A basic Flask App

Run with virtualenv

Create a virtualenv folder virtualenv -p python3 venv
Activate source venv/bin/activate
Install the requirements pip install -r requirements.txt
Run gunicorn gunicorn app:app --bind 0.0.0.0:5000 --reload

Run with Docker

Build the image with docker build -t hello-app .
Run the container with docker run -d -p 5000:5000 -e PORT=5000 --name hello-server hello-app
Check that the container is running
Go to localhost:5000. You should see Hello, World!