[libvirt-users] Create multiple domains from single saved domain state (is UUID/name fixed?)

[Michael Ravits]

Hi Jonas,

I asked a similar question here last week. You could find it by searching
for this topic in the mailing list archives: "Clone VM with saved state".
That being said I'd be very glad if you could update here when you find a
complete solution.

- Michael

On Mon, Apr 18, 2016 at 9:49 PM, Jonas Finnemann Jensen <jonasfj at mozilla.com
> wrote:

> Hi,
>
> I would like to save a running domain (ie. disk + memory) and be able to
> restore it multiple times creating duplicates of the orignal domain all
> starting from the same state.
> Use case:
> I'm building a task-processing system for use in a CI flow.
> I want to run multiple VMs in parallel using the same image (always
> starting from the same state).
> And to avoid needlessly booting between each task, I would like to save
> (and distribute) the domain state, so that I just restore from memory.
>
> However, I can't seems to change the UUID or the name of a domain once it
> is saved.
> Nor do I seem able to rename a domain while it is running.
>
> I can obviously duplicate both the disks and the file to which I saved the
> domain state using "virsh save".
> But I seem unable to rename before I restore.. Any ideas?
>
> Could I do this with snapshots? I suspect not since I see
> virDomainSnapshotRedefinePrep() calling
> virDomainDefCheckABIStability which raises the error here:
> https://fossies.org/dox/libvirt-1.3.3/domain__conf_8c_source.html#l17991
>
> Out of curiosity does anyone know what horrors might befall me if I were
> to remove the lines protecting against name and UUID changes? Then compile
> my own libvirt...
> The comment in the code says name can be changed, but I'm guessing I would
> have to change the UUID too. Does anyone see how that would create issues?
> I'm not sure how libvirt uses the UUID internally.
>
> --
> Regards Jonas Finnemann Jensen.
>
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