eks-cronjob-to-patch-hpa's Introduction

eks-cronjob-to-patch-hpa

EKS cronjob to patch HPA

1. Install Metric server

kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

# kubectl get deployment metrics-server -n kube-system
NAME             READY   UP-TO-DATE   AVAILABLE   AGE
metrics-server   0/1     1            0           26s

2. Install Deployment and Service for Nginx

# k apply -f nginx_deploy.yaml 
deployment.apps/nginx-deployment created

# k delete apply -f nginx-service.yaml 
error: when paths, URLs, or stdin is provided as input, you may not specify resource arguments as well

3. Install HPA for Nginx

# k apply -f hpa.yaml 
horizontalpodautoscaler.autoscaling/nginx-deployment configured

4. Install Cronjob for scale up (set time according to your current timezone.)

# k apply -f cronjob.yaml 
cronjob.batch/nginx-deployment-scale-up configured

# k get cronjob
NAME                                SCHEDULE     SUSPEND   ACTIVE   LAST SCHEDULE   AGE
nginx-deployment-scale-up           51 3 * * *   False     1        34s             45s


# k get pods
NAME                                       READY   STATUS      RESTARTS   AGE
nginx-deployment-9456bbbf9-jprnx           1/1     Running     0          4s
nginx-deployment-9456bbbf9-qzb88           1/1     Running     0          40m
nginx-deployment-scale-up-27479751-zrv84   0/1     Completed   0          6s

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