Kubernetes的cronhpa怎么安装使用

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使用方式

cronhpa 是基于 CRD 的方式开发的 controller，使用 cronhpa 的方式非常简单，整体的使用习惯也尽可能的和 HPA 保持一致。代码仓库地址

1. 安装 CRD

kubectl apply -f config/crds/autoscaling_v1beta1_cronhorizontalpodautoscaler.yaml

2. 安装 RBAC 授权

# create ClusterRole kubectl apply -f config/rbac/rbac_role.yaml# create ClusterRolebinding and ServiceAccount kubectl apply -f config/rbac/rbac_role_binding.yaml

3. 部署 kubernetes-cronhpa-controller

kubectl apply -f config/deploy/deploy.yaml

4. 验证 kubernetes-cronhpa-controller 安装状态

kubectl get deploy kubernetes-cronhpa-controller -n kube-system -o wide kubernetes-cronhpa-controller git:(master)  kubectl get deploy kubernetes-cronhpa-controller -n kube-systemNAME                            DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGEkubernetes-cronhpa-controller   1         1         1            1           49s

运行一个 cronhpa 的 demo

安装了 kubernetes-cronhpa-controller 后，我们可以通过一个简单的 demo 进行功能的验证。在部署前，我们先看下一个标准的 cronhpa 的定义。

apiVersion: autoscaling.alibabacloud.com/v1beta1kind: CronHorizontalPodAutoscalermetadata:  labels:    controller-tools.k8s.io: "1.0"  name: cronhpa-sample  namespace: default spec:   scaleTargetRef:      apiVersion: apps/v1beta2      kind: Deployment      name: nginx-deployment-basic   jobs:   - name: "scale-down"     schedule: "30 */1 * * * *"     targetSize: 1   - name: "scale-up"     schedule: "0 */1 * * * *"     targetSize: 3

其中 scaleTargetRef 字段负责描述伸缩的对象，jobs 中定义了扩展的 crontab 定时任务。在这个例子中，设定的是每分钟的第 0 秒扩容到 3 个 Pod，每分钟的第 30s 缩容到 1 个 Pod。如果执行正常，我们可以在 30s 内看到负载数目的两次变化。

1. 部署 demo 应用与 cronhpa 的配置

kubectl apply -f examples/deployment_cronhpa.yaml

2. 检查 demo 应用副本数目

kubectl get deploy nginx-deployment-basic kubernetes-cronhpa-controller git:(master)  kubectl get deploy nginx-deployment-basicNAME                     DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGEnginx-deployment-basic   2         2         2            2           9s

3. 查看 cronhpa 的状态 ，确认 cronhpa 的 job 已提交

kubectl describe cronhpa cronhpa-sample Name:         cronhpa-sampleNamespace:    defaultLabels:       controller-tools.k8s.io=1.0Annotations:  kubectl.kubernetes.io/last-applied-configuration:                {"apiVersion":"autoscaling.alibabacloud.com/v1beta1","kind":"CronHorizontalPodAutoscaler","metadata":{"annotations":{},"labels":{"controll...API Version:  autoscaling.alibabacloud.com/v1beta1Kind:         CronHorizontalPodAutoscalerMetadata:  Creation Timestamp:  2019-04-14T10:42:38Z  Generation:          1  Resource Version:    4017247  Self Link:           /apis/autoscaling.alibabacloud.com/v1beta1/namespaces/default/cronhorizontalpodautoscalers/cronhpa-sample  UID:                 05e41c95-5ea2-11e9-8ce6-00163e12e274Spec:  Jobs:    Name:         scale-down    Schedule:     30 */1 * * * *    Target Size:  1    Name:         scale-up    Schedule:     0 */1 * * * *    Target Size:  3  Scale Target Ref:    API Version:  apps/v1beta2    Kind:         Deployment    Name:         nginx-deployment-basicStatus:  Conditions:    Job Id:           38e79271-9a42-4131-9acd-1f5bfab38802    Last Probe Time:  2019-04-14T10:43:02Z    Message:    Name:             scale-down    Schedule:         30 */1 * * * *    State:            Submitted    Job Id:           a7db95b6-396a-4753-91d5-23c2e73819ac    Last Probe Time:  2019-04-14T10:43:02Z    Message:    Name:             scale-up    Schedule:         0 */1 * * * *    State:            SubmittedEvents:               

4. 等待一段时间，查看 cronhpa 的运行状态

kubernetes-cronhpa-controller git:(master) kubectl describe cronhpa cronhpa-sampleName:         cronhpa-sampleNamespace:    defaultLabels:       controller-tools.k8s.io=1.0Annotations:  kubectl.kubernetes.io/last-applied-configuration:                {"apiVersion":"autoscaling.alibabacloud.com/v1beta1","kind":"CronHorizontalPodAutoscaler","metadata":{"annotations":{},"labels":{"controll...API Version:  autoscaling.alibabacloud.com/v1beta1Kind:         CronHorizontalPodAutoscalerMetadata:  Creation Timestamp:  2019-04-15T06:41:44Z  Generation:          1  Resource Version:    15673230  Self Link:           /apis/autoscaling.alibabacloud.com/v1beta1/namespaces/default/cronhorizontalpodautoscalers/cronhpa-sample  UID:                 88ea51e0-5f49-11e9-bd0b-00163e30eb10Spec:  Jobs:    Name:         scale-down    Schedule:     30 */1 * * * *    Target Size:  1    Name:         scale-up    Schedule:     0 */1 * * * *    Target Size:  3  Scale Target Ref:    API Version:  apps/v1beta2    Kind:         Deployment    Name:         nginx-deployment-basicStatus:  Conditions:    Job Id:           84818af0-3293-43e8-8ba6-6fd3ad2c35a4    Last Probe Time:  2019-04-15T06:42:30Z    Message:          cron hpa job scale-down executed successfully    Name:             scale-down    Schedule:         30 */1 * * * *    State:            Succeed    Job Id:           f8579f11-b129-4e72-b35f-c0bdd32583b3    Last Probe Time:  2019-04-15T06:42:20Z    Message:    Name:             scale-up    Schedule:         0 */1 * * * *    State:            SubmittedEvents:  Type    Reason   Age   From                            Message  ----    ------   ----  ----                            -------  Normal  Succeed  5s    cron-horizontal-pod-autoscaler  cron hpa job scale-down executed successfully

此时可以在 event 中发现负载的定时伸缩已经生效。

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