

and your compose file will be like

$ cat docker-compose.yml
version: '3'
services:
  web:
    image: "webapp:${TAG}"
    postgres_password: "${POSTGRES_PASSWORD}"

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