NodeJS Load Balancer

A load balancer made using NodeJS, TypeScript and http module. The load balancer operates in the Application Layer according to OSI model.

Getting Started

Clone the Repository

You can clone this repository on your local machine using the following bash command.

git clone https://github.com/StrixROX/NodeJS-Load-Balancer.git

Build the Project

Before running the project, you will have to build the project. For this you will first have to install the development dependencies using:

npm install

Now, build the project using:

npm run build

The build output will get saved in /dist folder.

Start Initial Environment

src/index.ts file provides some starter code to initialise the environment for using the load balancer. You can run it using the start script in package.json as such:

npm start # servers run once

OR

npm run dev # servers restart each time you save any source files

On first run, your terminal output should look like this:

✔ [ OK ] Server created - localhost #1
✔ [ OK ] Server created - localhost #2
✔ [ OK ] Server created - localhost #3
✔ [ OK ] Load Balancer created - localhost #LoadBalancer
✔ [ OK ] Client Page Server created - localhost #ClientPageServer
🟢 [ localhost #1 ] Listening on port 3001...
🟢 [ localhost #2 ] Listening on port 3002...
🟢 [ localhost #3 ] Listening on port 3003...
🔷 [ localhost #LoadBalancer ] Listening on port 5000...
🟢 [ localhost #ClientPageServer ] Listening on port 8080...

There are 5 servers that get started by default - 3 backend servers, 1 load balancer server, 1 client page server. Each server has an idea associated, indicated by a # prefix.

You can directly go to http://localhost:8080 in your browser to open the client interface to start interacting with the app. (Don't expect too much in terms of design :P)

Running Tests

npm test src/*

Next Steps

• Create a web-socket based interface to monitor network health
• Add health-check functionality
• Increase network throughput
  • Create a variant which operates in the Transport Layer (OSI Layer 4)
  • Try using HTTP/2 via http2 module
• Implement an SSL layer using https module.