DEV Community

TechEazy Consulting
TechEazy Consulting

Posted on

Deploy a Spring Boot App on AWS EC2 with Load Balancer (Step-by-Step Guide)

#springboot #aws #tutorial #devops

🌍 Introduction

Deploying your application manually on AWS can be time-consuming and error-prone. You might face:

  • Traffic distributed unevenly across instances ❌
  • Manual setup of health checks and failover ❌
  • Lack of scalability and high availability ❌

👉 That’s where EC2 + ELB (Elastic Load Balancer) deployment shines.

By the end, you’ll understand how to deploy a Spring Boot app on multiple EC2 instances, set up an Application Load Balancer, and route traffic intelligently.

👉 Flow: Browser → ELB → EC2 Instances running Spring Boot

🔒 Step 1: Prepare Your Spring Boot App

Before we touch AWS, package your Spring Boot project into a runnable .jar file:

mvn clean package
Enter fullscreen mode Exit fullscreen mode

You’ll get something like app.jar in the target/ directory.

✅ We assume the app runs on port 8080
✅ Requires Java and Maven installed locally
✅ Target is .jar deployment, not Docker

  • We used the adaptive-ai-qms Spring Boot app as an example. But you can replace it with any web application and port according to app.

⚡ Step 2: Launch EC2 Instances

Let’s spin up two EC2 instances for our Spring Boot app:

  1. Go to AWS Console → EC2 → Launch Instance
  2. OS: Ubuntu Server 24.04 LTS (Free Tier eligible)
  3. Instance type: t2.micro
  4. Key Pair: Create/choose one (for SSH access)
  5. Configure Security Group:
  • SSH (22) → Your IP
  • HTTP (80) → Anywhere
  • Custom TCP (8080) → Anywhere (for Spring Boot)

🎯 Launch two EC2 instances with the same configuration.

📜 Step 3: Install Java & Deploy Spring Boot App

SSH into both instances:

ssh -i your-key.pem ubuntu@<EC2_PUBLIC_IP>
Enter fullscreen mode Exit fullscreen mode

Install Java:

sudo apt update
sudo apt install openjdk-21-jdk -y
Enter fullscreen mode Exit fullscreen mode

Upload your app using scp:

scp -i your-key.pem app.jar ubuntu@<EC2_PUBLIC_IP>:/home/ubuntu/
Enter fullscreen mode Exit fullscreen mode

Run the app in the background:

sudo nohup java -jar app.jar > app.log 2>&1 &
Enter fullscreen mode Exit fullscreen mode

Breakdown:

  • nohup: Keeps process running after logout
  • java -jar: Runs your Spring Boot app
  • > app.log 2>&1 &: Logs output and runs in background

✅ Now access your app via:

http://<EC2_PUBLIC_IP>:8080/api/adapt/welcome
Enter fullscreen mode Exit fullscreen mode

Repeat for the second EC2 instance.

🌐 Step 4: Create an Elastic Load Balancer (ALB)

Now we’ll route traffic to both EC2 instances via a Load Balancer.

  1. Go to EC2 → Load Balancers
  2. Click Create Load Balancer → Application Load Balancer
  3. Name: springboot-alb
  4. Scheme: Internet-facing
  5. VPC: Use default VPC
  6. Select AZs: Pick where your EC2s are running
  7. Security Group:
  • Create a new one: springboot-sg
  • Inbound Rules: Allow HTTP (80) and SSH (22)

Listener Setup

  • Protocol: HTTP
  • Port: 80

Create Target Group

  • Type: Instances
  • Name: springboot-tg
  • Protocol: HTTP
  • Port: 8080
  • Health check path: /actuator/health/readiness

✅ Register your two EC2 instances
✅ Attach this Target Group to the Load Balancer
✅ Click Create Load Balancer

Your ALB is now live and routing traffic.

🧪 Step 5: Test Your Setup

🎯 Go to Load Balancer → Description tab
📄 Copy the DNS name (e.g., springboot-alb-123456.ap-south-1.elb.amazonaws.com)

Visit:

http://<DNS_NAME>/api/adapt/welcome
Enter fullscreen mode Exit fullscreen mode

Expected Output:

Welcome to Adaptation Controller - Techeazy
Enter fullscreen mode Exit fullscreen mode

✅ Confirms ELB is routing to healthy EC2 instances
✅ Confirms Spring Boot app is working across both instances

🛠 You can now explore:

  • Manual deployment
  • Creating AMIs
  • Using Launch Templates with Auto Scaling

🎯 Conclusion

You’ve successfully:

✅ Deployed a Spring Boot app on EC2
✅ Set up a Load Balancer to route traffic
✅ Configured health checks to ensure uptime
✅ Created a production-ready architecture for web-scale apps

👉 Next, pair this setup with Auto Scaling Groups for true elasticity and high availability.

✅ Next Steps

🚀 Be interview-ready in the era of AI & Cloud — start your DevOps journey today!
💡 YouTube won’t get you a job. Real projects + real internship certificate will.
🔥 AI is reshaping jobs. Don’t watch it happen, be part of it with DevOps & Cloud skills.
⏳ Every month you wait, Cloud + AI jobs are being filled. Don’t miss out!
🌐 DevOps + AWS + AI = The skillset every recruiter is hunting for in 2025.

👉 Register now at TechEazy Consulting

Top comments (0)