docker - How do I expose ports on Heroku with a Dockerfile?

Question

I am trying to deploy a Docker image on Heroku and am trying to understand how to expose multiple ports. Here is the Docker command that I am trying to run in the Heroku deploy:

docker run 
    -p 2222:22 
    -p 33306:3306 
    -p 27017:27017 
    -p 28015:28015 
    -p 29015:29015 
    -p 8080:8080 
    test/db-migration

How do I do this in Heroku?

Answer 1

You can't - you should use the $PORT environment variable which will be randomly assigned and then mapped to port 80 by the Heroku routers. Also, only http requests are accepted. See https://devcenter.heroku.com/articles/container-registry-and-runtime#dockerfile-commands-and-runtime for more details.