Overview

In this task, we 're going to deploy the Infra of GKE with a custom VPC using Terrafom. Also, we enabled the autoscaling on the level of worker nodes and the HPA for the pods.

After the Infra is up and running, we 're going to deploy a simple angular application using helm and expose this app to use HTTPS using ingress.

Provision the infra

• We 're going to create a GKE cluster with 1 node and enable the autoscaling feature in the us-central1-a zone

  cd terrafrom-gke
  terrafrom init
  terrafrom apply
  

Create a tls cert of the application

• Copy the certificate and the private key under the cert folder cd cert kubectl create secret tls devops-task --cert cert --key key

Deploy the ingress controller to be able to use the ingress

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.48.1/deploy/static/provider/cloud/deploy.yaml

Deploy the application using helm

• We already enabled the ingress and the hpa in the values.yml

  helm install test helm
  

Test the autoscaling "HPA" of the application, by generating some load

kubectl run -i --tty load-generator --rm --image=busybox --restart=Never -- /bin/sh -c "while sleep 0.01;001 do wget -q -O- http:////test-helm; done"

• open a new terminal and check the number of replicas, the max is 5

  kubectl get pods  
  

Test the autoscaling of the nodes using stress tool, the max is 3

kubectl run stress --image=nginx
kubectl exec -it stress -- /bin/sh
apt update ; apt install stress -y
stress --cpu 6 --io 3 --vm 5 --vm-bytes 10240M --timeout 200s

• After 2-3 minutes, run kubectl get nodes to see the new nodes