kubernetes(K8S)HPA集群

[root@master ~]# vim myhpa.yaml 
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myweb
spec:
  selector:
    matchLabels:
      app: apache
  replicas: 1
  template:
    metadata:
      labels:
        app: apache
    spec:
      containers:
      - name: apache
        image: 192.168.1.100:5000/myos:httpd
        ports:
        - containerPort: 80
        resources:
          requests:
            cpu: 200m
      restartPolicy: Always

---
apiVersion: v1
kind: Service
metadata:
  name: web-service
spec:
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
  selector:
    app: apache
  type: ClusterIP

---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: my-app
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  backend:
    serviceName: web-service
    servicePort: 80

---
apiVersion: autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
  name: myweb
spec:
  minReplicas: 1
  maxReplicas: 3
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: myweb
  targetCPUUtilizationPercentage: 50
[root@master ~]# kubectl apply -f hpa-example.yaml
[root@master ~]# kubectl get hpa
NAME    REFERENCE          TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
myweb   Deployment/myweb   0%/50%    1         3         1          15m

当容器的cpu占用超过 50% 的时候，自动扩展一个POD，依次扩展，一直到最大值
如果cpu访问不足 50% 的时候，每 300s 缩减一个 POD 节点，直到最小值时停止
访问测试可以使用镜像内提供的 info.php增加系统负载，从而查看状态信息
访问地址 http://ip.xx.xx.xx/info.php?id=1000000
id 为计算结果集的数量，id 越大，占用内存和CPU越高，设置特别大容易死机