How to create server instance in master in nodejs cluster? (both in worker and master)

Question

The following code snippet is throwing error. Is there a way to achieve the following functionality ? If not why it is not possible to create server instance in nodejs cluster master?

var cluster = require('cluster');
var http = require('http');

if (cluster.isMaster) {

  var numCPUs = require('os').cpus().length;
  for (var i = 0; i < numCPUs; i++) {
       cluster.fork();
  }

  // How to create server instance in master?
  // It is throwing error when I create server like below.
  http.Server(function(req, res) {
     res.writeHead(200);
     res.end("hello worlddddd\n");
  }).listen(8000);
} else {
  http.Server(function(req, res) {
      res.writeHead(200);
      res.end("hello world\n");
  }).listen(8000);

}

Answer 1

The error that I got when running this code seems to point to the address:port combination already being in use. Change the port that your master server is listening on, and that should resolve the error.