Rece-LB

Building a HTTP load balancer and reverse proxy from scratch written in Go.

Features

• Random
• Round Robin
• Least Connection
• Passive health check at configurable intervals
• Active health check
• Config support using json

Running it

Start multiple instances of server.py

# create a virtual env (optional)
python3 -m venv venv
source venv/bin/activate

# install flask
pip install flask

# make multiple servers
./run.sh

Start the loadbalancer

go run main.go

Spam the loadbalancer with requests

for i in {1..20}; do curl -i 127.0.0.1:8080; done

To kill all the instances of the servers

./clear.sh

Config

port

The port to the run the load balancer on.

servers

A list of servers we want to forward requests to.

algorithm

Algorithm for load balancing. Can be Random, RoundRobin, or LeastConnection .

health_check_type

Defines the type of health check you want to perform on your server. Can be passive or active (active health check is by default).

health_check_interval

Time interval in seconds to perform health check on servers.

Sample Config

{
  "port": 8080,
  "servers": [
    "http://localhost:5001",
    "http://localhost:5002",
    "http://localhost:5003",
    "http://localhost:5004",
    "http://localhost:5005"
  ],
  "algorithm": "Random",
  "health_check_type": "passive",
  "health_check_interval": 5
}