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Presentation Script

This script lists some of the commands and actions I may or may not perform during a live demo of the Pi Dramble.

Demonstrate Ansible's remote control using the Blinksticks

  1. ansible -i inventory all -m service -a "name=dramble-node-monitor state=stopped" -b
  2. ansible -i inventory all -a "blinkstick blue" -b
  3. ansible -i inventory all -a "blinkstick green" -b

Ansible Encounters of the Third Kind

  1. ansible-playbook -i inventory testing/presentation/ansible-encounters/main.yml (This re-enables dramble-node-monitor automatically).

Demonstrate Kubernetes self-healing

  1. kubectl get pods -o wide --all-namespaces (maybe even add filter to just show kube3 pods)
  2. ssh [email protected] (kube3)
  3. sudo systemctl stop kubelet
  4. (Observe red LED on 3rd Pi)
  5. watch kubectl get nodes (to see how long it takes the Kubernetes master to mark node as NotReady)
  6. watch kubectl get pods --all-namespaces -o wide (to see when the Pods on kube3 get shuffled)

Note: The default toleration timeout for Deployments in the Pi Dramble is set to 300s. For presentations, this should be overridden so it is 30s, by deploying with the following variable in config.yml: kubernetes_toleration_not_ready: 30.

Demonstrate Kubernetes Horizontal Pod Autoscaling (HPA)

  1. watch kubectl get hpa -n drupal
  2. Start hammering Drupal in new window: wrk -c 5 -d 120 -t 5 http://cluster.pidramble.test/
  3. (Wait a minute or so)
  4. Once pods start scaling up: watch kubectl get pods -n drupal -o wide

Note: By default, the HPA has a 5-minute cool-down period. I don't think it's as important to demo the scale-down timings... but if I wanted to I would probably want to change that to 30s or 60s max.