[Novalug] Backup/partition

[Paul]

On Sat, January 24, 2009 9:43 am, Luther wrote:
> Hello;
>     I need to know where I might find information about how to partition
> a drive to place a backup of linux in case your system might go down.!

To do a full backup, one can do a dump to a partition that is not being
used for the OS.  This would need to be set up in advance, or can be
changed later with carefull manipulation.  You won't be protecting against
hard drive failure, but it's nice to be able to restore the OS when
needed.  If using LVM, this is a bit easier for manipulation.  I guess
there is allot in question here, what FS are you using?  There are many,
EXT3, LVM, ZFS.

Most are probably EXT3 or LVM, Open Solaris uses ZFS.

To backup each partition with compression:
dump -h 0 -y -f $BKUPFULLPATH$DATESTAMP"_boot.dump" /dev/$BOOTDISK

One can also do live full backups with LVM:
dump -h 0 -y -f $BKUPFULLPATH$DATESTAMP"_full.dump" $VOLGROUP$LVSNAPNAME

I do it via script in cron jobs daily:

#!/bin/bash
BKUPDISK="hdb1"   #This is the 2nd hd or spare partition for the backups
to go
BOOTDISK="hda1"
MAXDISKSPACE="85"
MOUNTDIR="/mnt/"
BKUPDIR="/mnt/backup/"
BKUPDIRSEARCH="`echo $BKUPDIR | awk -F"/" '{print $3}'`"
BKUPDIRHOST="`hostname`.`uname -a | awk '{print $3}'`"
BKUPFULLPATH="$BKUPDIR$BKUPDIRHOST/"
LVSNAPNAME="lvsnap"
DATESTAMP="`date '+%F''-%R' | sed 's/://g'`"
VOLGROUP="/dev/VolGroup00/"
LV="LogVol00"
DIRNOTDELETE="backupskeep"

if [ ! -d $BKUPDIR ]
then
        mkdir $BKUPDIR
        if [ ! -d $BKUPDIR ]
        then
                echo "The dir $BKUPDIR will not create!  Exitting program..."
                echo
                exit 0
        fi
        chmod 700 $BKUPDIR
fi

checkmount () {
        CHECKMOUNTANDSPACE="`df -h | awk "/$BKUPDISK/ && /$BKUPDIRSEARCH/"
| awk '{print $5}' | awk -F"%" '{print $1}'`"
}

checkmount

if [ -z $CHECKMOUNTANDSPACE ]
then
        mount /dev/$BKUPDISK $BKUPDIR
        checkmount
        if [ -z $CHECKMOUNTANDSPACE ]
        then
                echo "Problems mounting backup drive!  Exitting program..."
                echo
                exit 0
        fi
fi

checkmount
echo "Space is $CHECKMOUNTANDSPACE%"
echo

while [ $CHECKMOUNTANDSPACE -gt $MAXDISKSPACE ]
do
        FILETODELETE="`find $BKUPDIR -type f | grep -v $DIRNOTDELETE | awk
-F"/" '{print $5}' | sort | head -1`"
        rm -rf `find $BKUPDIR -name $FILETODELETE | grep -v $DIRNOTDELETE`
        echo "$FILETODELETE deleted..."
        sleep 1
        checkmount
        echo "Space is now $CHECKMOUNTANDSPACE%"
        echo
done

checklv () {
LVCHECK="`lvdisplay | grep $VOLGROUP$LVSNAPNAME | awk '{print $3}'`"
}

echo
checklv

if [ -z $LVCHECK ]
then
        lvcreate -L1G -s -n $LVSNAPNAME $VOLGROUP$LV
        checklv
        if [ -z $LVCHECK ]
        then
                echo "The LV is not there!  Exitting program..."
                echo
                exit 0
        fi
fi

if [ ! -d $BKUPFULLPATH ]
then
        echo "backup path not there, trying to create..."
        echo
        mkdir $BKUPFULLPATH
        if [ -d $BKUPFULLPATH ]
        then
                chmod 700 $BKUPFULLPATH
        fi
        if [ ! -d $BKUPFULLPATH ]
        then
                echo "backup path still not there, exitting program..."
                echo
                exit 0
        fi
fi

dump -h 0 -y -f $BKUPFULLPATH$DATESTAMP"_boot.dump" /dev/$BOOTDISK
echo
dump -h 0 -y -f $BKUPFULLPATH$DATESTAMP"_full.dump" $VOLGROUP$LVSNAPNAME
chmod 600 $BKUPFULLPATH*
umount $BKUPDIR
lvremove -f $VOLGROUP$LVSNAPNAME