3

Is it possible to save the state of a virtual machine under QEMU/KVM/libvirt (on x86-64) to disk like you can on vmware Player, that means:

  • The RAM and CPU/system state is save to disk
  • The OS is stopped from the outside (no suspend to disk within the VM)
  • The VM can be continued after rebooting the host?

If it is possible, would it need special drivers within the VM? Which one for Linux and Windows 7 guests?

4

The virt-manager window has a feature "shut down" -> "save".

Additional drivers are not required. I think the obvious bad thing happens with system time inside the guest. I don't know if there are guest drivers available to let the clock catch up.

  • 3
    So it has. Thanks very much, had not spotted it. For everyone who is interested, this needs space in /home/$USER/.config/libvirt/qemu/save which may be a link to a folder on a larger disk if needed. – Ned64 Apr 24 '17 at 17:31
3

The Red Hat Virtualization Deployment and Administration Guide has a section on this, but if you don't have access then it wont be much help...

In a nutshell, what you are looking for is the virsh dompmsuspend command and option. The GUI utilities for KVM are okay but leave a LOT of functionality out. The virsh command can do anything you need it to, given the right options and parameters. I am not familiar with 'suspending' a KVM guest, so I can't really give you much guidance, but the documentation should have everything you need.

  • Thanks for the reply! That's what @ridgy suggested (and @sourcejedi detailed in its comment). Used virt-manager for the moment but shall try this out in the beloved command line, as well. – Ned64 Apr 24 '17 at 17:38
3

To achieve the same thing as VMmware's "Suspend" in virsh, do:

virsh managedsave <domain-name>

The machine can later be resumed with

virsh start <domain-name>

On my tested host (Ubuntu Server 14.04), the save file is stored at:

/var/lib/libvirt/qemu/save/<domain-name>.save
  • Thanks, this is the command line equivalent of the accepted answer and useful as an addition. – Ned64 Aug 6 at 15:53

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.