Be sure to have the port 5000 available and connection to the internet to pull the image
docker pull jeanmr/simple_app
docker run -p5000:5000 jeanmr/simple_app
The final result should be in localhost, port 5000
localhost:5000 or http://127.0.0.1:5000/
It can be built again running this inside the folder:
docker build -t jeanmr/simple_app .