Tag: cron

SimpleTrigger vs CronTrigger in Quartz Scheduler

SimpleTrigger
SimpleTrigger is used for scenarios in which we need to execute a job at a specific moment in time.

SimpleTrigger trigger = (SimpleTrigger) TriggerBuilder.newTrigger()
  .withIdentity("trigger1", "group1")
  .startAt(myStartTime)
  .forJob("job1", "group1")
  .build();

CronTrigger
The CronTrigger is used when we need schedules based on calendar-like statements.

CronTrigger trigger = TriggerBuilder.newTrigger()
  .withIdentity("trigger3", "group1")
  .withSchedule(CronScheduleBuilder.cronSchedule("0 0/2 8-17 * * ?"))
  .forJob("myJob", "group1")
  .build();

References
https://www.baeldung.com/quartz
https://stackoverflow.com/questions/26403391/difference-between-cron-trigger-and-simple-trigger-in-quartz-scheduler
http://www.quartz-scheduler.org/documentation/quartz-2.3.0/tutorials/crontrigger.html
https://www.freeformatter.com/cron-expression-generator-quartz.html

Scheduled backup MongoDB database using mongodump and cron

mkdir backup
touch monitoring.sh

#!/bin/bash
 
currentDate=`date +"%Y%m%d%H%M"`
dirName="monitoring_$currentDate"
filePath=/home/mahmood/backup/$dirName
mkdir $filePath
mongodump --db monitoring --out $filePath

sudo chmod +x monitoring.sh
sudo crontab -e
30 4 * * * /home/mahmood/backup/monitoring.sh

References
https://stackoverflow.com/questions/35574603/run-cron-job-everyday-at-specific-time
https://tecadmin.net/get-current-date-and-time-in-bash/
https://askubuntu.com/questions/350861/how-to-set-a-cron-job-to-run-a-shell-script
https://coderwall.com/p/hdmmnq/easy-automatic-nightly-backups-for-mongodb