ShareDigest blog » cron http://blog.sharedigest.com Trading, software, web and random stuff Tue, 06 Jul 2010 11:30:16 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 Cron Task For Automated Backups http://blog.sharedigest.com/cron-task-for-automated-backups/ http://blog.sharedigest.com/cron-task-for-automated-backups/#comments Sun, 18 Oct 2009 20:56:46 +0000 SD http://blog.sharedigest.com/?p=111 What we’re going to cover in this tutorial, is how to set up a cron job on a Centos 5 linux server. The basic problem I had, was that our server’s /backup/cpbackup/ folder was getting filled with (automated) backups very fast, taking up tonnes of disk space very quickly (only 7.5GB total available on this VPS! – perhaps time to look for a better one?). We’ll learn how to use cron jobs here to achieve the following:

  • Execute a script at a specified time once a week, which peforms the following:
  • Create a zipped-tar backup of the folder /backup/cpbackup/ at /backup/cpbackup_ddmmyy.tar.gz
  • Clear the entire /backup/cpbackup/ folder of all contents, freeing up this space
  • Email the administrator that the new backup_x.tar.gz file has been created
  • (Optionally): Automatically copy this file over to another (larger capacity) server

Step 1: Install A Cron Task

A great little tutorial showing exactly how easy it is to install a cron task on any linux system, can be found here.

Step 2: Create the Shell Script

The script which performs the magic, looks like this:

#!/bin/sh
# Create a zipped-tar backup of the folder /backup/cpbackup/ at /backup/cpbackup_ddmmyy.tar.gz
# Clear the entire /backup/cpbackup/ folder of all contents, freeing up this space
# Email the administrator that the new backup_x.tar.gz file has been created
# (Optionally): Automatically copy this file over to another (larger capacity) server
 
EMAIL="youremail@gmail.com"
NOW=$(date +"%d-%b-%y_%H%M")
BFILE="/backup/wz_cbackup_$NOW.tar.gz"
MSG=""
SUBJECT=""
 
#create tar zip file:
tar -czf $BFILE /backup/cpbackup/
 
if [ "$?" -ne "0" ]; then
	MSG="tar -czf $BFILE /backup/cpbackup/ failed."
	SUBJECT="weeklyZip: $BFILE creation failed!"
else
  	MSG="$BFILE successfully created. Please either download or copy to new server."
  	SUBJECT="weeklyZip: $BFILE  successfully created."
 
	#Success, so we clear out the /backup/cpbackup/ folder:
	rm -R /backup/cpbackup/* -f
fi
 
/bin/mail -s "$SUBJECT" "$EMAIL" <<< "$MSG"

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