This is a simple load balancer built using Nginx, Node.js, Docker, and Docker Compose. The purpose of this load balancer is to distribute incoming traffic to multiple instances of a Node.js application.

To get started with this project, you will need to have Docker and Docker Compose installed on your machine.

1. Clone the repository

git clone https://github.com/josephDev123/loadbalancer-nginx-docker-nodejs.git

2. Navigate to the project directory

cd Nginx-nodejs-load-balancer

3. Start the application

docker-compose up -d

This will start the Node.js application and the Nginx load balancer. You can access the application by navigating to http://localhost:80.

The Nginx configuration is defined in the nginx/default.conf file. This file defines the upstream servers and the load balancing algorithm. In this sample project, we are using a round-robin algorithm to distribute requests among the upstream servers.

The Node.js application is a simple "Hello World" server that listens on port 9000. This port is exposed in the Dockerfile and mapped to port 90, 91, 92 in the docker-compose.yml file.

The docker-compose.yml file defines the Docker services for the project. It defines four services: backend1, backend2, backend3 and nginx.

The backends service uses the node:14.17.3-alpine3.14 Docker image and runs the Node.js application.

The nginx service uses the nginx:1.21.6 Docker image and runs the Nginx load balancer. It also mounts the nginx directory to the /etc/nginx directory in the container to provide the Nginx configuration files.

This sample project provides a basic setup for setting up a load balancer using Nginx, Node.js, Docker, and Docker Compose. You can use this as a starting point for your own load balancer projects.