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+#!/bin/sh
+
+#==============================================================================+
+# File name   : resizevm.sh
+# Begin       : 2013-04-18
+# Last Update : 2013-04-23
+# Version     : 1.0.0
+#
+# Description : Shell script used to resize Virtual Machine image.
+#
+# Website     : https://github.com/fubralimited/CentOS-KVM-Image-Tools
+#
+# Author: Nicola Asuni
+#
+# (c) Copyright:
+#               Fubra Limited
+#               Manor Coach House
+#               Church Hill
+#               Aldershot
+#               Hampshire
+#               GU12 4RQ
+#               UK
+#               http://www.fubra.com
+#               support@fubra.com
+#
+# License:
+#    Copyright (C) 2012-2013 Fubra Limited
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+#    See LICENSE.TXT file for more information.
+#==============================================================================+
+
+# USAGE EXAMPLE:
+# sh resizevm.sh VM_NAME VM_SIZE
+# sh resizevm.sh centosvm 20G
+
+# NOTE: This script assume that the VM images are created using the centoskvm.sh
+#       script and located at /data/images
+
+# ensure script is being run as root
+if [ `whoami` != root ]; then
+   echo "ERROR: This script must be run as root" 1>&2
+   exit 1
+fi
+
+# check for vm name
+if [ -z "$1" ]; then
+	echo "ERROR: No argument supplied. Please provide the Virtual machine name."
+	exit 1
+fi
+
+# name of the image
+VMNAME=$1
+
+# check for new size
+if [ -z "$2" ]; then
+	echo "ERROR: Missing size argument. Please provide the Virtual machine name new size."
+	exit 1
+fi
+
+echo "Resizing VM ..."
+
+# new size of the image
+VMSIZE=$2
+
+# extract VM file name
+VMFILE=$(virsh dumpxml $VMNAME | grep "<source file='" | sed "s/[\t ]*<source file='\/data\/images\///" | sed "s/'\/>//")
+
+export TMPDIR=/data/tmp/
+
+# shut the virtual machine down
+virsh shutdown $VMNAME
+
+# change directory
+cd /data/images
+
+# clone VM image
+cp -f $VMFILE $VMFILE.tmp
+
+# resize the cloned image (i.e. 20 GB)
+qemu-img resize $VMFILE.tmp $VMSIZE
+
+# resize the partitions
+virt-resize --expand /dev/vda2 --LV-expand /dev/vg_main/lv_root $VMFILE $VMFILE.tmp
+
+# make a backup of the VM for any evenience:
+mv -f $VMFILE $VMFILE.backup
+
+# sparsify image
+virt-sparsify --format qcow2 --compress $VMFILE.tmp $VMFILE
+
+# remove the resized image
+rm -f $VMFILE.tmp
+
+# set file ownership
+chown qemu:qemu $VMFILE
+
+# restart the virtual machine
+virsh start $VMNAME
+
+# if the new image works fine, then we can delete the backup image:
+#rm -rf $VMFILE.backup
+
+echo "Process Completed. Please try the new image and delete the backup file if everything is OK."
+
+#==============================================================================+
+# END OF FILE
+#==============================================================================+