How to run Cron Job in Node.js application that uses cluster module?

Question

I\'m using node-cron module for scheduling tasks in Node.js application. I also want run the application in several processes using core cluster module.

Running applica

Answer 1

I also have a problem with cluster module and finally i found sample way to solve problem.

Let master cluster execute cronJob.

My project use Kue to manage jobs. When cronJob run i get a list of jobs.

index.js

global.cluster = require('cluster');

if (cluster.isMaster) {
  const cpuCount = require('os').cpus().length;
  for (let i = 0; i < cpuCount; i += 1) {
    cluster.fork();
  }
} else {
  // start your express server here
  require('./server')
}

cluster.on('exit', worker => {
  logger.warn('Worker %d died :(', worker.id);
  cluster.fork();
});

cron.js

const cron = require('cron').CronJob;

const job = new cron('* * * * *', async () => {
  if (cluster.isMaster) {
    console.log('cron trigger');
  }
});

job.start();

Hope this help.