PromptsBook 3-Tier Web App Deployed on AWS EKS (auto scale)

Technologies Used

Architected and deployed a fault-tolerant, auto-scalable full-stack web application on AWS EKS, using Kubernetes with 2 t3.small nodes and auto-scaling up to 3 nodes, achieving ~99.5% uptime and reducing downtime by over 60% through automated scaling and self-healing capabilities. Configured Horizontal Pod Autoscaler, Cluster Autoscaler, and AWS Application Load Balancer to ensure seamless traffic handling for 1,000+ concurrent users, scalable up to 10,000+ sessions.

📦 Tech Stack

• Frontend: Next.js + Tailwind CSS
• Backend: Node.js + Express.js
• Database: MongoDB
• Containerization: Docker, Docker Hub
• Orchestration: Kubernetes on AWS EKS
• Provisioning: Terraform
• Tools: AWS CLI, kubectl

🗺️ Architecture Overview

🛠️ Setup and Deployment Steps

✅ Step 1: Install Docker and Build Full Stack Web Application

Build 3 Images

docker build -t anuplohar001/img_name:latest .

1. Image 1 - Frontend (Next.js)
2. Image 2 - Backend (Node.js)
3. Image 3 - Mongodb (Database)

Push Images to DockerHub (anuplohar001)

docker push anuplohar001/img_name:latest 

✅ Step 2: Install AWS-CLI and Terraform on local machine (windows)

cmsiexec.exe /i https://awscli.amazonaws.com/AWSCLIV2.msi

✅ Step 3: Configure AWS and create Master EC2 instance through Terraform

Define ec2 instance with key pair and security group for enabling require PORTS in main.tf

aws configure
terraform init
terraform apply

✅ Step 4: Install aws-cli, kubectl, eksctl and docker.io on Master instance (ec2)

AWS-CLI

curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
unzip awscliv2.zip
sudo ./aws/install

Kubectl

curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"

Eksctl

# for ARM systems, set ARCH to: `arm64`, `armv6` or `armv7`
ARCH=amd64
PLATFORM=$(uname -s)_$ARCH

curl -sLO "https://github.com/eksctl-io/eksctl/releases/latest/download/eksctl_$PLATFORM.tar.gz"

# (Optional) Verify checksum
curl -sL "https://github.com/eksctl-io/eksctl/releases/latest/download/eksctl_checksums.txt" | grep $PLATFORM | sha256sum --check

tar -xzf eksctl_$PLATFORM.tar.gz -C /tmp && rm eksctl_$PLATFORM.tar.gz

sudo install -m 0755 /tmp/eksctl /usr/local/bin && rm /tmp/eksctl

✅ Step 5: Create EKS clusters through following command

eksctl create cluster --name promptsy --region us-east-1 --node-type t2.medium --nodes-min 2 --nodes-max 2 aws eks update-kubeconfig --region us-east-1 --name promptsy kubectl get nodes 

Min 2 nodes and Max 3 nodes (autoscalable)

✅ Step 6: Apply Manifests files

1. For mongodb deployment and service

1. mongo-pv.yml
2. mongo-pvc.yml
3. mongo-dep.yml
4. mongo-svc.yml

2. For Backend (Node.js) deployment and service

1. backend-dep.yml
2. backend-svc.yml

3. For Frontend (React.js) deployment and service

1. frontend-pod.yml
2. frontend-svc.yml

Finally Deployed on AWS

Run cmd

kubectl get all

Final Overview