[Qemu-devel] invoking monitor command without Ctrl+Alt+2

[Qemu-devel] invoking monitor command without Ctrl+Alt+2

[siddharth srivastava]

Hi

I am working on a virtualization project for which I am using
Qemu(0.13) + KVM.I am trying to get an automated switch to live
migration based on certain condition.
According to [1], it is possible to start migration via Qemu Monitor.
Since I am trying to invoke this via C code, is it possible to do so ?
Also is it possible to save ram snapshot without stopping the VM from
the code (probably by reusing some qemu code ?) Any pointers would
also be helpful.


[1]: http://www.linux-kvm.org/page/Migration

Thanks
-- 
Regards
Siddharth Srivastava

Re: [Qemu-devel] invoking monitor command without Ctrl+Alt+2

[Eric Blake]

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On 07/12/2012 01:17 PM, siddharth srivastava wrote:
> Hi
> 
> I am working on a virtualization project for which I am using
> Qemu(0.13) + KVM.

That's rather old; we're now at 1.1, and there have been some migration
bugs fixed in the meantime.

>I am trying to get an automated switch to live
> migration based on certain condition.
> According to [1], it is possible to start migration via Qemu Monitor.
> Since I am trying to invoke this via C code, is it possible to do so ?

Yes.  See libvirt if you want an example of C code that starts a
migration via the monitor.

> Also is it possible to save ram snapshot without stopping the VM from
> the code (probably by reusing some qemu code ?) Any pointers would
> also be helpful.

Again, you may be better served by reusing what libvirt already supports
on this front.

-- 
Eric Blake   eblake@redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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Re: [Qemu-devel] invoking monitor command without Ctrl+Alt+2

[siddharth srivastava]

Hi

I also see that qemu 0.13 has live migration in inbuilt.Does it also
uses libvirt behind the scenes to create live ram snapshot ?

Re: [Qemu-devel] invoking monitor command without Ctrl+Alt+2

[Eric Blake]

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On 07/12/2012 10:14 PM, siddharth srivastava wrote:
> Hi
> 
> I also see that qemu 0.13 has live migration in inbuilt.Does it also
> uses libvirt behind the scenes to create live ram snapshot ?

No, you've got it backwards.  Qemu does not use libvirt.  Rather,
libvirt wraps qemu features to expose a programmatic interface into
migration and snapshot creations, but all libvirt is doing is using the
monitor, so you could do the same thing directly on qemu by using the
monitor yourself.

-- 
Eric Blake   eblake@redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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