CentOS virt - Sep 2011 - kvm-qemu: unable to execute QEMU command savevm (monitor missing?)

System: CentOS Linux release 6.0 (final)
Kernel: 2.6.32-71.23.1.el6.x86_64
KVM: QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)
Libvirt: ibvirtd (libvirt) 0.8.1


Hi everyone,

I only recently subscribed to this list and hope you can shed some
light on the following error. I created a VM on my Centos 6 KVM
machine, used a qcow2 image and wanted to create a snapshot via 'virsh
snapshot-create' command:

//
[root at kvmhost ~]# virsh snapshot-create server01
error: internal error unable to execute QEMU command 'savevm': The
command savevm has not been found
\\

I googled before the post, found some [0] threads [1], but could not
find an answer how to solve the problem. If the kvm-qemu lacks the
support of a savevm monitor, how can I add one? Do I need to recompile
kvm-qemu with special flags or is simply a RPM package or a module
missing?

Thanks in advance,

 - Jason


[0] http://lists.centos.org/pipermail/centos-virt/2011-July/002557.html
[1] https://www.redhat.com/archives/libvirt-users/2011-August/msg00011.html

On Tue, Sep 27, 2011 at 6:48 AM, Jason Brian Friedrich <
mail at friedrich.org.uk> wrote:
> System: CentOS Linux release 6.0 (final)
> Kernel: 2.6.32-71.23.1.el6.x86_64
> KVM: QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)
> Libvirt: ibvirtd (libvirt) 0.8.1
>
>
> Hi everyone,
>
> I only recently subscribed to this list and hope you can shed some
> light on the following error. I created a VM on my Centos 6 KVM
> machine, used a qcow2 image and wanted to create a snapshot via 'virsh
> snapshot-create' command:
>
> //
> [root at kvmhost ~]# virsh snapshot-create server01
> error: internal error unable to execute QEMU command 'savevm': The
> command savevm has not been found
> \\
>
> I googled before the post, found some [0] threads [1], but could not
> find an answer how to solve the problem. If the kvm-qemu lacks the
> support of a savevm monitor, how can I add one? Do I need to recompile
> kvm-qemu with special flags or is simply a RPM package or a module
> missing?
>
> Thanks in advance,
>
>  - Jason
>
>
> [0] http://lists.centos.org/pipermail/centos-virt/2011-July/002557.html
> [1]
> https://www.redhat.com/archives/libvirt-users/2011-August/msg00011.html
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> http://lists.centos.org/mailman/listinfo/centos-virt

I ran into this too.  Unfortunately I haven't found a solution either, but
here's an interesting bug report that shows this effects all the way up to
Fedora 15,  https://bugzilla.redhat.com/show_bug.cgi?id=727709.  The one fix
mentioned 89241fe0, I've actually patched into the CentOS libvirt RPM, but
from testing it doesn't seem to be enough. I now can run the snapshot-create
command without error, but nothing appears to happen. I've tested creating
files, taking a snapshot, deleting files and reverting and nothing comes
back or changes. Also the qcow2 images don't change at all during this time
either. I'm working on applying the other commits mentioned in Comment #4,
but am running into problems since most of those commits are 0.9.0+ and I'm
patching CentOS's 0.8.1.

I'd love to know if anyone actually has snapshots working in CentOS 5 or 6.
This is kind of a critical feature to the entire virtualization process.

- Trey
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Hey Trey,

just a quick update. If you add the CR repo for CentOS 6.0 you will
get an updated RPM which solves the problem for me.

 - Jason

On Tue, Oct 4, 2011 at 01:43, Trey Dockendorf <treydock at gmail.com>
wrote:
>
>
> On Tue, Sep 27, 2011 at 6:48 AM, Jason Brian Friedrich
> <mail at friedrich.org.uk> wrote:
>>
>> System: CentOS Linux release 6.0 (final)
>> Kernel: 2.6.32-71.23.1.el6.x86_64
>> KVM: QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)
>> Libvirt: ibvirtd (libvirt) 0.8.1
>>
>>
>> Hi everyone,
>>
>> I only recently subscribed to this list and hope you can shed some
>> light on the following error. I created a VM on my Centos 6 KVM
>> machine, used a qcow2 image and wanted to create a snapshot via
'virsh
>> snapshot-create' command:
>>
>> //
>> [root at kvmhost ~]# virsh snapshot-create server01
>> error: internal error unable to execute QEMU command 'savevm':
The
>> command savevm has not been found
>> \\
>>
>> I googled before the post, found some [0] threads [1], but could not
>> find an answer how to solve the problem. If the kvm-qemu lacks the
>> support of a savevm monitor, how can I add one? Do I need to recompile
>> kvm-qemu with special flags or is simply a RPM package or a module
>> missing?
>>
>> Thanks in advance,
>>
>> ?- Jason
>>
>>
>> [0] http://lists.centos.org/pipermail/centos-virt/2011-July/002557.html
>> [1]
>> https://www.redhat.com/archives/libvirt-users/2011-August/msg00011.html
>> _______________________________________________
>> CentOS-virt mailing list
>> CentOS-virt at centos.org
>> http://lists.centos.org/mailman/listinfo/centos-virt
>
> I ran into this too. ?Unfortunately?I haven't found a solution either,
but
> here's an interesting bug report that shows this effects all the way up
to
> Fedora 15, ?https://bugzilla.redhat.com/show_bug.cgi?id=727709. ?The one
fix
> mentioned?89241fe0, I've actually patched into the CentOS libvirt RPM,
but
> from testing it doesn't seem to be enough. I now can run the
snapshot-create
> command without error, but nothing appears to happen. I've tested
creating
> files, taking a snapshot, deleting files and reverting and nothing comes
> back or changes. Also the qcow2 images don't change at all during this
time
> either. I'm working on applying the other commits mentioned in Comment
#4,
> but am running into problems since most of those commits are 0.9.0+ and
I'm
> patching CentOS's 0.8.1.
> I'd love to know if anyone actually has snapshots working in CentOS 5
or 6.
> This is kind of a critical feature to the entire virtualization process.
> - Trey
>
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> http://lists.centos.org/mailman/listinfo/centos-virt
>
>