Resizing Xen disk images

If you're in a situation where you're using disk images instead of LVM then you may occasionally need to resize your disks. It's really simple when you know how ;)

dd if=/dev/zero of=disk.img bs=1MB count=0 seek=20480
e2fsck -f -y disk.img
resize2fs -p disk.img

This will resize an existing image file to 20Gb.