Cloud Intermediate

Horizontal Pod Autoscaler¶

KubernetesAutoscalingHPA 3 min read

Automatic pod scaling based on CPU, memory or custom metrics.

Basic HPA¶

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: api-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: api
  minReplicas: 2
  maxReplicas: 20
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 70
    - type: Resource
      resource:
        name: memory
        target:
          type: Utilization
          averageUtilization: 80

Custom Metrics¶

With Prometheus Adapter you can scale based on HTTP request rate, queue depth, etc.

Summary¶

HPA is the foundation of autoscaling. Always set requests (HPA needs them). Minimum 2 replicas for HA.

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