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:
    - SERVER_URL:https://0.0.0.0:${PORT}

And I want to configure this PORT parameter dynamically

docker-compose run <service> PORT=443

In documentation there is ARGS parameters set I suppose I can use. But there is no information how can I use those inside compose file

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 <service>
#or
docker-compose run <service> -e PORT=443