kvm disk form

disk_form.sh

#! /bin/sh

### BEGIN INIT INFO
# Provides:          form_disk
### END INIT INFO

PATH=/sbin:/bin:/usr/sbin:/usr/bin

case "$1" in
    start)
        /path/to/update/script
        ;;
    stop|restart|reload)
        ;;
esac


##### below in seperate file #####

before_reboot(){
	rm -f /etc/udev/rules.d/70-persistent-net.rules
	(echo d; echo 2; echo n; echo p; echo 2; echo 1018 ; echo; echo t; echo 2; echo 8e; echo w ) | sudo fdisk /dev/vda
	touch /var/run/rebooting-for-table-update
	update-rc.d form_disk defaults
	reboot
}

after_reboot(){
	pvresize /dev/vda2
	lvresize /dev/vg_centos6/lv_root /dev/vda2
	resize2fs /dev/mapper/vg_centos6-lv_root
	rm /var/run/rebooting-for-table-update
	update-rc.d form_disk remove
}

if [ -f /var/run/rebooting-for-table-update ]; then
    after_reboot
else
    before_reboot
fi