Testing Cluster Autoscaler

Check Cluster Autoscaler

we were able to deploy Cluster Autoscaler successfully.

The following steps will help test and validate the Cluster Autoscaler functionality in your cluster.

Deploy a sample application as a deployment. Scale deployment to 50. Scaling event monitoring.

1. Deploy sample application

   • Check the number of available nodes.

kubectl get nodes

2. Make sample nginx application Create a directory and a file named nginx.yaml:

mkdir -p /home/ec2-user/environment
sudo vi /home/ec2-user/environment/nginx.yaml

Copy the following content into the nginx.yaml file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-to-scaleout
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        service: nginx
        app: nginx
    spec:
      containers:
      - image: nginx
        name: nginx-to-scaleout
        resources:
          limits:
            cpu: 500m
            memory: 512Mi
          requests:
            cpu: 500m
            memory: 512Mi

Finally, apply the nginx.yaml file:

kubectl apply -f ~/environment/nginx.yaml

3. Check the pod is running

kubectl get pod -l app=nginx

4. Implement Scale deployment replicas

• We can now scale the deployment to 10 replicas and observe the deployment:

kubectl scale --replicas=10 deployment/nginx-to-scaleout

5. Next we do Monitoring the scaling event

• Some pods will be in a Pending state, which will trigger the cluster-autoscaler to expand the EC2 pool:

kubectl get pods -l app=nginx -o wide --watch

6. To view the cluster-autoscaler log

kubectl -n kube-system logs -f deployment/blueprints-addon-cluster-autoscaler-aws-cluster-autoscaler

7. You can list all the nodes

kubectl get nodes

8. To delete the execution resource

kubectl delete deploy nginx-to-scaleout
rm ~/environment/nginx.yaml