Re: kvm-qemu: unable to execute QEMU command savevm (monitor missing?)

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On Tue, Sep 27, 2011 at 6:48 AM, Jason Brian Friedrich <mail@xxxxxxxxxxxxxxxx> 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@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
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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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