Simple LibVirt//KVM backup with memory dump.

gistfile1.txt

#!/bin/bash
#
# VirSH Simple Backup ([email protected])
#
# Version 1.0.1 - 20130301 (1362127750)
#

VIRSH="/usr/bin/virsh"
QEMU_IMG="/usr/bin/qemu-img"
backup_dir="/backups"
tmp_dir="/tmp"

user_domain_names="$1"
snapshot_name="$2"
running_domain_names=$(virsh list | tail -n+3 | awk '{print $2;}')

if [ -z "$user_domain_names" -o -z "$snapshot_name" ]; then
  echo "Usage: $0 '<domain name(s)>|all' <snapshot name>"
	exit 1
fi

domain_names=""
if [ "$user_domain_names" == 'all' ]; then
	echo "Domain list:"
	domain_names=$running_domain_names
	echo "$domain_names"
else
	for domain_name in $user_domain_names; do
		for running_domain_name in $running_domain_names; do
			if [ "$running_domain_name" == "$domain_name" ]; then
				domain_names="$domain_name $domain_names"
				break
			fi
		done
	done
fi

echo "Backing up: $domain_names"
for domain_name in $domain_names; do

	echo "Backing up domain '$domain_name'"

	server_backup_dir="$backup_dir/$snapshot_name/$domain_name"

	if [ -d "$server_backup_dir" ]; then
		echo "Directory '$server_backup_dir' already exist skipping"
		continue
	fi

	mkdir -p $server_backup_dir
	if [ $? -ne 0 ]; then
		echo "Failed to create directory '$server_backup_dir'"
		exit 2
	fi

	echo "Dumping domain XML for '$domain_name'"
	$VIRSH dumpxml $domain_name > $server_backup_dir/$domain_name.xml
	if [ $? -ne 0 ]; then
		echo "Domain dump failed for '$domain_name'"
		exit 2 
	fi

	echo "Saving domain '$domain_name' memory and CPU state"
	date_start=$(date +"%s")
	$VIRSH save $domain_name $tmp_dir/$domain_name.save >/dev/null
	if [ $? -ne 0 ]; then
		echo "Domain dump failed for '$domain_name'"
		exit 2 
	fi

	echo "Creating disk snapshot for '$domain_name'"
	$VIRSH snapshot-create-as $domain_name $snapshot_name "Automatic snapshot by backup system - $snapshot_name" >/dev/null
	if [ $? -ne 0 ]; then
		echo "Domain dump failed for '$domain_name'"
		exit 2 
	fi

	echo "Restoring '$domain_name'"
	$VIRSH restore $tmp_dir/$domain_name.save >/dev/null
	if [ $? -ne 0 ]; then
		echo "Domain dump failed for '$domain_name'"
		exit 2 
	fi

	date_stop=$(date +"%s")

	date_diff=$(($date_stop - $date_start))
	echo "$(($date_diff / 60)) minutes and $(($date_diff % 60)) seconds elapsed."

	echo "Moving memory and CPU state for '$domain_name' to '$server_backup_dir'"
	mv $tmp_dir/$domain_name.save $server_backup_dir/$domain_name.save

	disk_images=$(cat $server_backup_dir/$domain_name.xml | awk '/source file/ {match($0, /source file='"'(.+)'"'\/>/, a); print substr($0, a[1, "start"], a[1, "length"])}')

	echo "Copying disk images snapshots"
	result=0
	for image in $disk_images; do
		backing_file=`$QEMU_IMG info $image | awk '/backing file/ { print $3}'`
		if [ -z "$backing_file" ]; then
			$QEMU_IMG convert -f qcow2 -O qcow2 -s $snapshot_name $image $server_backup_dir/$(basename $image) >/dev/null 
		else
			echo "Using backing file '$backing_file'"
			$QEMU_IMG convert -f qcow2 -O qcow2 -B $backing_file -s $snapshot_name $image $server_backup_dir/$(basename $image) >/dev/null 
		fi
		if [ $? -ne 0 ]; then
			echo "Snapshot extraction failed for image '$image'"
			result=1
		fi
	done

	echo "Deleting snapshots for '$domain_name'"
	if [ $result -eq 0 ]; then
		$VIRSH snapshot-delete $domain_name $snapshot_name
	fi

done