virt-builder looks like some fancy guest/host interaction related to building VM images. What I'm looking for is more like: virsh save running_domain saved-domain-A.img cp saved-domain-A.img saved-domain-B.img virsh save-image-edit saved-domain-B.img // Change the network, possibly MAC, VNC port Then in parallel I want to do: virsh restore saved-domain-A.img virsh restore saved-domain-B.img So that I have two instances of the same virtual machine starting from the same state. This way I can reset the VMs without having to reboot them (booting is rather slow). I practice I'll probably have ~16 instances at the same time. Constantly being reset to the same state. I tried with QEMU, and it's seems totally doable with savevm, copy file, then doing loadvm twice in parallel. (I'll be using a separate network for each VM, so I can be sure which one I'm talking to). Is this doable with libvirt, or am I better off using QEMU directly? and how? I couldn't do internal snapshots with --live, and snapshot-revert says it can't revert to external snapshots yet :) (using QEMU directly would certainly leave me with a lot of manual network configuration) -- Regards Jonas Finnemann Jensen. 2016-04-19 2:23 GMT-07:00 Martin Kletzander <mkletzan@redhat.com>:
On Mon, Apr 18, 2016 at 10:05:02PM +0300, Michael Ravits wrote:
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
What I *think* Jones wants is to use virt-builder, it could cause some problems if you started all of them. What Michael wants is:
virsh save running_domain saved-image-file.img virsh save-image-edit saved-image-file.img
Hope that helped, Martin
On Mon, Apr 18, 2016 at 9:49 PM, Jonas Finnemann Jensen <
jonasfj@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.
_______________________________________________ libvirt-users mailing list libvirt-users@redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users
libvirt-users mailing list libvirt-users@redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users