Benutzer:Lyl

Jabber: lyl@jabber.ccc.de

Scripting

Backup

Inbetriebnahme des Scripts:

# Beispiel mit folgenden Variablen:
STATUSFILE=/root/script/backup.day
KEYFILE=backup/backup.key
BACKUPCLOSE=/root/script/backup-close

pacman -Sy rsnapshot
mkdir /extbackup/
mkdir /mnt/keyfs/
mount /mnt/usbstick-auf-dem-das-passwort-gespeichert-wir /mnt/keyfs/
echo "passwort-für-externe-hdd" /mnt/keyfs/$KEYFILE
echo 0 > $STATUSFILE
 
# Konfigurieren von rsnapshot: http://www.rsnapshot.org/howto/
# anlegen des Backup-Scripts Inhalt
# anpassen der Konfiguration am Anfang des Backup-Scripts
# anlegen von $BACKUPCLOSE

Inhalt des Backup-Scripts (./backup):

#!/bin/sh
 
########################################################################
##                                                                    ##
## Script to automate mounting crypted, external hdd, start backup    ##
## using rsnapshot.                                                   ##
##                                                                    ##
## by lyl  25.10.2008 - 10.02.2009                          GPL v3    ##
##                                                                    ##
########################################################################
 
#
# rsnapshot is configured in /etc/rsnapshot.conf
# parameters given to this script will be forwarded to rsnapshot
# see `man rsnapshot` for mor information
# 
# use cron or anacron to start backup automaticaly
#
# depends=('rsnapshot')
# optdepends=('anacron')
#
 
# filesystems
BACKUPFS=/dev/disk/by-id/usb-WDC_WD2500AB-1234567890-0\:0-part1
KEYFS=/dev/disk/by-id/usb-USB_DISK_USB_DISK_123456790-0\:0-part1
 
# files
STATUSFILE=/root/script/backup.day
KEYFILE=backup/backup.key
BACKUPCLOSE=/root/script/backup-close
 
# Number of hourly backups until more deep backups are made
DAYS=2
WEEKS=6
MONTHS=18
YEARS=90
 

# END OF CONFIG
 
#
# Mounting filesystems
#
echo "mounting filesystem containing the key-file..."
mount $KEYFS /mnt/keyfs/
 
echo "opening and mounting backup filesystem..."
cryptsetup luksOpen $BACKUPFS extbackup < /mnt/keyfs/$KEYFILE
mount /dev/mapper/extbackup /extbackup/
if (mount | grep -c "/dev/mapper/extbackup on /extbackup" > /dev/null)
then
       	echo "done"
else
	echo "fail"
	/root/script/backup-close
	exit 1
fi
 
#
# Start backing up
#
BACKUPNR=`cat $STATUSFILE`
echo "starting hourly backups (Nr. $BACKUPNR)..."
rsnapshot hourly $1
 
# calculation deepth
if (test $[$BACKUPNR % $DAYS] -eq 0); then
	BACKUPDAY=1
else
	BACKUPDAY=0
fi
 
if (test $[$BACKUPNR % $WEEKS] -eq 0); then
	BACKUPDAY=2
fi
 
if (test $[$BACKUPNR % $MONTHS] -eq 0); then
	BACKUPDAY=3
fi
 
if (test $[$BACKUPNR % $YEARS] -eq 0); then
	BACKUPDAY=4
fi
 

if (test $BACKUPDAY -ge 1)
then
	echo "done"
	echo "creating daily backup..."
	rsnapshot daily $1
	if (test $BACKUPDAY -ge 2)
	then
		echo "done"
		echo "creating weekly backup..."
		rsnapshot weekly $1
		if (test $BACKUPDAY -ge 3)
		then
			echo "done"
			echo "creating monthly backups..."
			rsnapshot monthly $1
			if (test $BACKUPDAY -ge 4)
			then
				echo "done"
				echo "creating yearly backups..."
				rsnapshot yearly $1
			fi
		fi
	fi
fi
echo `expr $BACKUPNR  + 1` > $STATUSFILE 
echo "done"
$BACKUPCLOSE
exit $?

Die Nummer das aktuellen Backups wird aus der Datei /root/script/backup.day ($STATUSFILE) gelesen:

1

Inhalt von /mnt/keyfs/backup/backup.key ($KEYFILE):

passwort-für-externe-hdd

Inhalt von /root/script/backup-close ($BACKUPCLOSE):

#!/bin/sh
ERRORCODE=0
echo "umounting key filesystem..."
umount /mnt/keyfs
 
echo "umounting backup filesystem..."
umount /dev/mapper/extbackup
 
echo "closing crypto device..."
cryptsetup luksClose extbackup
if (ls /dev/mapper | grep -c "extbackup" > /dev/null)
then
       	echo "fail"
	echo "if you have opened the backup-file-system, please close it and try again!"
	ERRORCODE=1
else
	if (ls /mnt/keyfs/ |grep -c "" > /dev/null)
	then
		echo "fail"
		echo "if you have opened the key-file-system, please close it and try again!"
		ERRORCODE=2
	fi
	echo "done"
fi
exit $ERRORCODE