Kubernetes Cookbook - Second Edition

Horizontal Pod Autoscaler (HPA)

An HPA queries the source of metrics periodically and determines whether scaling is required by a controller based on the metrics it gets. There are two types of metrics that could be fetched; one is from Heapster (https://github.com/kubernetes/heapster), another is from RESTful client access. In the following example, we'll show you how to use Heapster to monitor Pods and expose the metrics to an HPA.

First, Heapster has to be deployed in the cluster:

If you're running minikube, use the minikube addons enable heapster command to enable heapster in your cluster. Note that minikube logs | grep heapster command could also be used to check the logs of heapster.

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