CODEWITHSUNDEEP
dockerdocker-compose
Golo Roden
Golo Roden

Reputation: 150624

Set the port for docker-compose.yml at runtime

I have a docker-compose.yml file in one of my projects where I link multiple containers to build one application. The main entry point (i.e. a container with a web server) is run on host port 8080.

Now this port is hard-coded into the docker-compose.yml file.

Is there a way to dynamically set this port using runtime parameters? I could not find anything on this in the documentation, but on the other hand I can not imagine that this should not be possible.

Is it?

Upvotes: 13

Views: 6799

Answers (2)

Ismail
Ismail

Reputation: 743

If you want to expose a port dynamically from compose ports directive, you can use environment variables in said directive, making sure you actually have those variables loaded for docker engine, example:

# docker-compose.yml
version: '3'

services:
  abcservice:
    ports:
      - "${ENV_API_PORT}:3000"

# .env
ENV_API_PORT=8082

To load those variables for docker engine, pass the .env file reference via --env-file option instead of loading them into your shell:

docker-compose --env-file .env up

And so make sure to always pass that option when calling docker-compose commands.

Upvotes: 0

Troy Kelley
Troy Kelley

Reputation: 114

This question is super old, but it's been viewed a bunch of times so I'll post the link to the docs for using environment variables:

https://docs.docker.com/compose/environment-variables/

Upvotes: 2

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