I have been trying to figure out how to use crontabs on my mac OS X I have a node script written that I would like to be able to execute in a scheduled manner. Here is the line I am using in my crontab file.
30 * * * * /usr/local/bin/node /Users/pmanca/Google Drive/JavaScript/code/Peter/marketing-tests/testBackup.js
It doesn't appear to be executing though. Can anyone see what I am doing wrong? Also is there another way on a mac or linux server to accomplish what I'm looking for? Also can you use the same line for a crontab job in linux as well(besides the file paths needing to change)?
You can use one of the two npm packages, cron or agenda
Both work on linux and OS X. Cron is best if your tasks are lightweight and you don't need your jobs to be persisted into db. Agenda uses mongodb for persistence.
You can configure a job in cron as:
var CronJob = require('cron').CronJob;
var job = new CronJob({
cronTime: '00 */30 * * * *',
onTick: function() {
/*
* Runs every 30 minutes, every hour, every day, all week
*/
},
start: false,
timeZone: 'America/Los_Angeles'
});
job.start();
To run in background on server you can run it with forever
Remember cron has an additional 6th place to the left for seconds. Otherwise the syntax is same.
By default cron process doesn't have the required permission to access the disk in macos. So, you should allow full access disk to cron process. For this one, add /usr/sbin/cron to your allowed full disk access process under Security & Privacy. Further information can be seen in How to Fix Cron Permission Issues in MacOS Catalina & Mojave
Related
can anyone help me figure out why my cron scheduling doesnt work?:
0 8 * * * /usr/bin/node /home/globein_ext/mysql-slack-bot/index.js
I'm trying to run a node app each day at 8am. I locate node first and then access the file I want run. Nothing seems to happen though.
Thanks for any and all help!
I have a job with Nodejs that I want to do it each 30 minutes to scan the Database and Update Products Data in An Ecommerce API with my Nodejs Program, note that the Nodejs Program is serving an REST API (Backend) for a react js web application
So I searched for that and I found that I can do that with Nodejs Cron Library like "node-schedule" but I know that will be more interesting to do it with Linux Cron
var j = schedule.scheduleJob('42 * * * *', function(){
console.log('The answer to life, the universe, and everything!');
});
Is there any library that can let me add Cron jobs to Linux using Nodejs Or would I do it with "fs" only? so I will open the cron job file and add my command?
The command crontab which is part of Vixie Cron allows you to create, edit and delete per-user cron entries.
Or if you are running as the root user, which you should not be doing, you can drop cron files into /etc/cron.d
This is not always supported, and if you're running in a Docker type container environment it is doubtful that you have any cron at all. In that environment you'd want your running Nodejs to handle scheduled jobs for you. Or use some other kind of distributed scheduled work system.
You can put your cron job to a nodejs script. Then adding to the crontab can be done with cronbee module, via API:
import { cronbee } from 'cronbee'
await cronbee.ensure({
taskName: 'do smth',
taskRun: `node my-script`,
cron: '42 * * * *'
})
or you can ensure the cron job via CLI, if the module is installed globally or from npm scripts:
$ cronbee ensure mytasks.json
I run one of my node.js command using the following command:
pm2 start sample.js --cron "0 1 * * *" -- SAMP
But the problem is this program run twice. First one is when I execute the command and send one is at 1:00 AM(Which we want).
So my query is how can set the cron so that this program runs at only once (At 1:00 AM only).
My suggestion to you is to use crontab for this task. This is exactly what cron was designed for, and not what pm2 was designed for.
As the comment above states, the --cron option only specifies when the app should be restarted, --cron cannot be used to schedule the running of an app. In the cases where we need to run a node app on a specific time table and don't need all of the fancy pm2 capabilities of auto-restarting and clustering, we simply use crontab.
So i have a debian web mapping server for my minecraft world. In order for the map to display the correct information two commands have to be run periodically. I have tried following a few guides to use crontab but so far have failed (and even had to restore the debian image -.-) I am new to linux as a whole and need a step by step guide in plain english to do the following.
run:
"overviewer.py --config /home/mc/test.cfg"
every 30 minutes on the hour and
"overviewer.py --config /home/mc/test.cfg --genpoi"
every five minutes on the hour
It seems pretty straight forward but I have literally spent the better part of two months doing this cause I keep screwing things up.
Thanks for any help!
Remember if you are using crontab, to use the full path to the python script. In debian you can type pwd in the terminal to show the path to your current location.
Assuming the python script is also located in /home/mc/ you should use the command:
/home/mc/overviewer.py --config /home/mc/test.cfg
I would suggest you look into crontab again, the ubuntu help page has alot of information. https://help.ubuntu.com/community/CronHowto
For every 30 minutes:
0,30 * * * * /home/mc/overviewer.py --config /home/mc/test.cfg
And for every 5 minutes:
*/5 * * * * /home/mc/overviewer.py --config /home/mc/test.cfg --genpoi
I'm trying to set up a node script to run as a cron job on Joyent. I can run arbitrary commands but node scripts to seem to execute. As an example:
# cron
# call a script every minute
# being specific about the location of node and the script to run
* * * * * /home/node/local/nodejs/bin/node /full/path/to/some-script.js
// node script at /full/path/to/some-script.js
var fs = require('fs');
fs.writeFile('/home/node/node-service/some-script.log', new Date.toString(), 'utf8');
What I expect to see after one minute is a file at /home/node/node-service/some-script.log with content like Mon Jan 21 2013 15:19:11 GMT-0600 but I see nothing. This is still the case even if the script is set to full read, write and execute permissions for all users and whether the crontab is set for the root or node users.
What am I missing?
Thanks
The fourth optional argument to writeFile is a callback to fire when the file system is done writing the file. You can use it to determine the error that is happening, as it's only argument is an error. Refer to the docs here.
It appears to be working now. I'm not sure what I changed that got it working. It may have been a permissions issue.