How can I handle errors in Node.js cluster module?

How can I handle errors in Node.js cluster module?

You can handle errors in the Node.js cluster module by listening to the 'exit' event on worker processes.

Can you give me an example of how to implement that?

Sure! You can use the following code snippet:

const cluster = require('cluster');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  cluster.on('exit', (worker, code, signal) => {
    console.log(`Worker ${worker.process.pid} died with code: ${code}, and signal: ${signal}`);
  });
} else {
  // Worker processes can share any TCP connection
  // In this case, it is an HTTP server
  require('./server');
}

What should I do if a worker crashes?

You can restart the worker by forking a new one in the 'exit' event handler. This ensures your application remains available.

Is there a way to log errors from the workers?

Yes, you can use a logging library like Winston or simply log to a file in the worker's error handling logic.