Increase the hard disk space of a XEN Virtual Machine
Had a VM today running out of disk space, so i shut it down and made a copy of the container as a backup, i strongly suggest you should make a copy too!
i added 1 GB to the container file, in my case "debian-amavis.img"
dd if=/dev/zero bs=1M count=1024 >> debian-amavis.img
then i just ran this
resize2fs -f debian-amavis.img
and voila, after the reboot i had 1.1GB free, again!