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Script scheduleing

In This Section We will see how can we schedule our Data Base backup Script So we can get our backup after a fixed time

Getting Started

We will use corn job for running our script on fixed time

**To know more about it , Click Here

  • In most of the unix system corn job comes pre installed so to check that run the following script in your terminal
crontab -e

**if you any error after runing that you need to install it with following script then run the first command

   sudo apt install cron

** if you are running the command for the First time you will able to see something like this

photo_2024-01-30_06-29-02

Its Just asking you to choose any text editor , you can chose any one of them ( I would like to suggest you to chose nano editor for that just presss 1 and the enter)
  • After runing the first command a page will open in your screen , scroll down and and write this code
sytax: */5 * * * * /path to your/<env name>/bin/python3 BackupDatabase.py /<location for a log files>/<file name>.log 2>&1
example: */5 * * * * /root/Backupenv/bin/python3 BackupDatabase.py /root/mysqlbackupcode.log 2>&1
  • Now save The changes ( ctrl +s ) and exit (ctrl+x) and you will see the code wll send backup in each 5 mins ( it was just testing purpose)
  • If you get backup after few mintes then its working fine or if get an error the copy code form the path to BackupDatabase.py (ex: /root/Backupenv/bin/python3 BackupDatabase.py) and paste it in your VPS terminal and press enter will able to know the problem or you can check the log with the following command 
    syntax : cat /<location for a log files>/<file name>.log
example: cat /root/mysqlbackupcode.log
  • Now If Every Thing went well you didn't have any problem now its set correct time for backup
  • Open The crontab editor again and change the "*/5 * * * *" with "0 18 * * *"
  • Now is Should Look like this
sytax: 0 18 * * * /path to your/<env name>/bin/python3 BackupDatabase.py /<location for a log files>/<file name>.log 2>&1
example: 0 18 * * * /root/Backupenv/bin/python3 BackupDatabase.py /root/mysqlbackupcode.log 2>&1

Let understand What is written here in 3 parts

  • In first part '0 18 * * *' there i have written this. This part of code mean run the scipt at 18th hour of a day and run it every day

    ** If you want differnt time then you visit crontab website

  • In the second part we are running your script in my case the script name is 'backupdbSQLite.py' and it's in root directory

  • In the last and final part I have specified a path where the error log will save (if the script ever get error it you see it from the log file) , you can give any location as you want

  • After writing all of this just save the corn file and exit and you are all done

** now you will get daily backup in your telegram in a specified time **