A developer shared a step-by-step guide to deploying a highly available web application on AWS using Application Load Balancer and Auto Scaling Groups. The setup includes a custom VPC, public/private subnets, and NAT Gateway for secure outbound traffic.

This beginner-friendly architecture isolates EC2 instances in private subnets, exposing only the ALB to the internet. Core services like Target Groups, Security Groups, and Elastic IP are configured following production best practices for secure networking and automatic scaling.

The implementation uses Ubuntu-based EC2 instances with Apache, launched via a template that includes a user data script. The configuration supports dynamic scaling from 1 to 3 instances, with health checks managed through the ALB. Readers can replicate the project using the provided GitHub repository.

This design mirrors real-world enterprise deployments and is ideal for cloud engineering portfolios. Future enhancements include adding HTTPS with ACM, integrating Route 53, and monitoring with CloudWatch.