cluster.fork() - Start the server in a callback function

[subnetmarco]

I wrote the following piece of code, where I start an HTTP server in a child process only when a message is received by the master. The server is unreachable.

if (cluster.isMaster) {
    var child = cluster.fork();
    child.send({type:1, options:{port:8080, key:"12345"}});
} else {
    process.on("message", function (message) {
        if (message.type == 1) {
            http.Server(function(req, res) {
                doSomething(message.options.key);
            }).listen(message.options.port);
        }
    });
}

[bnoordhuis]

Works for me. Your example, adapted:

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

if (cluster.isMaster) {
  var child = cluster.fork();
  child.send({type:1, options:{port:8080, key:"12345"}});
} else {
  process.on("message", function (message) {
    if (message.type == 1) {
      http.Server(function(req, res) {
        res.writeHead(200, {'Content-Length':'3'});
        res.end("OK\n");
      }).listen(message.options.port);
    }
  });
}

$ curl -s http://127.0.0.1:8080/
OK
$

You probably need to make sure that your server is binding to the right address.