如何将端口映射动态传递给 docker-compose up 命令？

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

eg

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

Answer 2

You can do it using the .env file.
For example, you'll have something like this :

$ cat .env
TAG=v1.5

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

In the example, you can see that the tag value is in a variable that is set in the env file.

You can find out more in the official doc

Answer 3

Change your ports section to:

    ports:
      - "${MY_PORT}:8080"

and then just use MY_PORT=8081 docker-compose up -d

Answer 4

you can also use a port range

ports:
  - "8080-8081:8080"

so you don't have to pass as parameter