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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-system
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
kubernetes-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/v1beta1
kind: CronHorizontalPodAutoscaler
metadata:
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-basic
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx-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-sample
Namespace: default
Labels: controller-tools.k8s.io=1.0
Annotations: kubectl.kubernetes.io/last-applied-configuration:
{apiVersion : autoscaling.alibabacloud.com/v1beta1 , kind : CronHorizontalPodAutoscaler , metadata :{ annotations :{}, labels :{ controll...
API Version: autoscaling.alibabacloud.com/v1beta1
Kind: CronHorizontalPodAutoscaler
Metadata:
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: 05e41c95-5ea2-11e9-8ce6-00163e12e274
Spec:
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-basic
Status:
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: Submitted
Events: none
4. 等待一段时间,查看 cronhpa 的运行状态
kubernetes-cronhpa-controller git:(master) kubectl describe cronhpa cronhpa-sample
Name: cronhpa-sample
Namespace: default
Labels: controller-tools.k8s.io=1.0
Annotations: kubectl.kubernetes.io/last-applied-configuration:
{apiVersion : autoscaling.alibabacloud.com/v1beta1 , kind : CronHorizontalPodAutoscaler , metadata :{ annotations :{}, labels :{ controll...
API Version: autoscaling.alibabacloud.com/v1beta1
Kind: CronHorizontalPodAutoscaler
Metadata:
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-00163e30eb10
Spec:
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-basic
Status:
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: Submitted
Events:
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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