Not sure what you mean by re-image a VM. If the VM is a file, you can easily
make a copy and restore to that point at any time. Are you asking if you can
boot into a restore mode and restore from a CD or ISO? I don't see why not,
you just need to run the VM with the proper mount points. On the command
line, you just tell it to boot from the CD/ISO, and it should do what you
are suggesting. Check this section of the KVM community page. I think what
you do is use "-boot d" and specify the CD/ISO as the CDROM device.

https://help.ubuntu.com/community/KVM
KVM from the command line

KVM is very similar to qemu and it is possible to run machines from the
command line. The basic syntax is :

kvm -m 512 -hda disk.img -cdrom ubuntu.iso -boot d -smp 2


   - -m = memory (in MB)
   - -hda = first hard drive
      - You can use a number of image file types including .img, .cow
      -

      You can also boot a hard drive. *Be careful with this option as you do
      not want to boot the host root partition*
      - Syntax -hda /dev/sda
         - This will call your grub menu from your MBR when you boot kvm.
      - -cdrom can be an iso image or a CD/DVD drive.
   - -boot [a|c|d|n] boot on floppy (a), hard disk (c), CD-ROM (d), or
   network (n)
   - -smp = number of CPU
   - -alt-grab change Ctrl-Alt mouse grab combination for Ctrl-Alt-Shift
   (very practical if you often use some control key combinations like
   Ctrl-Alt-Del or Windows-E)

There are a number of additional options and additional help is available
with :





On Sun, Dec 21, 2008 at 8:25 AM, Scott Raley -ITC <[email protected]>wrote:

> Do you know if you can save the VM and reimage the VM if you mess something
> up?  I'm building an ubuntu server now but I haven't found a clear answer
> if
> I can reimage a VM on the desktop side.
>


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