Horizontal Pod Autoscaler

Jan 1, 0001

Definition

The Horizontal Pod Autoscaler (HPA) is a Kubernetes feature that automatically adjusts the number of pods in a deployment, replication controller, or replica set based on observed CPU utilization or other select metrics. It helps maintain application performance and resource efficiency by scaling out or in according to demand, ensuring that the application can handle varying loads without manual intervention.

Secure Settings Example

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: secure-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: my-secure-app
  minReplicas: 2
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 70
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 300
      policies:
      - type: Percent
        value: 10
        periodSeconds: 60
    scaleUp:
      stabilizationWindowSeconds: 0
      policies:
      - type: Percent
        value: 50
        periodSeconds: 60

Insecure Settings Example

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: insecure-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: my-insecure-app
  minReplicas: 0
  maxReplicas: 100
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 90