Cluster Module in Node.js

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

if (cluster.isMaster) {
  const cpuCount = os.cpus().length
  
  console.log(\`Master \${process.pid} spawning \${cpuCount} workers\`)
  
  // Fork workers
  for (let i = 0; i < cpuCount; i++) {
    cluster.fork()
  }
  
  cluster.on('exit', (worker, code, signal) => {
    console.log(\`Worker \${worker.process.pid} died\`)
    console.log('Starting new worker...')
    cluster.fork()
  })
} else {
  // Workers share server port
  http.createServer((req, res) => {
    res.writeHead(200)
    res.end(\`Worker \${process.pid} responded\\n\`)
  }).listen(8000)
  
  console.log(\`Worker \${process.pid} started\`)
}