I have Cronjob use node_module: node-cron
var hello = function( ) {
console.log('Hello world')
}
var job=new CronJob({cronTime:'00 52 13 * * *',
// that's important (100% made up example):
onTick: function() {
hello({
done: true,
lastRun: new Date()
});
},
start:false,timeZone:"America/Los_Angeles"});
job.start();
when I restart server .Cronjob not running.
node scripts that uses node-cron still have to be started for the cronjob to run. Adding things to node-cron, does not add it to cron on your machine, even though the naming can be confusing. node-cron simply allows your script to schedule jobs inside your script, while your script is running.
For this to work, either convert to scheduling the script on your machine, using the built in scheduler, or start your node script on machine startup. (This is different depending on your operating system).
Related
I have a simple node-cron schedule that calls a function:
cron.schedule('00 00 00 * * *', () => {
console.log('update movies', new Date().toISOString());
updateMovies();
});
When I log in to my server using PuTTy or use the droplet console in Digital Ocean and then run the updateMovies.mjs file node server/updateMovies.mjs and wait for the time that the cron-job should run, everything works as expected.
But when I close PuTTy or the droplet console in Digital Ocean, then nothing happens when the cron-job should run. So the server seems to lose the cron-job when I close the session.
Short answer
You need to run the app in the background
nohup node server/updateMovies.mjs >/dev/null 2>&1
Long answer
Run your app directly in the shell is just for demos or academic purposes. On an enterprise environment you should a live process like a server which runs independently of the shell user.
Foreground and background processes
Processes that require a user to start them or to interact with them are called foreground processes
Processes that are run independently of a user are referred to as background processes.
How run background process (Linux)
No body uses windows for an modern deployments, so in Linux the usual strategy is to use nohup
server.js
var express = require('express');
var app = express();
app.get('/', function(req, res) {
res.type('text/plain');
res.send('Hell , its about time!!');
});
app.listen(process.env.PORT || 8080);
nohup node server.js >/dev/null 2>&1
If you login to the server using some shell client, and run only node server.js it will start but if you close the shell window, the process will ends.
How run background process with nodejs and PM2
pm2 server.js
More details here:
https://pm2.keymetrics.io/docs/usage/quick-start/
Best way : Docker
You need to dockerize your app and it will run everywhere with this command:
docker run -d my_app_nodejs ....
i have created the cron job using node js ,which have to run in the interval of every hour even if the system is shut down. It has to run automatically with out manual invoke of the code .Please help to solve this
i have tried with pm2 but not working as expected.
First you should install npm package for crone-job
npm i node-cron
And then you can follow this code for your automatic job
const schedule = require("node-cron");
schedule.scheduleJob("00 02 * * *",
function () {
console.log("The answer to life, the universe, and everything!");
expected_Function_Name();
});
You will get your function output in every day 2pm.
I am trying to run a node script with cron every minute. I dont believe it is running at all. When I run grep cron /var/log/syslog I dont see it running in the log.
Did I write the cron job wrong? If so how do I run a node script in a cron job?
* * * * * node /home/ubuntu/Server/nodeScript.js
Cron jobs don't run in a shell so you have to give the full path to the node binary.
/usr/bin/node (or whatever it is on that machine)
Try which node to find out
The easiest way to run it every single minute is just to put your code in endless loop with timeout.
For example
function yourCode () {
for {
// your code
timeout(60 * 1000)
}
}
function timeout(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
Just be sure you run it with pm2 or supervisor so when it crashes it can restart automatically.
I have created a nodejs file using express enviornment and running the file on server using nodemon. Currently I have to give commands to the interface to run the particular file on nodemon but what I currently need is to schedule the task to run that file on server automatically at multiple occasion in a single day.
my file excute like this on terminal::
nodemon example_api.js
output terminal:
root#*********:/var/www/example project# nodemon example_api.js
[nodemon] ##.##.#####
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: *.*
[nodemon] starting `node api.js`
Listening on port 8080
Note: I am currently running node js on Mobaxterm terminal currently using windows but my file will be run on a server with linux interface
1. If you want to run your node process continuously and want to run only particular task:
Use node-schedule or node-cron packages to run your code block at desired time or interval.
i.node-schedule
var schedule = require('node-schedule');
var j = schedule.scheduleJob('*/30 * * * * ', function(){
console.log('The answer to life, the universe, and everything!');
});
ii.node-cron
var cron = require('node-cron');
cron.schedule('*/30 * * * *', function(){
console.log('The answer to life, the universe, and everything!');
});
2. If you want to run only single node script:
You can use Linux crontab to execute your script at desired time
crontab -e
and add following entry
*/30 * * * * /usr/local/bin/node /home/ridham/example/script.js
This will execute /home/ridham/example/script.js every 30 minutes. and always give full qualified path here.
You have to give crontime in any of the following. you can learn about crontime here
For a simple implementation - you can just use setInterval like so:
setInterval(() => {
// do something every 5 seconds
}, 5000);
But it you want something like a cron, then, you might wanna go with node-cron or node-schedule.
You can also use providers like AWS CloudWatch. AWS CloudWatch allows you to run AWS Lambda functions on a cron.
I m using package for task sechdule in my nodejs/parseserver open source
https://www.npmjs.com/package/node-cron
but even i comment the job and restarted servert ...job seems running.....can some one guide me here??
var counter=0;
Parse.Cloud.define("test", function(request, response) {
response.success(counter+1);
});
//var cron = require('node-cron');
//var task=cron.schedule('*/1 * * * *', function(){
/* Parse.Cloud.run('test',{}, {
success: function(results) {
console.log('test');
response.success(results);
},
error: function(error) {
response.error("Some error.");
}
}); */
//console.log('job creared loop');
//});
It sounds like the file where the cronjob is, is not loading with the changes. But some information is missing from your question I think.
Which server are you referring to & what server:
1. Are you just running the node fafa.js program again?
2. Are you working with Forever or PM2? If PM2 you need to
sudo pm2 restart [name of file]
Are you completely restarting the whole server??? (AWS etc)
Perhaps a simple
console.log("see if cron job runs")
within the code will show you what is going on. Obviously if the console.log does not appear the old code is still running.
I think if the above is not the case we would need more information.