A NodeJS cluster communicating via ipc.

cluster-ipc.js

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

if (cluster.isMaster) {
  // init cluster
  require('os').cpus().forEach(() => {
    cluster.fork();
  });

  // add eventlisteners
  Object.values(cluster.workers).forEach(worker => {
    worker.on('message', message => {
      console.log(message);
    });
  });
} else {

  http.Server((req, res) => {
    res.send(200, 'hello world\n');

    process.send('Hi');
  }).listen(8000);
}