cluster.js

const cluster = require('cluster');

function start() {
  
  if (cluster.isMaster) {
    console.log('CLUSTER MASTER:: Starting worker process...');
    
    cluster.fork();
    
    // listen for disconnects and restart accordingly
    cluster.on('disconnect', () => {
      console.log('CLUSTER MASTER:: A worker process has disconnected. Spawning a new one...');
      cluster.fork();
    });
    
  } else {
    // if this is not the master process, run the worker process
    require('server.js');
  }

}

start();