Cómo servir multiples sitios/apps (&subdomains) en el mismo puerto usando Expressjs, o cómo servir un "leviatán" app (todo acoplado para sentir la adrenalina en producción) sin Nginx.

A.serverWithoutKeystone.js

var path = require('path'),
    virtualhost = require('express-vhost'),
    express = require('express'),
    server = express();

var app1 = require('./app1/index').app;
/*
 ::app1/index.js (ejemplo)

var express = require('express');
var portalRoutes = require('./app1Routes');

var http = require('http');

var app1 = express();
app1.use(app1Routes);

exports.app = app1;
*/
var app2 = require('./app2/index').app;
    
// activar vhost expressJS, see: "Expressjs behind proxies" here -https://expressjs.com/en/guide/behind-proxies.html
server.use(virtualhost.vhost(server.enabled('trust proxy'))); 
// puerto escuha de nuestro server. 80 ? 
server.listen(3000);

virtualhost.register('www.asereje.com', app1);
virtualhost.register('www.learn.asereje.com', app2);

[etc...]

B.LeviatanWithKeystone.js

var path = require('path'),
    virtualhost = require('express-vhost'),
    express = require('express'),
    server = express();

var keystone = require('keystone');

var app2 = require('./app1/index').app;
/*
 ::app1/index.js (ejemplo)

var express = require('express');
var portalRoutes = require('./app1Routes');

var http = require('http');

var app1 = express();
app1.use(app1Routes);

exports.app = app1;
*/
    
// activar vhost expressJS, see: "Expressjs behind proxies" here -https://expressjs.com/en/guide/behind-proxies.html
server.use(virtualhost.vhost(server.enabled('trust proxy'))); 
// puerto escuha de nuestro server. 80 ? 
server.listen(3000);

//keystone maquinaria
keystone.init({
  //... [...]
});
keystone.import('models');
keystone.set([...]);
keystone.app.use([...]);
[etc...]

//Importante!! reemplazar keystone.run() por keystone.mount(). 
//documentación: https://github.com/keystonejs/keystone/wiki/Keystone-API
//keystone.run() 
keystone.mount();

//enjoy the leviatán.
virtualhost.register('www.asereje.com', keystone.app);
virtualhost.register('www.learn.asereje.com', app2);