Introduction

You can check the article out.

Working Demo

Quickstart with Docker

This project has an already configured Docker Compose file launching four nodes.

You can build and run docker-compose as follows:

docker-compose up --build

You can kill some nodes with docker commands to test the cluster behavior.

If you want to add new nodes, please add its address to hardcoded variables.

// nodeAddressByID: It includes nodes currently in cluster
var nodeAddressByID = map[string]string{
	"node-01": "node-01:6001",
	"node-02": "node-02:6002",
	"node-03": "node-03:6003",
	"node-04": "node-04:6004",
}

In this repository, I wanted to avoid implementing a service discovery mechanism. I aim to learn and implement basic how to do leader election without service discovery.

You can also find my service discovery implementation and article

Quickstart without Docker

You can still execute this project without using Docker.

First, change the Node IPs. For example

// nodeAddressByID: It includes nodes currently in cluster
var nodeAddressByID = map[string]string{
	"node-01": "node-01:6001", <--- change here to localhost:6001
	"node-02": "node-02:6002", <--- change here to localhost:6002
	"node-03": "node-03:6003", <--- change here to localhost:6003
	"node-04": "node-04:6004", <--- change here to localhost:6004
}

Second, you can set which node you want to run in Program arguments like

go run . node-02

Additional ToDos

• 1- Implement with service discovery
• 2- Change ordered election to dynamic.