Exercise: Containerize an App

Containers are a powerful mechanism to reuse code from experts. Test your knowledge of the power of containers in the following exercise by building a container and containerizing an app from scratch!

Instructions

• Create an empty Dockerfile using the touch command
• Use the FROM command and reference the latest version of Python here.
• Include the "Hello World" Flask example as an app within your container
  • Copy any relevant directories and libraries in the Dockerfile
  • Make sure any relevant requirements are installed in the Dockerfile
  • Expose the port from the Flask example oin the Dockerfile - make sure you check which one is used by the example!
  • Have your Dockerfile run the relevant commands for your app
• Build your container
• Run the container, opening up a bash shell
• Verify the correct version of Python is installed: python --version

Tips

Below are potential options for building and running your container.

To build your container, if tagging your container as my-python-app:

• $ docker build -t my-python-app .

To run the container, given my-python-app as the image tag and my-running-app as the container name:

• $ docker run -it --rm --name my-running-app my-python-app