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This example demo the Horizontal Pod Autoscaler (HPA) using Terraform

The K8S Resources are created following this document: https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/

Step to trigger the HPA

  1. Install the metrics server ``bash $ kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/high-availability-1.21+.yaml
1. Trigger HPA by increase workload in exisitng Pods

```bash
$ kubectl run -i --tty load-generator --rm --image=busybox:1.28 --restart=Never -- /bin/sh -c "while sleep 0.01; do wget -q -O- http://php-apache; done"

At the same time, monitor the HPA status by running the following command:

$ watch kubectl get hpa

The HPA will scale up the Pods (max 10 replicas) until the average CPU utilization of the Pods is below target (50%).

  1. It will automatically scale down the Pods when the average CPU utilization is below target (50%).
$ kubectl delete pod load-generator

HPA will scale down the Pods to the minimum replicas.