node-ipc/example/clusterUnixSocket/cluster-server.js

import ipc from '../../../node-ipc.js';
import fs  from 'fs';
import {cpus}  from 'os';
import cluster  from 'cluster';

const cpuCount=cpus().length;
const socketPath = '/tmp/ipc.sock';

ipc.config.unlink = false;

if (cluster.isMaster) {
   if (fs.existsSync(socketPath)) {
       fs.unlinkSync(socketPath);
   }

   for (let i = 0; i < cpuCount; i++) {
       cluster.fork();
   }
}else{
   ipc.serve(
     socketPath,
     function() {
       ipc.server.on(
         'currentDate',
         function(data,socket) {
           console.log(`pid ${process.pid} got: `, data);
         }
       );
     }
  );

  ipc.server.start();
  console.log(`pid ${process.pid} listening on ${socketPath}`);
}