nohup node 1 &

之前我在小田那里得到了一个更好的方法，这也是Joyent官方所推荐的：

var cluster = require('cluster');
if (cluster.isMaster) {
  //Fork a worker to run the main program
  for (var i = 0; i < 2; i++) var worker = cluster.fork();
} else {
  //Run main program
  require('./app.js');
  console.log('worker is running');
}

cluster.on('death', function(worker) {
  //If the worker died, fork a new worker
  console.log('worker ' + worker.pid + ' died. restart...');
  cluster.fork();
});

这个是我的MoeStream的保护进程，我加了一些注释，以便大家使用。