hpa实战

1.部署修仙业务，要求副本数量为1;
2.使用ab测试工具对修仙业务进行压力测试;
3.请实现Pod水平伸缩，当cpu压力达到95%或者内存达到90%时自动进行扩容pod副本数量(上限数量10)。

	1.编写资源清单
[root@master231 horizontalpodautoscalers]# cat 03-deploy-hpa-xiuxian.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 1
  selector:
    matchLabels:
      apps: xiuxian
  template:
    metadata:
      labels:
        apps: xiuxian
    spec:
      containers:
      - name: c1
        image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1 
        resources:
          requests:
            memory: 100Mi
            cpu: 100m

---

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: hpa-memory
spec:
  minReplicas: 2
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: memory
      target: 
        type: Utilization
        averageUtilization: 90
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: deploy-xiuxian


---

apiVersion: autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
  name: hpa-cpu
spec:
  maxReplicas: 10
  minReplicas: 2
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: deploy-xiuxian
  targetCPUUtilizationPercentage: 95


---

apiVersion: v1
kind: Service
metadata:
  name: svc-xiuxian
spec:
  type: LoadBalancer
  selector:
    apps: xiuxian
  ports:
  - port: 80
[root@master231 horizontalpodautoscalers]# 


	2.创建资源
[root@master231 horizontalpodautoscalers]# kubectl apply -f  03-deploy-hpa-xiuxian.yaml 
deployment.apps/deploy-xiuxian created
horizontalpodautoscaler.autoscaling/hpa-memory created
horizontalpodautoscaler.autoscaling/hpa-cpu created
service/svc-xiuxian created
[root@master231 horizontalpodautoscalers]# 


	3.查看创建的资源
[root@master231 horizontalpodautoscalers]# kubectl get hpa,svc,deploy,po -o wide
NAME                                             REFERENCE                   TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
horizontalpodautoscaler.autoscaling/hpa-cpu      Deployment/deploy-xiuxian   0%/95%    2         10        2          46s
horizontalpodautoscaler.autoscaling/hpa-memory   Deployment/deploy-xiuxian   3%/90%    2         10        2          46s

NAME                  TYPE           CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE    SELECTOR
service/kubernetes    ClusterIP      10.200.0.1    <none>        443/TCP        2d4h   <none>
service/svc-xiuxian   LoadBalancer   10.200.71.3   10.0.0.151    80:14241/TCP   46s    apps=xiuxian

NAME                             READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES                                                      SELECTOR
deployment.apps/deploy-xiuxian   2/2     2            2           46s   c1           registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1   apps=xiuxian

NAME                                  READY   STATUS    RESTARTS   AGE   IP             NODE        NOMINATED NODE   READINESS GATES
pod/deploy-xiuxian-5c66679644-b46sl   1/1     Running   0          46s   10.100.2.211   worker233   <none>           <none>
pod/deploy-xiuxian-5c66679644-fjp7h   1/1     Running   0          31s   10.100.1.171   worker232   <none>           <none>
[root@master231 horizontalpodautoscalers]# 

	
	4.压力测试
[root@harbor250.oldboyedu.com ~]# apt -y install apache2-utils

温馨提示:
	我们的k8s集群可能扛不住100w的请求量，最终报错如下，多重复执行几次即可，看到pod扩容效果即可。

[root@harbor250.oldboyedu.com ~]# ab -n 1000000 -c 100 http://10.0.0.151/
This is ApacheBench, Version 2.3 <$Revision: 1879490 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 10.0.0.151 (be patient)
Completed 100000 requests
apr_socket_recv: Connection reset by peer (104)  # 如果报错该信息，说明服务端扛不住啦！
Total of 138386 requests completed
[root@harbor250.oldboyedu.com ~]# 


	5.再次查看pod数量
如上图所示。


	6.删除资源
[root@master231 horizontalpodautoscalers]# kubectl delete -f 03-deploy-hpa-xiuxian.yaml 
deployment.apps "deploy-xiuxian" deleted
horizontalpodautoscaler.autoscaling "hpa-memory" deleted
horizontalpodautoscaler.autoscaling "hpa-cpu" deleted
service "svc-xiuxian" deleted
[root@master231 horizontalpodautoscalers]#