Kubernetes Horizontal Pod Autoscaling

Description:

• Horizontal Scaling
• HPA updates a workload resource to match demand
  • by depploying more/less pods
• doesnt apply for objects that cant be scaled, ex: Kubernetes DaemonSet
• runs inside Kubernetes Control Plane
• Controlled by HPA controller
• kubectl get hpa

How does HPA work:

• the interval is set by --horizontal-pod-autoscaler-sync-period parameter to the kube-controller-manager (and the default interval is 15 seconds).
• metrics-server is required
  • hpa checks with metrics server for data

Pod readiness and autoscaling metrics:

• .
  • HPA controller
• Key behaviours for pod readiness
• good practice for pod readiness