在同一台服务器上运行多个 Node.js 应用程序

Question

I want to run multiple Node js apps on the same server, and so far I made some progress checking solutions for similar questions here (links below). Let's say I have 2 apps, each serving some html file, and I'd like to access each by visiting https://example.com/app1 and https://example.com/app2
So far, I have my main app, and my approach was to call this app which will then redirect a client to one of these 2 apps.
My main app looks like this:

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

app
  .use('/app1', require('./app1/index.js'))
  .use('/app2', require('./app2/index.js'))
  .listen(80);

Each of my two sub-apps (app1 and app2) looks like this

const express = require('express');
const bodyParser = require('body-parser');
const routes = require('./routes/api');
const mongoose = require('mongoose');
require('dotenv/config');

const app = express();

mongoose.connect(
    process.env.DB_CONNECTION,
    { useNewUrlParser: true, useUnifiedTopology: true }, () =>
    console.log('Connected to DB')
);
mongoose.Promise = global.Promise;

app.use(express.static('public'));
app.use(bodyParser.json());

app.use('/', routes); 

app.use(function (err, req, res, next) {
    res.status(422).send({ error: err.message })
});

The issue is that I don't get anything after deploying these apps and visiting eg https://example.com/app1
I'm super new in all this so there is likely a beginner's mistake in here. Can anyone help?

Related questions How to mount express.js sub-apps? and Running multiple Node (Express) apps on same port

Answer 1

If you want to run totally different application in node you might use proxy_pass / reverse proxy of apache/nginx. To do so each of your app should operate on theirs own ports and some other server (apache/nginx/etc) passing requests to each of them

• example for apache: https://www.digitalocean.com/community/tutorials/how-to-use-apache-as-a-reverse-proxy-with-mod_proxy-on-ubuntu-16-04 sadly with python examples as apps, but the principle is the same.
• example for nginx https://docs.nginx.com/nginx/admin-guide/web-server/reverse-proxy/

Im hosting several node apps using this technique and they are working really nice (nginx is much faster than apache). Also you might thinking about blocking access from internet to node apps ports directly.