DOCKER_KATAS

app.py

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello! I am a Flask application'

if __name__ == '__main__':
    # Note the extra host argument. If we didn't have it, our Flask app
    # would only respond to requests from inside our container
    app.run(host='0.0.0.0')

Dockerfile

  # The base image
  FROM ubuntu:latest

  # Install python and pip
  RUN apt-get update -y
  RUN apt-get install -y python-pip python-dev build-essential

  # Install Python modules needed by the Python app
  COPY requirements.txt /usr/src/app/
  RUN pip install --no-cache-dir -r /usr/src/app/requirements.txt

  # Copy files required for the app to run
  COPY app.py /usr/src/app/

  # Declare the port number the container should expose
  EXPOSE 5000

  # Run the application
  CMD ["python", "/usr/src/app/app.py"]

requirements.txt

Flask==0.12.3