Go Load Balancer

This is a toy loadbalancer that I built to better understand how Loadbalancers and Service Discovery works.

Features

• RoundRobin Load Distribution
• Registration and Deregistration of backends through Service Discovery
• Cancellation propogation and timeouts(Configurable duration)
• Heartbeat and auto-deregistration during backend disconnection
• Supports all HTTP methods
• Handles requests concurrently from single and multiple clients

Usage

Start Loadbalancer

$ make run

To enable Service Discovery

1. Import client library

$ go get github.com/humanbeeng/go-lb/client

2. Initialise client and pass the loadbalancer's address(lbAddr) and the server's listenaddress(*addr)

conn, _ := net.Dial("tcp", lbAddr)
c := client.Client{Conn: conn, Addr: *addr}
c.Register()

TODO:

• URL pattern matched balancing
• Configurable strategy
• Hot reload config changes
• Export metrics about healthy servers
• CLI to add and remove backends and change strategy in realtime