How to pass port mapping dynamically to the docker-compose up command?

Question

I have two container images and doing compose and running the docker using "docker-compose up -d". This works fine. I want to run the same container image in another port say 8081. Can we pass port mapping as a command line parameter docker-compose up -port novnc :8081:8080? How to pass port mapping dynamically to the docker-compose up command?

version: '2'
services:
  ide:
    image: myApp
    image: myImage:latest
    environment:
      - DISPLAY=novnc:0.0
    depends_on:
      - novnc
    networks:
      - x11
  novnc:
    image: myImageTwo:latest
    environment:
      - DISPLAY_WIDTH=1600
      - DISPLAY_HEIGHT=968
    ports:
      - "8080:8080"
    networks:
      - x11
networks:
  x11:

Answer 1

use a ${VAR} in your docker-compose.yml

e.g.

version: '2'
services:
  apache:
    image: httpd:2.4
    volumes:
      - .:/usr/local/apache2/htdocs/
    ports:
      - ${APP_PORT}:80

then use environment variable:

$ export APP_PORT=8080
$ docker-compose up

or inline version:

$ APP_PORT=8080 docker-compose up