☁️ Creating a Highly Available Environment – AWS Academy Cloud Architecting

This project demonstrates the design and deployment of a highly available (HA) web application architecture on Amazon Web Services (AWS).
It is part of the AWS Academy Cloud Architecting Capstone series and showcases the implementation of cloud reliability, scalability, and fault tolerance principles.

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🧭 Overview

The goal of this project is to transform a single-instance application into a multi-AZ, fault-tolerant infrastructure using AWS managed services.

The final architecture eliminates single points of failure and ensures continuous availability of resources, even if one Availability Zone (AZ) or component fails.

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⚙️ Architecture Components

AWS Service	Description	Role in High Availability
Amazon VPC	Isolated virtual network with public and private subnets.	Enables multi-AZ deployment and secure traffic routing.
EC2 Instances	Hosts the web application.	Deployed across multiple AZs for redundancy.
Elastic Load Balancer (ALB)	Distributes incoming traffic across healthy instances.	Ensures seamless failover and load balancing.
Auto Scaling Group (ASG)	Automatically adjusts instance capacity.	Maintains system reliability and performance.
Amazon RDS	Managed relational database.	Configured for Multi-AZ replication to prevent data loss.
NAT Gateway	Enables outbound internet access for private instances.	Supports AZ redundancy when deployed in pairs.
Security Groups	Act as virtual firewalls for traffic control.	Enforces least privilege and tier isolation.
CloudWatch	Monitors system metrics and health.	Automates recovery actions via alarms.

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🧩 Final Architecture

• Multi-AZ VPC with public and private subnets
• Elastic Load Balancer distributing traffic across AZs
• Auto Scaling Group maintaining minimum capacity of two instances
• RDS Multi-AZ database deployment
• NAT Gateways for outbound traffic redundancy
• CloudWatch monitoring and alarms for health checks

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🧰 Tools and Technologies

• AWS EC2
• AWS Elastic Load Balancer (ALB)
• AWS Auto Scaling
• AWS RDS (MySQL)
• AWS CloudWatch
• AWS VPC
• AWS IAM

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🧱 Architecture Diagram (Conceptual)

                  ┌────────────────────────────┐
                  │   Elastic Load Balancer    │
                  └────────────┬───────────────┘
                               │
             ┌─────────────────┴──────────────────┐
             │                                    │
      ┌──────────────┐                    ┌──────────────┐
      │ EC2 Instance │                    │ EC2 Instance │
      │ (AZ-1)       │                    │ (AZ-2)       │
      └──────┬───────┘                    └──────┬───────┘
             │                                    │
             └────────────┬────────────┬──────────┘
                          │            │
                  ┌───────▼──────┐ ┌───▼──────────┐
                  │   RDS (AZ-1) │ │ RDS (Standby)│
                  └──────────────┘ └───────────────┘