基于cpu和内存进行pod扩容，创建hpa

基于cpu和内存进行pod扩容，创建hpa

创建镜像

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mkdir php cd php touch dockerfile touch index.php   vim dockerfile FROM php:5-apache ADD index.php /var/www/html/index.php RUN chmod a+rx index.php     vim index.php <?php $x = 0.0001; for ($i = 0; $i <= 1000000;$i++) { $x += sqrt($x); } echo "OK!"; ?>   docker build -t k8s.gcr.io/hpa-example:v1 .   docker save -o hpa-example.tar.gz k8s.gcr.io/hpa-example:v1

　

创建deployment,service

　

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vim php-apache.yaml apiVersion: apps/v1 kind: Deployment metadata: name: php-apache spec: selector: matchLabels: run: php-apache replicas: 1 template: metadata: labels: run: php-apache spec: containers: - name: php-apache image: k8s.gcr.io/hpa-example:v1 ports: - containerPort: 80 resources: limits: cpu: 500m requests: cpu: 200m   --- apiVersion: v1 kind: Service metadata: name: php-apache labels: run: php-apache spec: ports: - port: 80 selector: run: php-apache     kubectl apply -f php-apache.yaml

　　

创建hpa,基于cpu指标

1）让副本数维持在 1-10 个之间（这里副本数指的是通过 deployment 部署的 pod 的副本数）
2）将所有 Pod 的平均 CPU 使用率维持在 50％（通过 kubectl run 运行的每个 pod 如果是 200
毫核，这意味着平均 CPU 利用率为 100 毫核）

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创建hpa   kubectl autoscale deployment php-apache --cpu-percent=50 --min=1 --max=10   kubectl autoscale deployment php-apache （php-apache 表示 deployment 的名字） -- cpu-percent=50（表示 cpu 使用率不超过 50%） --min=1（最少一个 pod） --max=10（最多 10 个 pod）   [root@master php]# kubectl autoscale deployment php-apache --cpu-percent=50 --min=1 --max=10   horizontalpodautoscaler.autoscaling/php-apache autoscaled You have new mail in /var/spool/mail/root [root@master php]# [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache <unknown>/50% 1 10 0 6s        压力测试   busybox kubectl run v1 -it --image=busybox /bin/sh while true; do wget -q -O- http://php-apache.default.svc.cluster.local; done     kubectl run v2 -it --image=busybox /bin/sh while true; do wget -q -O- http://php-apache.default.svc.cluster.local; done     [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache <unknown>/50% 1 10 0 6s [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache 0%/50% 1 10 1 2m8s You have new mail in /var/spool/mail/root [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache 0%/50% 1 10 1 2m13s [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache 0%/50% 1 10 1 2m15s [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache 179%/50% 1 10 4 2m53s [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache 179%/50% 1 10 4 2m54s [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache 82%/50% 1 10 5 3m8s You have new mail in /var/spool/mail/root [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache 82%/50% 1 10 5 3m11s             停止一个请求，还有一个请求存在，发现pod副本的数量没有降下来   kubectl get pods -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES php-apache-775dff594-48dp8 1/1 Terminating 0 7m8s 192.168.166.147 node1 <none> <none> php-apache-775dff594-6q4tv 1/1 Running 0 6m53s 192.168.166.149 node1 <none> <none> php-apache-775dff594-htfs9 1/1 Terminating 0 6m38s 192.168.166.150 node1 <none> <none> php-apache-775dff594-jct7v 1/1 Running 0 7m8s 192.168.135.17 node3 <none> <none> php-apache-775dff594-jnm54 1/1 Running 0 13m 192.168.166.146 node1 <none> <none> php-apache-775dff594-mth8j 1/1 Running 0 7m8s 192.168.135.16 node3 <none> <none> php-apache-775dff594-qjp9k 1/1 Running 0 6m38s 192.168.135.18 node3 <none> <none> php-apache-775dff594-sbkhq 1/1 Terminating 0 6m7s 192.168.166.151 node1 <none> <none> php-apache-775dff594-wxv4k 1/1 Running 0 6m8s 192.168.135.19 node3 <none> <none> v1 1/1 Running 0 8m19s 192.168.135.15 node3 <none> <none>   发现有的pod在逐渐的删除

　　

 

基于内存指标进行pod的扩容

 

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apiVersion: apps/v1 kind: Deployment metadata: name: nginx-hpa spec: selector: matchLabels: app: nginx replicas: 1 template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 ports: - containerPort: 80 name: http protocol: TCP resources: requests: cpu: 0.01 memory: 25Mi limits: cpu: 0.05 memory: 60Mi --- apiVersion: v1 kind: Service metadata: name: nginx labels: app: nginx spec: selector: app: nginx type: NodePort ports: - name: http protocol: TCP port: 80 targetPort: 80 nodePort: 30080 nginx 的 pod 里需要有如下字段，否则 hpa 会采集不到内存指标 resources: requests: cpu: 0.01 memory: 25Mi limits: cpu: 0.05 memory: 60Mi     创建hpa apiVersion: autoscaling/v2 kind: HorizontalPodAutoscaler metadata: name: nginx-hpa spec: maxReplicas: 10 minReplicas: 1 scaleTargetRef: apiVersion: apps/v1 kind: Deployment name: nginx-hpa metrics: - type: Resource resource: name: memory target: type: Utilization averageUtilization: 60   [root@master mem]# kubectl api-versions|grep auto autoscaling/v1 autoscaling/v2 [root@master mem]# vim mem-hpa.yaml [root@master mem]# kubectl apply -f mem-hpa.yaml Error from server (BadRequest): error when creating "mem-hpa.yaml": HorizontalPodAutoscaler in version "v2" cannot be handled as a HorizontalPodAutoscaler: strict decoding error: unknown field "spec.metrics[0].resource.targetAverageUtilization"   The HorizontalPodAutoscaler "nginx-hpa" is invalid: * spec.metrics[0].resource.target.type: Required value: must specify a metric target type * spec.metrics[0].resource.target.type: Invalid value: "": must be either Utilization, Value, or AverageValue          HorizontalPodAutoscaler in version "v2" cannot be handled as a HorizontalPodAutoscaler   averageUtilization：60 指定 averageUtilization 和所有 pod 的目标平均内存利用率，表示为请求内存的百分比。目标 pod 必须配置内存请求   [root@master mem]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE nginx-hpa Deployment/nginx-hpa 27%/60% 1 10 1 58s   kubectl get pods NAME READY STATUS RESTARTS AGE nginx-hpa-7d44f846d6-fhgkp 1/1 Running 0 11m     登录到上面通过 pod 创建的 nginx，并生成一个文件，增加内存   kubectl exec -it nginx-hpa-7d44f846d6-fhgkp -- /bin/sh dd if=/dev/zero of=/tmp/a   [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE nginx-hpa Deployment/nginx-hpa 91%/60% 1 10 1 3m2s [root@master php]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE nginx-hpa Deployment/nginx-hpa 181%/60% 1 10 2 3m4s   扩展：查看 v2 版本的 hpa 如何定义？ [root@master mem]# kubectl get hpa.v2beta2.autoscaling -o yaml > 1.yaml error: the server doesn't have a resource type "hpa" [root@master mem]# kubectl get hpa.v2.autoscaling -o yaml > 1.yaml