🛠️ Pro Interview Tips (AWS EKS)

• Understand IAM roles and how to securely manage permissions.

• Be ready to explain how you handle scalability and high availability in EKS.

• Know the full lifecycle: from provisioning clusters to CI/CD deployment.

• Discuss monitoring tools like Prometheus, CloudWatch, or Grafana integration.

• Be able to troubleshoot pod, node, and networking issues in real-world scenarios.

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🚀 Three-tier Application Deployment on AWS EKS

A structured deployment guide for a complete full-stack app using AWS EKS.

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📦 Code & Resources

• GitHub Repository: ThreeTierAppChallenge

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👤 IAM Setup

1. Create an IAM user:

   • Username: eks-admin

   • Permissions: AdministratorAccess

2. Generate Access Key ID and Secret Access Key.

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🖥️ EC2 Setup

• Launch an Ubuntu EC2 instance in us-west-2.

• SSH into your instance.

ssh -i your-key.pem ubuntu@<public-ip>

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📥 Install Tools on EC2

AWS CLI v2

curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
sudo apt install unzip
unzip awscliv2.zip
sudo ./aws/install -i /usr/local/aws-cli -b /usr/local/bin --update
aws configure

Docker

sudo apt-get update
sudo apt install docker.io
docker ps
sudo chown $USER /var/run/docker.sock

kubectl

curl -o kubectl https://amazon-eks.s3.us-west-2.amazonaws.com/1.19.6/2021-01-05/bin/linux/amd64/kubectl
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin
kubectl version --short --client

eksctl

curl --silent --location "https://github.com/weaveworks/eksctl/releases/latest/download/eksctl_$(uname -s)_amd64.tar.gz" | tar xz -C /tmp
sudo mv /tmp/eksctl /usr/local/bin
eksctl version

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🧰 Create EKS Cluster

eksctl create cluster --name three-tier-cluster --region us-west-2 --node-type t2.medium --nodes-min 2 --nodes-max 2
aws eks update-kubeconfig --region us-west-2 --name three-tier-cluster
kubectl get nodes

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📄 Deploy Application

kubectl create namespace two-tier-ns
kubectl apply -f .
# To delete:
kubectl delete -f .

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🧹 Delete EKS Cluster

eksctl delete cluster --name my-cluster --region us-west-2

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📦 AWS Load Balancer Controller

Create IAM Policy

curl -O https://raw.githubusercontent.com/kubernetes-sigs/aws-load-balancer-controller/v2.5.4/docs/install/iam_policy.json
aws iam create-policy --policy-name AWSLoadBalancerControllerIAMPolicy --policy-document file://iam_policy.json

Associate OIDC and Create Service Account

eksctl utils associate-iam-oidc-provider --region=us-west-2 --cluster=my-cluster --approve

eksctl create iamserviceaccount \
--cluster=my-cluster \
--namespace=kube-system \
--name=aws-load-balancer-controller \
--role-name AmazonEKSLoadBalancerControllerRole \
--attach-policy-arn=arn:aws:iam::626072240565:policy/AWSLoadBalancerControllerIAMPolicy \
--approve \
--region=us-west-2

Install Helm and Controller

sudo snap install helm --classic
helm repo add eks https://aws.github.io/eks-charts
helm repo update eks

helm install aws-load-balancer-controller eks/aws-load-balancer-controller \
  -n kube-system \
  --set clusterName=my-cluster \
  --set serviceAccount.create=false \
  --set serviceAccount.name=aws-load-balancer-controller

kubectl get deployment -n kube-system aws-load-balancer-controller
kubectl apply -f full_stack_lb.yaml

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🔍 Comparison Table – Key Tools

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Here is a quick recap table of the Top 15 AWS EKS Interview Questions, complete with brief answers, pros, and cons — perfect for review

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✅ EKS Interview Questions – Table Format

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