nginx-client-ip

docker-compose.yml

version: '3.8'

services:
  nginx:
    image: nginx:alpine
    container_name: nginx
    ports:
      - "8080:80"
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro
    depends_on:
      - backend

  backend:
    build:
      context: ./backend
    container_name: backend
    ports:
      - "3000:3000"

Dockerfile

FROM node:18-alpine
WORKDIR /app
COPY package.json .
RUN npm install
COPY . .
EXPOSE 3000
CMD ["npm", "start"]

nginx.conf

events {}

http {
    server {
        listen 80;
        location / {
            proxy_pass http://backend:3000;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }
    }
}

package.json

{
  "name": "backend",
  "version": "1.0.0",
  "main": "server.js",
  "dependencies": {
    "express": "^4.18.2"
  },
  "scripts": {
    "start": "node server.js"
  }
}

server.js

const express = require('express');
const app = express();

app.get('/', (req, res) => {
    const clientIp = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
    console.log(`Client IP: ${clientIp}`);
    res.send(`Your IP is: ${clientIp}`);
});

app.listen(3000, () => {
    console.log('Backend service is running on port 3000');
});