How to push Docker containers managed by Docker-compose to Heroku?

Question

I currently have a locally tested and working web app that consists of 4 docker containers: Java MVC, NodeJS, Flask, and MongoDB. I have 4 Dockerfiles, one for each, and I manage the builds with docker-compose.yml.

However, now I want to push my code to Heroku and I read the documentation at https://devcenter.heroku.com/articles/container-registry-and-runtime. However, it seems very ambigious about how to use docker-compose on the production line. This is what it says on the docs:

"If you’ve created a multi-container application you can use Docker Compose to define your local development environment. Learn how to use Docker Compose for local development."

Can anyone guide me to some actual code of how I can push my project to the Heroku Container using Heroku's CLI?

Answer 1

Just an update on this question since it seems to be getting a lot of traction lately.

There is now an officially supported "Heroku.yml" solution offered by Heroku. You can now write a .yml file (with a format similar to docker-compose) and Heroku will work out your images. Just follow the link above for details.

Happy Heroku-ing.