Express application with Node Clustering

expressCluster1.js

'use strict';

/*
* Highly scalable Express server
* Purely for example purposes, until I start the blog properly!
*/

const cluster = require('cluster');

if (cluster.isMaster) {
  const numWorkers = require('os').cpus().length;

  console.log('Master cluster setting up ' + numWorkers + ' workers...');

  for (var i = 0; i < numWorkers; i++) {
    cluster.fork();
  }

  cluster.on('online', function(worker) {
    console.log('Worker ' + worker.process.pid + ' is online');
  });

  cluster.on('exit', function(worker, code, signal) {
    console.log(
      'Worker ' + worker.process.pid + ' died with code: ' + code + ', and signal: ' + signal
    );
    console.log('Starting a new worker');
    cluster.fork();
  });
} else {
  const app = require('express')();
  app.all('/*', function(req, res) {
    res.send('process ' + process.pid + ' says hello!');
  });

  const server = app.listen(8000, () => {
    console.log('Process ' + process.pid + ' is listening to all incoming requests');
  });
}