ExpressJS Cluster test

app.js

  var cluster = require('cluster');
  
  if(cluster.isMaster) {
      var 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 {
    //one instance here
    // app.use(...
  }