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OPS635 Docker Lab: Cluster Management Using Docker


Deploying services as containers in a swarm can make it easy to rapidly deploy it across your network, and to scale it up and down as needed.


  • You must have an installed host, with at least three virtual machines.
  • Each machine must be running an up-to-date version of CentOS.


  • One Solid State Drive (SSD), minimum capacity 240GB, in a USB3 Enclosure.

Investigation 1: Running Docker Containers

  • Install Docker on one of your virtual machines.
    • Note: Do not use Docker on your host, as it may interfere with other services covered in this course.
    • Note2: Do not install Docker from the default CentOS repository! Refer to your lecture notes and slides for the current correct method.
  • Run the 'hello-world' image to ensure your installation is working.
    • Feel free to remove the container and image afterwards.

Investigation 2: Deploying a Container From a Custom Image

  • Run a container using the existing image for httpd.
    • Make some changes to the index.html file by using docker exec (The exact content is not important just include some text that says ‘version 1’, I just want to see that you can modify it).
  • Commit these changes and push your image to docker hub with the tag v1.

Investigation 3: Managing how images are deployed

  • Write a compose file that will deploy one copy of your container onto each of your machines.


  1. Demonstrate your Swarm working in class.
  2. Upload your Compose file to Blackboard.