Curious. I run the docker image all the time and haven't had any issues with the port binding. What kind of system are you using? and what was your launch comma

Curious. I run the docker image all the time and haven't had any issues with the port binding. What kind of system are you using? and what was your launch command? You can double check that we are exposing port 3000 from the container which is where the app is designed to run by default. The Dockerfile used to build the image is in our repo here: https://github.com/metabase/metabase/blob/master/bin/release/dockerhub/Dockerfile https://github.com/metabase/metabase/blob/master/bin/release... Heroku sometimes times out if the application takes too long to start. Could you try again and see if it works? We're working on making Heroku deploys more robust.