Pass argument to docker compose

Question

In my docker compose file there is a dynamic field which I\'d like to generate during the running. Actually it is a string template:

environment:
    - SERVE         


        

Answer 1

In docker-compose, arguments are available and usefull only in dockerfile. You can specify what you are doing in the level ahead like following:

#dockerfile
ARG PORT
ENV SERVER_URL "https://0.0.0.0:$PORT"

Your port can be set in your docker-compose.yml:

build:
  context: .
  args:
    - PORT=443

It is actually an environment variable in any case. You can pass it through your run command if that fits to you:

PORT=443 docker-compose run 
#or
docker-compose run  -e PORT=443