LVM Daily Snapshot – Only works with 1 SNAPSHOT
if you have more then 1 snapshots, this script can still work with a slight modification. (email me if you want me to look into that modification)
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HOW TO MAKE SNAPSHOT SCRIPT
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This script only works when there is one logical volume snapshot!
The cron job is set to run once a day at one minute after midnight!
MAKE THE LVSNAP SCRIPT – (note might need to remove the tabs/extra spaces in if block for this to work – bash can be picky)
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#!/bin/bash
DATE1=`date +%D | tr / -`
SNAPNAME=daily-$DATE1
LV1=/dev/this/root
echo Creating Daily Snapshot of $LV1 for today $DATE1
echo Name of new snapshot: $SNAPNAME
echo First Deleting Old Snapshot If there are any…
LVS0=`lvscan`
#echo -e “HERE ARE ALL THE LOGICAL VOLUMES\n${LVS0}\n”
if echo $LVS0 | grep -q “Snapshot”
then
LVS1=`lvscan | grep -i snapshot | cut -f2 -d”‘”`
#LVS1=`echo $LVS0 | grep -i snapshot | awk ‘{print $3;}’ | tr \’ ” “`
echo FOUND!!!! Found this snapshot: $LVS1
echo “====STATS OF SNAPSHOT TO BE DELETED:====”
lvdisplay $LVS1
echo DELETING SNAPSHOT: $LVS1
echo lvremove -f $LVS1
lvremove -f $LVS1
echo “Deleted old snapshot, proceeding to make new snapshot”
else
echo “Other snapshots not found, proceeding to make new snapshot”
fi
echo CREATING: … new snapshot …
echo lvcreate –size 15g –snapshot –name $SNAPNAME $LV1
lvcreate –size 15g –snapshot –name $SNAPNAME $LV1
echo “DONE!”
echo -e “HERE ARE THE NEW LOGICAL VOLUMES\n`lvscan`\n”
MAKE THE WRAPPER SCRIPT (FOR CRON JOB)
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#!/bin/bash
echo “[`date`] RUNNING lvsnap.sh BY KOSTIA” >> /var/log/syslog
date >> /var/log/lvsnap.log
/jobs/lvsnap.sh >> /var/log/lvsnap.log
TYPE crontab -r AS root USER & MAKE THIS ENTRY
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1 0 * * * /jobs/lvjobrun.sh
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