HPA

HPA

• v1.16 后允许 minReplicas=0
• https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.27/#horizontalpodautoscaler-v2-autoscaling
• metrics
  • type - ContainerResource, External, Object, Pods, Resource
  • containerResource
    • 可以选择目标 container
  • resource
• target
  • type - Utilization, Value, AverageValue
  • averageUtilization - 所有 Pod - 只能 Resource
  • averageValue
• behavior - scaleDown, scaleUp
  • policies
    • periodSeconds
      • 0-1800
  • selectPolicy=Max
  • stabilizationWindowSeconds
    • 0-3600
    • up 默认 0
    • down 默认 300 - 5 分钟

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: server
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: server
  minReplicas: 2
  maxReplicas: 10
  metrics:
  - type: Resource # Resource、Pods、Object、External
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 50

desiredReplicas = ceil[currentReplicas * ( currentMetricValue / desiredMetricValue )]