Port Issue: Deploy Streamlit app to Heroku by Docker Containners

🚀 Deployment
2

Hey @tourist-C

Heroku exposes the available port with the PORT environment variable so you need to use this in your Dockerfile,

CMD ["sh", "-c", "streamlit run --server.port $PORT path_to_your_main.py"]

And you can add this in your docker-compose so that you wont have to change it at the time of deployment,

environment:
            - PORT=8000

Hope it helps !

Also this might help, Deploying Streamlit Apps with Docker on Heroku

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