resize_vm.sh

#!/bin/bash

if [ -z $1 ]; then
  echo "Usage: $0 <virtual_machine_name>"
  exit
fi

VM=$1
HOMEIMG=/home/$VM
OLDDISK=$HOMEIMG/$VM.img
NEWDISK=$HOMEIMG/$VM.new.img
PART=/dev/sda2
LVPART=/dev/vg/lv_root
ADD="+70G"

#  Look at current sizing
# virt-filesystems --long --parts --blkdevs -h -a $OLDDISK

# Create output disk. Virt-resize cannot do in-place disk modifications :(

echo "Creating $NEWDISK..."
truncate -r $OLDDISK $NEWDISK
truncate -s $ADD $NEWDISK

echo "Resizing..."
virt-resize --expand $PART --LV-expand $LVPART $OLDDISK $NEWDISK

echo "Done."