Load-Balancer-with-health-check

A simple yet effective Python-based HTTP Load Balancer with live server health checks and a real-time web interface. Built using core Python modules and vanilla JavaScript, this project demonstrates the fundamentals of load balancing, server health monitoring, and frontend-backend integration.

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Features

• 🔁 Round-Robin Load Balancing: Evenly distributes incoming client requests across multiple backend servers.
• 🧠 Health Checks: Automatically detects down/unhealthy servers and skips them while routing requests.
• 🌐 Web Interface: Clean UI to send requests and visualize live status of all backend servers.
• 📊 Per-Server Visitor Count: Each server tracks and displays how many times it was visited.

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Project Structure

load-balancer-project/
├── backend/
│   ├── load_balancer.py        # Main load balancer logic
│   ├── round_robin.py          # Server cycling logic
│   ├── server1.py              # Example backend server 1
│   ├── server2.py              # Example backend server 2
│   └── server3.py              # Example backend server 3
├── frontend/
│   ├── index.html              # Web interface
│   ├── style.css               # Styling for UI
│   └── script.js               # JavaScript to interact with backend
├── requirements.txt            # Project dependencies
├── .gitignore                  # Git ignored files
└── README.md                   # Project documentation

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How to Run

1. Clone the Repository

git clone https://github.com/TanishqV5/Load-Balancer-with-health-check
cd LoadBalancer-Live

2. Install Dependencies

If required, install Python 3.11+ and run:

pip install -r requirements.txt

3. Run Backend Servers

python backend/server1.py
python backend/server2.py
python backend/server3.py

4. Start the Load Balancer

python backend/load_balancer.py

5. Open the Web Interface

Open frontend/index.html in your browser.

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Screenshots

Design

1. Project Overview
   
   A clean and simple web interface for the load balancer.

2. All Servers Healthy
   
   All backend servers are healthy and responding to requests.

3. One Server Down
   
   The load balancer detects one server as unhealthy and skips it while routing requests.

4. All Servers Down

   • Webpage
     The web interface displays an error when all servers are down.

   • Logs
     Logs showing the health check failures for all servers.

5. Server's responce and visitor count

   • Frontend
     The response from the backend server includes the visitor count.

   • Backend

6. Server Logs
   
   Logs from the load balancer showing health checks and request routing.

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Concepts Demonstrated

• Networking basics (HTTP, ports, routing)
• Load balancing strategy
• Backend server simulation
• JavaScript Fetch API
• Real-time UI update based on server state
• CORS configuration and handling

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Future Improvements

• Add dynamic backend server registration
• Display average response times per server
• Visual graphs for traffic load
• Dockerize for easier deployment
• Add user authentication for secured access

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License

This project is licensed under the MIT License. Feel free to use, modify, and distribute it as you like.

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