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Secure and Scalable Three-Tier AWS Architecture

DevOps & Solution Architecture

  • AWS CodePipeline
  • AWS CloudTrail
  • AWS CloudFormation
  • Microservice
  • Php

Overview

Optimized Three-Tier AWS Architecture for Security and Performance

A client needed a secure, reliable, and scalable cloud infrastructure to host a web application and its database on Amazon Web Services (AWS). Vital Steer designed a three-tier architecture using a VPC with public and private subnets, ensuring database security while maintaining application accessibility. The project delivered a high-performing, maintainable, and scalable cloud environment, enabling faster deployment and efficient operations.

Client

The client required a highly available and secure infrastructure capable of supporting a modern web application. Key requirements included:

  • Security: Database must remain inaccessible from the internet.
  • Scalability: Support for future growth.
  • Manageability: Easy-to-maintain infrastructure with documentation.
  • Performance: Low-latency communication between application and database.

 

 Solution: Three-Tier AWS Architecture

Vital Steer implemented a classic three-tier architecture within a dedicated AWS VPC, following network segmentation and the principle of least privilege.

  1. Network Segmentation (VPC & Subnets)
  • AWS VPC: Isolated network for the application.
  • Public Subnet: Hosts internet-facing resources.
    • EC2 Instance (“Mojo Test”): Apache Application Server on Ubuntu 16.04 LTS with a Public IP (web tier).
  • Private Subnets: Hosts backend resources.
    • EC2 Instance (“mongo4.4.7-db-server”): MongoDB Database on Amazon Linux 2 with Private IP (data tier).
    • Bastion Host: Secure point for admin access to private instances.
  1. Application and Data Flow
  • User Access: End-users reach the app via Route53 DNS pointing to the App Server Public IP.
  • Database Connectivity: Application connects to the database via Private IP, keeping traffic internal and secure.
  • S3 Integration: VPC Endpoint allows secure communication with S3 buckets without using public internet.
  1. Developer Access
  • External Developers: Access public EC2 instance via Public IP.
  • Internal Admins/Developers: Connect securely through the Bastion Host to manage private resources. 

Outcomes

The implementation delivered measurable results:

  • 100% Data Isolation: Database fully secured in a private subnet.
  •  Enhanced Security: Bastion host centralized admin access, reducing attack surface.
  •  Optimized Performance: Low-latency internal connections improved responsiveness.
  •  Streamlined Operations: Well-documented architecture simplified maintenance and updates.
  •  Faster Deployment: Seamless delivery enabled quicker application launch.

Conclusion

Vital Steer leveraged AWS services (VPC, EC2, Route53, S3, VPC Endpoints) to deploy a secure, scalable, and maintainable three-tier architecture. The project’s success was driven by technical excellence, rapid responsiveness, and detailed documentation, ensuring the client’s long-term operational efficiency and satisfaction.

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