Nginx proxy pass subdomain, node vhost

Question

I have some trouble with nginx proxy_pass redirection on localhost subdomain. I have a domain "domain.com", i want to redirect all request on *.domain.com on *.localhost:9000. Then node handle all request on *.localhost:9000 to the good express app.

On nginx conf when i try the following :

server {
    server_name extranet.domain.com;
    listen 80;
    location / {
       proxy_pass http://extranet.localhost:9000;
    }
}

Request on extranet.domain.com are well redirected to the good express webapp.

With this :

server {
    server_name ~^(.*?)\.domain\.com$;
    listen 80;
    location / {
       proxy_pass http://localhost:9000/$1;
    }
}

Express app running on localhost:9000 handle request /mysubdomainname, which implie that regex is good.

But when i try :

server {
    server_name ~^(.*?)\.domain\.com$;
    listen 80;
    location / {
       proxy_pass http://$1.localhost:9000;
    }
}

All request on *.domain.com return http code 502. Why http://localhost:9000/$1; works and not http://$1.localhost:9000; ? (all subdomain are set in /etc/hosts).

Thanks in advance. I'm totally lost !

VBart · Accepted Answer · 2016-08-19 11:15:58Z

2

When a host name isn't known at run-time, nginx has to use its own resolver. Unlike the resolver provided by OS, it doesn't use your /etc/hosts file.

answered Aug 19, 2016 at 11:15

VBart

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2 Comments

Daphoque Over a year ago

Thanks, So the only way to do what i want is to add server { server_name : subdomain1.domain.com; listen: 80; location / { proxy_pass subdomain1.localhost:9000; } } for each subdomain ?

VBart Over a year ago

Or configure your own local dns server.

juancho · Accepted Answer · 2018-04-19 11:57:11Z

2

Maybe this will give you a hint, I wanted to pass the subdomain from Nginx to an Express app. Here is my code:

nginx.conf

http {

upstream express {
  server localhost:3000;
}

domain.com inside nginx/sites-available

server {

listen 80;
server_name ~^(?<subdomain>.+)\.domain\.com$;

location / {
   proxy_set_header Subdomain $subdomain;
   proxy_set_header Host $host;
   proxy_pass http://express;
 }
}

Express app index.js

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

app.get('/', function (req, res) {
    const subdomain = req.headers.subdomain;
});

app.listen(3000, function () {
  console.log('Example app listening on port 4000!');
});

answered Apr 19, 2018 at 11:57

juancho

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