Creating Snapshots of a backup using LVM snapshot | Just my blog


Creating Snapshots of a backup using LVM snapshot

Normally I used to have a backup-retention-script in place that will create a TAR-ball of the backup data (using Herakles). But this way I was not able to have a retention of longer then 3 days :-(

So I had to look into another solution, I could add a new harddrive in the server... but there should be something else possible. So I ended up by using LVM snapshots. So I created a Volume group of about 100GB. In that volume group I created a logical volume of about 30GB, which is enough (and if not, we can 'grow' the Filesystem thanks to LVM :-) )

After having all that done, I've created a script located in /root/scripts/lvm-snapshot. This script runs every midnight and creates a snapshot.

# Create LVM Snapshots
CURRENT_SNAPNAME="snap-"$(date "+%Y%m%d%H%M%S")

echo $LINE
df -h /mnt/data
echo $LINE
$LVMSNAPSHOTCMD 2> /dev/null
CURRENT_SNAPSHOT_COUNT=$(lvdisplay | grep "^  LV Name                /dev/vol_backup/snap" | sort | awk '{ print $3 }' | wc -l)

if [ $OVERFLOW -gt 0 ];
        echo $LINE
        for files in  $(lvdisplay | grep "^  LV Name                /dev/vol_backup/snap" | sort | awk '{ print $3 }' | head -n$OVERFLOW);
                 /usr/sbin/lvremove -f $files 2> /dev/null
echo $LINE
/usr/sbin/vgdisplay vol_backup
echo $LINE
/usr/sbin/lvdisplay $VOLUME2SNAPSHOT

And the crontab entry is:

# crontab -l
0 0 * /root/scripts/lvm-snapshot

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