├── README.md
├── docker-compose.yml
├── nginx.conf
└── webapi
    ├── .dockerignore
    ├── Dockerfile
    ├── package-lock.json
    ├── package.json
    └── server.js


/README.md:
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 1 | # Load Balancer Project with Nginx, Node.js, Docker, and Docker Compose
 2 | 
 3 | 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.
 4 | 
 5 | ## Getting Started
 6 | 
 7 | To get started with this project, you will need to have Docker and Docker Compose installed on your machine.
 8 | 
 9 | 1. Clone the repository
10 | 
11 | ```bash
12 | git clone https://github.com/ErickWendel/loadbalancer-nginx-docker-nodejs.git
13 | ```
14 | 
15 | 2. Navigate to the project directory
16 | 
17 | ```bash
18 | cd loadbalancer-nginx-docker-nodejs
19 | ```
20 | 
21 | 3. Start the application
22 | 
23 | ```bash
24 | docker-compose up -d
25 | ```
26 | 
27 | This will start the Node.js application and the Nginx load balancer. You can access the application by navigating to `http://localhost:3000`.
28 | 
29 | Inspired by [josephDev123](https://github.com/josephDev123/loadbalancer-nginx-docker-nodejs.git)
30 | 
31 | 
32 | 
33 | 


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/docker-compose.yml:
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 1 | version: '3.8'
 2 | 
 3 | x-webapi-common: &webapi-common
 4 |   build: ./webapi
 5 | 
 6 | services:
 7 |   nginx:
 8 |     image: nginx:latest
 9 |     ports:
10 |       - "3000:80"
11 |     depends_on:
12 |       - webapi1
13 |       - webapi2
14 |       - webapi3
15 |     volumes:
16 |       - ./nginx.conf:/etc/nginx/conf.d/default.conf:ro
17 | 
18 |   webapi1:
19 |     <<: *webapi-common
20 |     environment:
21 |       - SERVICE_NAME=webapi1
22 | 
23 |   webapi2:
24 |     <<: *webapi-common
25 |     environment:
26 |       - SERVICE_NAME=webapi2
27 | 
28 |   webapi3:
29 |     <<: *webapi-common
30 |     environment:
31 |       - SERVICE_NAME=webapi3
32 | 


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/nginx.conf:
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 1 | upstream loadBalancer {
 2 |    server webapi1:9000;
 3 |    server webapi2:9000;
 4 |    server webapi3:9000;
 5 | }
 6 | 
 7 | server {
 8 |    listen 80;
 9 |    location / {
10 |       proxy_pass http://loadBalancer;
11 |    }
12 | }
13 | 


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/webapi/.dockerignore:
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1 | ./node_modules
2 | 


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/webapi/Dockerfile:
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1 | from node:22-alpine
2 | 
3 | ADD . /app
4 | 
5 | WORKDIR /app
6 | 
7 | RUN npm ci --omit=dev
8 | 
9 | CMD npm start


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/webapi/package-lock.json:
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 1 | {
 2 |   "name": "backend",
 3 |   "version": "1.0.0",
 4 |   "lockfileVersion": 3,
 5 |   "requires": true,
 6 |   "packages": {
 7 |     "": {
 8 |       "name": "backend",
 9 |       "version": "1.0.0",
10 |       "license": "ISC",
11 |       "engines": {
12 |         "node": "v22.13.1"
13 |       }
14 |     }
15 |   }
16 | }
17 | 


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/webapi/package.json:
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 1 | {
 2 |   "name": "backend",
 3 |   "version": "1.0.0",
 4 |   "description": "",
 5 |   "type": "module",
 6 |   "main": "server.js",
 7 |   "scripts": {
 8 |     "dev": "node --watch server.js",
 9 |     "start": "node server.js",
10 |     "test": "echo \"Error: no test specified\" && exit 1"
11 |   },
12 |   "author": "erickwendel",
13 |   "license": "ISC",
14 |   "engines": {
15 |     "node": "v22.13.1"
16 |   }
17 | }


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/webapi/server.js:
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1 | import { createServer } from 'node:http'
2 | 
3 | const PORT = process.env.PORT || 9000;
4 | createServer((req, res) => {
5 |     res.end(`Hello from ${process.env.SERVICE_NAME}`)
6 | })
7 |     .listen(PORT, () => console.log(`Server running on port ${PORT}`))
8 | 


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