Docker Compose with environment variable setting.

docker-compose.yml

version: "3.5"
#$ docker run -d -p 6379:6379 redis
services:
  redis:
    image : redis
    ports:
      - "6379:6379"

  api_server:
    depends_on:
      - redis
    build:
      context: .
      dockerfile: api.Dockerfile
    environment:
      PORT: 80
    ports:
      - "80:80"



  selam_server:
      build:
        context: .
        dockerfile: selam.Dockerfile
      environment:
        PORT: 15120

      ports:
        - "15120:15120"