kubernetes自动伸缩

• pod与节点度量数据由cAdvisor获取，并由集群级组件Heapster聚合。HPA控制器向Heapster发起REST调用来获取所有pod度量数据。

• autoscaler控制器通过scale子资源来修改被伸缩资源的replicas字段。
• 暴露Scale子资源
  • Deployment
  • ReplicaSet
  • ReplicationController
  • StatefulSet

apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: kubia
  namespace: service
  labels:
    app: xxx
    version: v0.0.1
spec:
  scaleTargetRef:
    apiVersion: extensions/v1beta1
    kind: Deployment
    name: xxx
  minReplicas: 1
  maxReplicas: 5
  metrics:
  - type: Resource
    resource:
      name: cpu
      targetAverageUtilization: 30
  - type: Resource
    resource:
      name: memory
      targetAverageUtilization: 40