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kubernetes hpa

admin 11月 13, 2020 0

查看帮助

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kubectl explain hpa

先创建一个有资源限制的pod

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kubectl run myapp --image=ikubernetes/myapp:v1 --replicas=1 --requests='cpu=50m,memory=256Mi' --limits='cpu=50m,memory=256Mi' --labels='app=myapp' --expose --port=80

创建一个HPA

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kubectl autoscale --help  //查看帮助
 
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kubectl autoscale deployment myapp --min=1 --max=8 --cpu-percent=60
 
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kubectl patch svc myapp -p '{"spec":{"type":"NodePort"}}'
 
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kubectl get svc  //查看这个服务端口
 
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yum install -y httpd-tools
ab -c 1000 -n 500000 http://IP:PORT/index.html

查看效果

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kubectl  get pods
kubectl describe hpa

vim myapp-hpa-demo.yaml

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apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: mapp-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: myapp
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      targetAverageUtilization: 55
  - type: Resource
    resource:
      name: memory
      targetAverageValue: 50Mi

应用这些文件

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kubectl apply -f myapp-hpa-demo.yaml

压测

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yum install -y httpd-tools
ab -c 1000 -n 500000 http://IP:PORT/index.html

查看效果

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kubectl  get pods
kubectl describe hpa

可以看到会自动扩展

比如其他的指标

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apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: mapp-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: myapp
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Pods
    pods:
      metricName: http_requests
      targetAverageValue: 800m
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