Node.js集群未监听

Question

I am trying to build a "Hello World" multi-process node.js HTTP server.

Using the code samples provided in the node docs here I can't get the "listening" event to fire, and thus an HTTP server to respond to requests. I am, however, getting the "online" event to fire.

How can I get this server to respond to requests?

I'm running on OSX 10.8.4, node v0.10.7.

Here's what I have:

var cluster = require('cluster');
var http = require('http');
var numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  // Fork workers.
  for (var i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  cluster.on('online', function(worker) {
    console.log('A worker with #' + worker.id);
  });
  cluster.on('listening', function(worker, address) {
    console.log('A worker is now connected to ' + address.address + ':' + address.port);
  });
  cluster.on('exit', function(worker, code, signal) {
    console.log('worker ' + worker.process.pid + ' died');
  });
} else {
  // Workers can share any TCP connection
  // In this case its a HTTP server
  http.createServer(function(req, res) {
    res.writeHead(200);
    res.end('hello world\n');
  }).listen(8000);
}

Answer 1

I fixed the issue by running the file directly. Previously, I ran server.js which was a one liner:

server.js

require("./server/app.js");

server/app.js (code snippet in the question)

By running node app.js instead of node server.js the cluster started listening. Not sure why this made a difference.