lb-go

A simple Load Balancer implementation in Go, built from scratch to understand the core concepts behind load balancing and TCP proxying.

Current Features

• TCP Load Balancer
• Round Robin
• Weighted Round Robin
• Least Connections
• Multiple backend servers
• Concurrent client connections
• Bidirectional TCP forwarding
• Basic backend health state

Architecture

Client
   |
   v
Load Balancer :9090
   |
   +---- Backend 1 :8081
   |
   +---- Backend 2 :8082
   |
   +---- Backend 3 :8083

The load balancer accepts client connections, selects a backend using the configured strategy, and forwards traffic between the client and backend.

Load Balancing Strategies

Currently implemented:

• Round Robin
• Weighted Round Robin
• Least Connections

Planned:

• Consistent Hashing
• Health Checks / Backend Failure Detection
• Graceful Backend Recovery

Goal

This project is primarily a learning project to understand how load balancers work internally, including:

• Scheduling algorithms
• TCP connections and streams
• Concurrent connections
• Goroutines and synchronization
• Backend health
• Connection lifecycle
• Consistent hashing

Built from scratch in Go.