k8s资源之hpa

发布一个k8s部署视频：https://edu.csdn.net/course/detail/26967

课程内容：各种k8s部署方式。包括minikube部署，kubeadm部署，kubeasz部署，rancher部署，k3s部署。包括开发测试环境部署k8s，和生产环境部署k8s。

腾讯课堂连接地址https://ke.qq.com/course/478827?taid=4373109931462251&tuin=ba64518

第二个视频发布  https://edu.csdn.net/course/detail/27109

介绍主要的k8s资源的使用配置和命令。包括configmap，pod，service，replicaset，namespace，deployment，daemonset，ingress，pv，pvc，sc，role，rolebinding，clusterrole，clusterrolebinding，secret，serviceaccount，statefulset，job，cronjob，podDisruptionbudget，podSecurityPolicy,networkPolicy,resourceQuota，limitrange，endpoint，event，conponentstatus，node，apiservice，controllerRevision等。

第四个课程发布：https://edu.csdn.net/course/detail/28488

本课程将详细介绍k8s所有命令，以及命令的go源码分析，学习知其然，知其所以然

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Api版本：

•autoscaling/v1                 #只支持通过cpu为参考依据，来改变pod副本数

autoscaling/v2beta1       #支持通过cpu、内存、连接数以及用户自定义的资源指标数据为参考依据。
autoscaling/v2beta2       #同上，小的变动

targetAverageUtilization：

[root@master01 targetCPUUtilizationPercentage]# cat ./*
apiVersion: autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
  name: nginx-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: nginx-deployment
  minReplicas: 1
  maxReplicas: 5
  targetCPUUtilizationPercentage: 50

apiVersion: v1
kind: Service
metadata:
  name: nginx-clusterip-svc
spec:
 selector:  
   app: nginx
 type: ClusterIP
 ports:
 -  name: http
    port: 8000      
    targetPort: 80
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
        resources:
          requests:
            cpu: 0.01
          limits:
            cpu: 0.01

targetAverageValue：

[root@master01 targetAverageValue]# cat ./*
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: tomcat-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: tomcat-deployment
  minReplicas: 1
  maxReplicas: 5
  metrics:
  - type: Resource
    resource:
      name: cpu
      targetAverageValue: 80m
  - type: Resource
    resource:
      name: memory
      targetAverageValue: 150Mi
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deployment
  labels:
    app: tomcat
spec:
  selector:
    matchLabels:
      app: tomcat
  replicas: 2
  template:
    metadata:
      labels:
        app: tomcat
    spec:
      containers:
      - name: tomcat
        image: tomcat
        ports:
        - containerPort: 8080
        resources:
          requests: 
            cpu: 0.1
            memory: 100Mi
          limits:
            cpu: 0.2
            memory: 200Mi

apiVersion: v1
kind: Service
metadata:
  name: tomcat-clusterip-svc
spec:
 selector:  
   app: tomcat
 type: ClusterIP
 ports:
 -  name: http
    port: 8000      
    targetPort: 8080

targetAverageUtilization：

 

[root@master01 targetAverageUtilization]# cat ./*
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: tomcat-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: tomcat-deployment
  minReplicas: 1
  maxReplicas: 5
  metrics:
  - type: Resource
    resource:
      name: cpu
      targetAverageUtilization: 80
  - type: Resource
    resource:
      name: memory
      targetAverageUtilization: 150
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tomcat-deployment
  labels:
    app: tomcat
spec:
  selector:
    matchLabels:
      app: tomcat
  replicas: 2
  template:
    metadata:
      labels:
        app: tomcat
    spec:
      containers:
      - name: tomcat
        image: tomcat
        ports:
        - containerPort: 8080
        resources:
          requests: 
            cpu: 0.1
            memory: 100Mi
          limits:
            cpu: 0.2
            memory: 200Mi

apiVersion: v1
kind: Service
metadata:
  name: tomcat-clusterip-svc
spec:
 selector:  
   app: tomcat
 type: ClusterIP
 ports:
 -  name: http
    port: 8000      
    targetPort: 8080

replicaset：

[root@master01 replicaset]# cat ./*
apiVersion: autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
  name: frontend-hpa
  labels:
    software: apache
    project: frontend
    app: hpa
    version: v1
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: ReplicaSet
    name: frontend
  minReplicas: 1
  maxReplicas: 5
  targetCPUUtilizationPercentage: 30

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: frontend
  labels:
    app: guestbook
    tier: frontend
spec:
  # this replicas value is default
  # modify it according to your case
  replicas: 3
  selector:
    matchLabels:
      tier: frontend
    matchExpressions:
      - {key: tier, operator: In, values: [frontend]}
  template:
    metadata:
      labels:
        app: guestbook
        tier: frontend
    spec:
      containers:
      - name: php-redis
        image: iaasfree/gb-frontend:v3 
        resources:
          requests:
            cpu: 10m
            memory: 10Mi
        env:
        - name: GET_HOSTS_FROM
          value: dns
          # If your cluster config does not include a dns service, then to
          # instead access environment variables to find service host
          # info, comment out the 'value: dns' line above, and uncomment the
          # line below.
          # value: env
        ports:
        - containerPort: 80
apiVersion: v1
kind: Service
metadata:
  name: frontend-svc
spec:
 selector:  
   tier: frontend
 type: ClusterIP
 ports:
 -  name: http
    port: 8000      
    targetPort: 80

 

Prometheus：

参考：https://github.com/stefanprodan/k8s-prom-hpa