11:08 a.m.
In Fedora 10 I've managed to get libvirt to call the emulator with
custom arguments so I can invoke -snapshot. I just replaced the
emulator in /usr/bin with my own script which adds the argument and then
calls the original emulator. This works fine. And the snapshot works
fine. I can make lots of changes and when I shutdown and restart then
all the changes are forgotten. Now after I'm satisfied with some
changes I want to save the snapshot back to the image file. I've tried
"Ctrl-Alt-s", but this does not work. I tried finding the QEMU console,
but Serial Console is grayed out in the menu. I don't know if that
would help anyway since this was a raw image and not qcow2 so I don't
think 'savevm' and 'loadvm' would work with raw.
Can someone tell me how to save these snapshots back to the image file?
Thanks.
Regards,
Gerry
3:24 p.m.
Gerry Reno wrote:
In Fedora 10 I've managed to get libvirt to call the emulator
with
custom arguments so I can invoke -snapshot. I just replaced the
emulator in /usr/bin with my own script which adds the argument and
then calls the original emulator. This works fine. And the snapshot
works fine. I can make lots of changes and when I shutdown and
restart then all the changes are forgotten. Now after I'm satisfied
with some changes I want to save the snapshot back to the image file.
I've tried "Ctrl-Alt-s", but this does not work. I tried finding the
QEMU console, but Serial Console is grayed out in the menu. I don't
know if that would help anyway since this was a raw image and not
qcow2 so I don't think 'savevm' and 'loadvm' would work with raw.
Can someone tell me how to save these snapshots back to the image
file? Thanks.
We need a way to these things:
1. Have sysadmins enable the "monitor" when necessary.
2. Be able to issue multi-Ctrl key (preferably user-defineable)
sequences for performing actions with the hypervisor.
3. Have every aspect of every command available in "monitor" available
from an API.
Right now, I cannot gain access to the "monitor" in libvirt. Therefore
I cannot issue something like "savevm", "loadvm", or "commit
hda" or any
of these commands necessary for working with snapshots. I also am
unable to send Ctrl key sequences such as Ctrl-a-s to write the snapshot
to the image file. Therefore, all routes are closed. The current
approach of just locking everything down is wrong. That decision should
be left up to the user as to how much security they wish to enable in
their particular environment.
Regards,
Gerry
3:33 p.m.
On Mon, Apr 20, 2009 at 04:24:28PM -0400, Gerry Reno wrote:
Right now, I cannot gain access to the "monitor" in
libvirt. Therefore
I cannot issue something like "savevm", "loadvm", or "commit
hda" or any
of these commands necessary for working with snapshots. I also am
unable to send Ctrl key sequences such as Ctrl-a-s to write the snapshot
to the image file. Therefore, all routes are closed. The current
approach of just locking everything down is wrong. That decision should
be left up to the user as to how much security they wish to enable in
their particular environment.
Your POV, my point of view is that an API should be provided if you
can provide it consistently and reliably, otherwise it should not be
turned into an API.
libvirt was not designed as an API for QEmu internals, maybe it's what
you need, but that would have to be offered by the QEmu people
themselves !
Daniel
--
Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/
daniel(a)veillard.com | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library http://libvirt.org/
4 a.m.
On Mon, Apr 20, 2009 at 12:08:48PM -0400, Gerry Reno wrote:
In Fedora 10 I've managed to get libvirt to call the emulator
with
custom arguments so I can invoke -snapshot. I just replaced the
emulator in /usr/bin with my own script which adds the argument and then
calls the original emulator. This works fine. And the snapshot works
fine. I can make lots of changes and when I shutdown and restart then
all the changes are forgotten. Now after I'm satisfied with some
changes I want to save the snapshot back to the image file. I've tried
"Ctrl-Alt-s", but this does not work. I tried finding the QEMU console,
but Serial Console is grayed out in the menu. I don't know if that
would help anyway since this was a raw image and not qcow2 so I don't
think 'savevm' and 'loadvm' would work with raw.
Can someone tell me how to save these snapshots back to the image file?
Thanks.
That's not supported at this time. The built in QCow2 snappshotting in
QEMU is also rather dangerous with it known to corrupt data in a number
of circumstances. We'd like to expose this functionality in libvirt
eventually, but we've not made it a priority yet since its not really
considered stable upstream either.
Daniel
--
|: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :|
|: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
5694
days inactive
5695
days old
3 comments
3 participants
participants (3)
-
Daniel P. Berrange -
Daniel Veillard -
Gerry Reno