Horizontal Pod Autoscaling (HPA)

Install Metrics Server

Metrics Server collects resource metrics from Kubelets and exposes them in Kubernetes apiserver through Metrics API for use by Horizontal Pod Autoscaler and Vertical Pod Autoscaler. Metrics API can also be accessed by kubectl top, making it easier to debug autoscaling pipelines.

helm repo add metrics-server https://kubernetes-sigs.github.io/metrics-server/
helm upgrade --install metrics-server metrics-server/metrics-server -n kube-system

HPA Resource

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: skills
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: skills
  minReplicas: 2
  maxReplicas: 20
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 50
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 60