Get original client ip

General
,
1

How to get the original client IP inside the docker container to put into the database as a log, while I’m still trying with a simple code. I’m using nodejs express with module type configuration style.
this is my code:

import express from 'express'
import http from 'http'

const app = express()
app.set('port', '0.0.0.0' || '1234')
app.get('/', (req, res) => {
    const ipadd = req.socket.remoteAddress
    
    res.send({ status: true, message: `IP: ${ipadd}` })
    return
})

http.createServer(app).listen('1234', '0.0.0.0', () => {
    console.log(`Server running at http://0.0.0.0:1234/`)
})

i’ve try to run with command bellow

  1. docker run -d --restart unless-stopped --name read-ip-container --publish 1234:1234 read-ip:latest NOT WORKING TO GET CLIENT IP
  2. docker run --rm -it --net=host read-ip index.js -lkv 0.0.0.0 1234 NOT WORKING TO GET CLIENT IP

please help me solve this problem without request headers like x-forwarded-for :smiling_face_with_tear:

2

On Docker Desktop, the only way to retain the client ip is to enable host network in the Docker Desktop settings and starting the container attached to the host network.

see: https://docs.docker.com/engine/network/drivers/host/#docker-desktop

3

i’ve try this on number 2 but the result i get is 127.0.0.1

4

i try install docker on linux and i get original client IP. I run with command docker run -d --restart unless-stopped --name read-ip-container --publish 1234:1234 read-ip:latest i don’t know why it’s not working when host OS is windows but working on linux very well

5

Usually you would use the HTTP headers to get the original IP, especially when load balancers and reverse proxies are used on the way.

X-Forwarded-For: 1.2.3.4
X-Forwarded-Host: whoami.example.com
X-Forwarded-Port: 443
X-Forwarded-Proto: https
X-Forwarded-Server: 0415b78c68a2
X-Real-Ip: 1.2.3.4
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