apiVersion: apps/v1 kind: Deployment metadata: name: test-hpa labels: app: test-app spec: replicas: 1 selector: matchLabels: app: test-app template: metadata: labels: app: test-app spec: containers: - image: skto/sample-app:v2 name: metrics-provider ports: - name: http containerPort: 8080 --- apiVersion: v1 kind: Service metadata: name: test-app namespace: default labels: app: test-app spec: ports: - port: 8080 name: http protocol: TCP targetPort: 8080 selector: app: test-app type: ClusterIP --- apiVersion: apps/v1 kind: Deployment metadata: name: sample-app labels: app: sample-app spec: replicas: 1 selector: matchLabels: app: sample-app template: metadata: labels: app: sample-app spec: containers: - image: skto/sample-app:v2 name: metrics-provider ports: - name: http containerPort: 8080 --- apiVersion: v1 kind: Service metadata: name: sample-app namespace: default labels: app: sample-app spec: ports: - port: 80 name: http protocol: TCP targetPort: 8080 selector: app: sample-app type: ClusterIP --- apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: test-ingress namespace: default spec: ingressClassName: nginx rules: - host: test.example.com http: paths: - backend: service: name: sample-app port: number: 80 path: / pathType: ImplementationSpecific - backend: service: name: test-app port: number: 8080 path: /home pathType: ImplementationSpecific

创建external类型的apiservices资源；创建后apiservices的状态为false是正常现象，添加externalRules后状态变为true

apiVersion: apiregistration.k8s.io/v1 kind: APIService metadata: name: v1beta1.external.metrics.k8s.io spec: group: external.metrics.k8s.io groupPriorityMinimum: 100 insecureSkipTLSVerify: true service: #指定prometheus-adapter对应的service，华为CCE插件中adapter名称为custom-metrics-apiserver name: custom-metrics-apiserver namespace: monitoring port: 443 version: v1beta1 versionPriority: 100

将externalRules规则添加到adapter的configmap中，修改后需要重启prometheus-adapter服务

kubectl -n monitoring edit configmap user-adapter-config

externalRules: - metricsQuery: sum(rate(<<.Series>>{<<.LabelMatchers>>}[2m])) by (<<.GroupBy>>) name: as: ${1}_per_second matches: ^(.*) resources: namespaced: false #忽略指标来源的命名空间，该配置不适用rules规则 seriesQuery: nginx_ingress_controller_requests

 

seriesQuery：原始指标；可以直接写指标名称，也可以使用{labelKey=labelValue}的方式筛选出原始指标

metricsQuery：用PromQL对指标进行筛选汇聚；.Series表示原始指标，.LabelMatchers表示对指标进行标签筛选，hpa中可以配置具体的筛选规则

name：将指标重命名

resources：hpa查询指标时通过api的方式调用，调用路径为：

 

custom-metrics-apiserver服务重启后需要等待1分钟左右，执行命令查看指标是否正常

kubectl get --raw /apis/external.metrics.k8s.io/v1beta1/namespaces/*/nginx_ingress_controller_requests_per_second

创建HPA规则

apiVersion: autoscaling/v2 kind: HorizontalPodAutoscaler metadata: name: sample-hpa spec: scaleTargetRef: apiVersion: apps/v1 kind: Deployment name: sample-app minReplicas: 1 maxReplicas: 10 metrics: - type: External external: metric: name: nginx_ingress_controller_requests_per_second selector: matchLabels: #可以通过该字段对指标进行过滤，这里标签筛选条件会加入到externalRules的<<.LabelMatchers>>中。 exported_service: sample-app #筛选后端服务为sample-app的请求 host: test.example.com #筛选访问域名为test.example.com的请求 target: type: AverageValue #External指标类型下只支持Value和AverageValue类型的目标值。 averageValue: 30 --- apiVersion: autoscaling/v2 kind: HorizontalPodAutoscaler metadata: name: test-hpa spec: scaleTargetRef: apiVersion: apps/v1 kind: Deployment name: test-app minReplicas: 1 maxReplicas: 10 metrics: - type: External external: metric: name: nginx_ingress_controller_requests_per_second selector: matchLabels: exported_service: test-app host: test.example.com target: type: AverageValue averageValue: 30

弹性演示

使用命令压测sample-app对应的访问域名和路径，正常触发弹性；请自行配置域名与ELB地址的映射

ab -c 50 -n 5000 http://test.example.com/

用同样的方式压测test-app，正常触发弹性

ab -c 50 -n 5000 http://test.example.com/home

 

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