Load Balancer Project

This repository contains a load balancer implementation in Go along with a basic backend server. The load balancer distributes incoming requests across multiple backend servers, ensuring efficient resource utilization and fault tolerance.

Folder Structure

repo/
 |- backend/
 |   |- backend.go
 |- load-balancer/
     |- load-balancer.go

File Descriptions

1. backend/backend.go:

   • A simple HTTP server that listens on a specified port.
   • It responds with a message indicating that the backend server is running.

2. load-balancer/load-balancer.go:

   • The core load balancer implementation.
   • Distributes requests among multiple backend servers using a round-robin algorithm.
   • Performs health checks to ensure backend servers are available.

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Features

• Round-Robin Load Balancing: Ensures an even distribution of requests across backend servers.
• Health Checks: Periodically verifies the availability of backend servers.
• Retries: Automatically retries requests if a backend server fails.
• Dynamic Configuration: Backends can be configured via command-line arguments.

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Setup and Usage

Prerequisites

• Go installed on your system (version 1.16+).

Steps to Run

1. Clone the repository:

   git clone https://github.com/rishichirchi/Load-Balancee
   cd repo

2. Build and run the backend servers:

   cd backend
   go build -o backend-server backend.go
   PORT=8081 ./backend-server &
   PORT=8082 ./backend-server &

3. Build and run the load balancer:

   cd ../load-balancer
   go build -o load-balancer load-balancer.go
   ./load-balancer -backends=http://localhost:8081,http://localhost:8082 -port=3030

4. Access the load balancer: Open your browser and navigate to http://localhost:3030. The requests will be distributed across the backend servers.

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Workflow Diagram

Below is a simplified workflow of the Load Balancer system:

graph TD
    A[Client Request] -->|HTTP Request| B[Load Balancer]
    B -->|Round-Robin| C[Backend 1]
    B -->|Round-Robin| D[Backend 2]
    C -->|Response| A
    D -->|Response| A
    B -->|Health Check| E[Monitor Backends]

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Configuration

Command-Line Flags

• -backends: Comma-separated list of backend server URLs (e.g., http://localhost:8081,http://localhost:8082).
• -port: Port for the load balancer to listen on (default: 3030).

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Example Logs

2024/12/21 12:00:00 Configured server: http://localhost:8081
2024/12/21 12:00:00 Configured server: http://localhost:8082
2024/12/21 12:00:01 Load balancer started at :3030
2024/12/21 12:01:00 Selected backend: http://localhost:8081
2024/12/21 12:01:05 Selected backend: http://localhost:8082
2024/12/21 12:02:00 Starting health check...
2024/12/21 12:02:00 http://localhost:8081 [up]
2024/12/21 12:02:00 http://localhost:8082 [up]
2024/12/21 12:02:00 Health check completed

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Future Improvements

• Add support for weighted load balancing.
• Implement SSL termination at the load balancer level.
• Enhance monitoring and alerting for backend server health.

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License

This project is licensed under the MIT License.

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Contributing

Feel free to open issues or submit pull requests for improvements or bug fixes.