# Flask on Heroku ### Remember to setup buildpack - Heroku Dashboard -> Settings -> Buildpacks - `requirements.txt` is required in your project (otherwise, deployment will failed)：better to use pipenv: `pipenv lock --requirements > requirements.txt` ### Webserver - `gunicorn` recommended： `pipenv install gunicorn` > note: run gunicorn locally: `pipenv run gunicorn #{your_app_name}:app` - Create a file called `Procfile` on the root path in your project - Add the following contents to Procfile: ``` web: gunicorn main:app ``` > What will Procfile do? > Heroku apps include a Procfile that specifies the commands that are executed by the app on startup. > A Procfile declares its process types on individual lines, each with the following format: > ``` > <process type>: <command> > ``` - Don't forget to scale up dynos: `heroku ps:scale web=1` ### Deploy ``` git push heroku master ```