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 

Answer 2

You can use the flag when using docker-compose build

docker-compose build --build-arg PRODUCTION=VALUE 

In Dockerfile you can get the argument PRODUCTION

# Dockerfile ARG PRODUCTION FROM node:latest