由于cluster.fork是在child_process.fork之上实现的，因此您可以使用来将消息从主服务器发送到工作服务器，而可以通过将消息从worker.send({ msg: 'test' })工作服务器发送到主服务器process.send({ msg: 'test' });。您会收到以下消息：（worker.on('message', callback)从工作人员到主服务器）和process.on('message', callback);（从主服务器到工作器）。

这是我的完整示例，您可以通过浏览http：// localhost：8000
/进行测试，然后工作人员将消息发送给主服务器，主服务器将回复：

var cluster = require('cluster');
var http = require('http');
var numReqs = 0;
var worker;

if (cluster.isMaster) {
  // Fork workers.
  for (var i = 0; i < 2; i++) {
    worker = cluster.fork();

    worker.on('message', function(msg) {
      // we only want to intercept messages that have a chat property
      if (msg.chat) {
        console.log('Worker to master: ', msg.chat);
        worker.send({ chat: 'Ok worker, Master got the message! Over and out!' });
      }
    });

  }
} else {
  process.on('message', function(msg) {
    // we only want to intercept messages that have a chat property
    if (msg.chat) {
      console.log('Master to worker: ', msg.chat);
    }
  });
  // Worker processes have a http server.
  http.Server(function(req, res) {
    res.writeHead(200);
    res.end("hello world\n");
    // Send message to master process
    process.send({ chat: 'Hey master, I got a new request!' });
  }).listen(8000);
}