https://github.com/wahengchang/nodejs-cron-job-must-know
it is an example of running node.js script with every certain period(cron job)
https://github.com/wahengchang/nodejs-cron-job-must-know
cron cron-jobs cronjob example javascript nodejs reactjs schedule scheduler tutorial
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it is an example of running node.js script with every certain period(cron job)
- Host: GitHub
- URL: https://github.com/wahengchang/nodejs-cron-job-must-know
- Owner: wahengchang
- Created: 2017-08-21T02:25:18.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2018-10-31T04:56:30.000Z (almost 7 years ago)
- Last Synced: 2025-03-22T01:38:16.711Z (7 months ago)
- Topics: cron, cron-jobs, cronjob, example, javascript, nodejs, reactjs, schedule, scheduler, tutorial
- Language: JavaScript
- Size: 6.84 KB
- Stars: 40
- Watchers: 5
- Forks: 15
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# nodejs-cron-job-must-know
it is an example of running Node.js script with every certain period(cron and non-cron job)
#### Why don't we use Linux `crontab`
- We can provide the full path to node `/usr/local/bin/node` in your cron job like:
- `30 6 1 * * /usr/local/bin/node /home/steve/example/script.js`
- Or making a script with the command, and then adding that to cron:
```
#!/usr/bin/env sh
node /home/campaigns/reporting/UNIT_TESTS/testCron.js > /home/campaigns/reporting/UNIT_TESTS/cron.log
```
- The problem with the two above methods is messing up the path. The command is in `absolute path`, but the Node.js script uses `relative path` to import/require other modules. It causes the error of file not found. __*So we need to execute the cron under the directory of Node.js script, which contains all the modules which will be used*__.
## Install
This lib is used to keep the cron-job alive, which triggers the node script at a certain time.
```
$ npm install --save node-cron
```
## Usage
Import node-cron and schedule a task:
[Read more](https://www.npmjs.com/package/node-cron)
```js
var cron = require('node-cron');
cron.schedule('* * * * *', function(){
console.log('running a task every minute');
});
```
## Run Node.js script in cron
- To run script : `$ node script1.js`
- And script: `$ npm run script -- PeterGood`
- `child_help.js` is an amazing Node.js script from [mout](https://github.com/mout/mout/), which helps to manage multiple linux commands.
Start a Daemon, and run
```
$ node cronNodeScript
```
Execute script every 1 min
```js
//execute every 1 min
cron.schedule('*/1 * * * *', function(){
....
});
```
Execute `$ node script1.js` and `npm run script -- PeterGood` every 1 min
```js
//execute every 1 min
cron.schedule('*/1 * * * *', function(){
var shell = require('./child_helper');
var commandList = [
"node script1.js",
"npm run script -- PeterGood"
]
shell.series(commandList , function(err){
// console.log('executed many commands in a row');
console.log('done')
});
});
```
## Reference:
- [https://www.npmjs.com/package/node-schedule](https://www.npmjs.com/package/node-schedule)
- [https://www.npmjs.com/package/node-cron](https://www.npmjs.com/package/node-cron)
- [https://stackoverflow.com/questions/7194102/node-js-script-not-executing-from-crontab](https://stackoverflow.com/questions/7194102/node-js-script-not-executing-from-crontab)
- [https://stackoverflow.com/questions/5849402/how-can-you-execute-a-node-js-script-via-a-cron-job](https://stackoverflow.com/questions/5849402/how-can-you-execute-a-node-js-script-via-a-cron-job)