daemonizing wrapper for node apps

app.js

var express   = require('express')
  , app       = module.exports = express.createServer();

// you express app resides here ...

server.js

var daemon  = require('daemon')
  , app     = require('./app')
  , db      = require('mongoose');

// `QUIT` Signal handling
process.on('QUIT', function() {
  console.log("SIGQUIT received! exiting");
  // Close the db connection
  db.close(function(e) {
    if (e) console.log('ERROR closing the DB connection:\n', e);

    // Delete the pid file
    fs.unlink('./tmp/node.pid', function(e) {
      if (e) console.log(e);
      // Exit
      process.exit();
    });
  });
});


// I Expect a $PORT environment variable
app.listen( parseInt(process.env.PORT, 10) || 3001, function(err){
  if ( err ) {
    throw err;
  }
  // Daemonize the Application once started logging to our `./log/production.log` and `./log/production.error.log`
  daemon.daemonize({
    stdout: './log/' +process.env.ENV+ '.log'
  , stderr: './log/'+process.env.ENV +'.error.log'
  }
  , './tmp/node.pid'
  , function (err, pid) {
    if (err) {
      console.log('Error starting daemon: ');
      throw err;
    }
    console.log('Daemonized successfully with pid: ' + pid);
  });
});