Ansible 101 - on a Cluster of Raspberry Pi 2s
Over the course of this year, I've acquired six Raspberry Pi model 2 B computers, and configured them in a cluster (or 'bramble') so I can use them to test different infrastructure configurations, mostly for running Drupal 8. All the Ansible playbooks and instructions for building the cluster are available on the GitHub project page for the Raspberry Pi Dramble.
Each Raspberry Pi has its own RGB LED board that's wired into the GPIO pins, so they're controlled by software. I can demonstrate different ways of managing the cluster via Ansible, and I finally took the time to make a video, Ansible 101 - on a cluster of Raspberry Pi 2s, which shows how it all works together: