instruction: Create a Dockerfile for fundamentals
output: ```dockerfile
  from your
  configured registry, as though you had run docker pull ubuntu manually.Docker creates a new container, as though you had run a docker container create
  command manually.Docker allocates a read-write filesystem to the container, as its final
  layer. This allows a running container to create or modify files and
  directories in its local filesystem.Docker creates a network interface to connect the container to the default
  network, since you didn't specify any networking options. This includes
  assigning an IP address to the container. By default, containers can
  connect to external networks using the host machine's network connection.Docker starts the container and executes /bin/bash. Because the container
  is running interactively and attached to your terminal (due to the -i and -t
  flags), you can provide input using your keyboard while Docker logs the output to
  your terminal.When you run exit to terminate the /bin/bash command, the container
  stops but isn't removed. You can start it again or remove it.The underlying technologyDocker is written in the Go programming language and takes
  advantage of several features of the Linux kernel to deliver its functionality.
  Docker uses a technology called namespaces to provide the isolated workspace
  called the container. When you run a container, Docker creates a set of
  namespaces for that container.These namespaces provide a layer of isolation. Each aspect of a container runs
  in a separate namespace and its access is limited to that namespace.Next stepsInstall DockerGet started with Docker
  Request changesTable of contentsThe Docker platformWhat can I use Docker for?Fast, consistent delivery of your applicationsResponsive deployment and scalingRunning more workloads on the same hardwareDocker architectureThe Docker daemonThe Docker clientDocker DesktopDocker registriesDocker objectsThe underlying technologyNext steps
  
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