[libvirt-users] Associating a statefile with an image

sethuraman subbiah
2011-07-02T15:59:04Z

Hi ,

I am trying to perform offline migration (i.e) Create an incremental image using
the qcow format, transfer the vm memory state to a state fie.Use the image and
statefile together as a template. Now create a new vm using the template. I can
successfully do it using the following commands :

Save phase :
stop
migrate "exec:gzip -c > STATEFILE.gz"
qemu-img
qemu-img create -b BASE_img -f qcow2 INCRE_img

Restore phase :
qemu-kvm -m 1024 -hda INCRE_img -incoming "exec: gzip -c -d
STATEFILE.gz"

And it works fine. But I am not able to find the vm with virt-manager or other
libvirt based tools.

If I use :
virsh save <dom_id> STATEFILE

I can restore using "virsh restore STATEFILE" but I want to associate
this with the incremental image that I created, but I dont know how. I think it
saves the existing vm's xml file along with the STATEFILE, thus I am not
able to change the disk image to the incremental image.

Thus ,
1. Either I should find a way to make vms created using qemu-kvm appear in
libvirt-based tools.

OR

2. Find a way to associate the virsh save STATEFILE with a incremental image.

Any help or hint with respect to these will be very helpful. I am try to do
cloning with minimal cost. This takes only 25 seconds ( to create STATEFILE) and
creating incremental image is instantatenous . But I want to use the vm
monitoring code based on libvirt. And it makes life difficult.

Thanks for your help.

-
Regards,
Sethuraman Subbiah

Graduate Student - NC state University
M.S in Computer Science


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