App with setup and clusters

app.js

var app, cluster, cpu, cpus, express, http, path, setup;

cluster = require('cluster');

if (cluster.isMaster) {

  if (process.env.NODE_ENV === 'setup') {
    console.log('Starting setup process.');

    express = require('express');
    setup = require('./routes/setup');
    app = express();

    app.configure('setup', function() {
      setup(function(resp) {
        console.log(resp);
        process.kill(process.pid, "SIGTERM");
      });
    });
    
  } else {
    cpus = require('os').cpus().length;

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

    cluster.on('exit', function(worker) {
      console.log("Worker " + worker.id + " died :(");
      cluster.fork();
    });

  }
}else if (process.env.NODE_ENV !== 'setup') {

  // Stuff your app does here
  
}else {
  console.log("Uhh. This should never happen. See app.js.");
}