Test Task: Web App Deployment in Kubernetes

This is a solution for deploying a web application in a Kubernetes cluster.

Includes

• allin.yaml — full manifest with comments
• Helm chart with the same manifests
• Terraform — creates an AWS EKS cluster and installs the app using Helm chart

What you get

Nginx as a sample web app with:

• pods distribution across zones
• handling slow startup (5-10 sec)
• scales based on daily load pattern
• low CPU during steady state, with ability to get more if needed
• balance berween resilience and resource consumption

The K8s cluster with:

• 5 nodes, evenly-distributed in 3 zones
• Ingress/Nginx controller

How to check

Check your browser while port-forwarding: Check scaling:

To get nodes with zones:

kubectl get nodes -L topology.kubernetes.io/zone

To get the pods:

kubectl get pods

To see the connection between pods and service:

kubectl describe ingress

Use the value from "Address" field instead of EXTERNAL-IP to get the Nginx web app welcome page:

curl -v EXTERNAL-IP -H "Host:my-app.example.com"

or run:

kubectl port-forward svc/my-web-app-service 8080:80

and check the http://localhost:8080 in your browser to see the Nginx web app welcome page.

To check scaling up:

kubectl create job --from=cronjob/scale-up-my-web-app manual-scale-up
kubectl get pods -o wide -w

To check scaling down:

kubectl create job --from=cronjob/scale-down-my-web-app manual-scale-down
kubectl get pods -o wide -w

How to Deploy

Option 1: You already have a Kubernetes cluster

Deploy using plain YAML

kubectl apply -f allin.yaml

or

Deploy using Helm chart

helm install web-app-release ./mychart

Option 2: No cluster? Deploy everything with Terraform (AWS EKS)

Requires: AWS CLI, Terraform, kubectl, Helm.

Add the secrets.auto.tfvars file with secrets for connecting AWS:

access_key = "your_access_key"
secret_key = "your_secret_key"

Run:

terarform init
terraform apply

Use the kubeconfig_command from the output to connect to the cluster.

How to Uninstall

If you used plain YAML

kubectl delete -f allin.yaml

If you used Helm chart

helm uninstall web-app-release

If you used Terraform

terraform destroy