const cluster = require('express-cluster'); const app = require('./server.js'); const activePort = process.env.PORT || 3000; cluster((worker) => { app.listen(activePort, () => { console.log('worker ' + worker.id + ' is listening on port ' + activePort); }); }, { 'respawn': true, // workers will restart on failure 'verbose': true, // logs what happens to console });