KVM backup.sh
# Set the language to English so virsh does it's output
# in English as well
# LANG=en_US
SCRIPTNAME=kvm-backup
# Local backup folder
LOCALBKFOLDER=/arc/vm
# Clean local backup folders older then days
ERASEBCKPDAYS=3
# Mounted network backup folder
NETBKFOLDER=/mnt/backup/VMs
echo "Start backup script at $(date +'%d-%m-%Y %H:%M:%S')" | systemd-cat -p info -t $SCRIPTNAME
# List domains
DOMAINS=$(virsh list | tail -n +3 | awk '{print $2}')
for DOMAIN in $DOMAINS; do
echo "Starting backup for $DOMAIN on $(date +'%d-%m-%Y %H:%M:%S')" | systemd-cat -p info -t $SCRIPTNAME
# Generate the backup folder URI - this is something you should # change/check BACKUPFOLDER=$LOCALBKFOLDER/$DOMAIN/$(date +%d-%m-%Y) NBACKUPFOLDER=$NETBKFOLDER/$DOMAIN echo "Create BACKUPFOLDER = $BACKUPFOLDER" | systemd-cat -p info -t $SCRIPTNAME mkdir -p $BACKUPFOLDER
echo "Create NBACKUPFOLDER = $NBACKUPFOLDER" | systemd-cat -p info -t $SCRIPTNAME
mkdir -p $NBACKUPFOLDER # Get the target disk TARGETS=$(virsh domblklist $DOMAIN --details | grep disk | awk '{print $3}')
# Get the image page IMAGES=$(virsh domblklist $DOMAIN --details | grep disk | awk '{print $4}')
# Create the snapshot/disk specification DISKSPEC=""
for TARGET in $TARGETS; do DISKSPEC="$DISKSPEC --diskspec $TARGET,snapshot=external" done echo "Create snapshot for $DOMAIN, DISKSPEC = $DISKSPEC" | systemd-cat -p info -t $SCRIPTNAME virsh snapshot-create-as --domain $DOMAIN --name "backup-$DOMAIN" --no-metadata --atomic --disk-only $DISKSPEC
if [ $? -ne 0 ]; then echo "Failed to create snapshot for $DOMAIN" | systemd-cat -p warning -t $SCRIPTNAME exit 1 fi
# Copy disk image for IMAGE in $IMAGES; do NAME=$(basename $IMAGE) echo "Sync $IMAGE and $BACKUPFOLDER/$NAME" | systemd-cat -p info -t $SCRIPTNAME rsync -ahW --no-o --no-g --progress $IMAGE $BACKUPFOLDER/$NAME done
# Merge changes back BACKUPIMAGES=$(virsh domblklist $DOMAIN --details | grep disk | awk '{print $4}')
for TARGET in $TARGETS; do echo "Blockcommit for $DOMAIN, TARGET = $TARGET" | systemd-cat -p info -t $SCRIPTNAME virsh blockcommit $DOMAIN $TARGET --active --pivot # 1>/dev/null 2>&1
if [ $? -ne 0 ]; then echo "Could not merge changes for disk of $TARGET of $DOMAIN. VM may be in invalid state." | systemd-cat -p warning -t $SCRIPTNAME exit 1 fi done
# Cleanup left over backups for BACKUP in $BACKUPIMAGES; do
echo "Remove $BACKUP" | systemd-cat -p info -t $SCRIPTNAME
rm -f $BACKUP done
# Dump the configuration information. echo "Create xml for $DOMAIN - $BACKUPFOLDER/$DOMAIN.xml" | systemd-cat -p info -t $SCRIPTNAME virsh dumpxml $DOMAIN > $BACKUPFOLDER/$DOMAIN.xml # 1>/dev/null 2>&1
echo "Create xml for $DOMAIN - $NBACKUPFOLDER/$DOMAIN.xml" | systemd-cat -p info -t $SCRIPTNAME
virsh dumpxml $DOMAIN > $NBACKUPFOLDER/$DOMAIN.xml
# Copy disk to network backup disk
for IMAGE in $IMAGES; do NAME=$(basename $IMAGE)
echo "Copy $BACKUPFOLDER/$NAME to $NBACKUPFOLDER/$NAME" | systemd-cat -p info -t $SCRIPTNAME cp $BACKUPFOLDER/$NAME $NBACKUPFOLDER/$NAME done
echo "Finished backup of $DOMAIN at $(date +'%d-%m-%Y %H:%M:%S')" | systemd-cat -p info -t $SCRIPTNAME done
# Cleanup local backup folders echo "Delete local backups $LOCALBKFOLDER older then $ERASEBCKPDAYS days" | systemd-cat -p info -t $SCRIPTNAME
find $LOCALBKFOLDER/* -ctime +$ERASEBCKPDAYS -type d -exec rm -r {} +
echo "Finished backup script at $(date +'%d-%m-%Y %H:%M:%S')" | systemd-cat -p info -t $SCRIPTNAME exit 0
See also
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