[libvirt-users] Starting processes inside VMs using Libvirt?

[Taimur Al Said]

Thank you Eric,

I am using KVM: qemu.. I'll try to see how I can use qemu-guest-agent..
If you have links to examples on how to start with it let me know please.
Consider the following simple scenario..

I am using KVM to run several VMs; one of OSs in the guests is Windows XP.
I want to send to it something from the Hypervisor level, e,g
text,parameters,etc
so that it will be displayed in the VM screen or stored in a file so I can
read from the VM later..
It's best to be done on a live VM.

How can such a simple scenario be performed. Does it have to be through the
method of qemu-guest-agent??

Thanks alot,



T.alsaid







On Mon, Mar 24, 2014 at 5:17 PM, Eric Blake <eblake at redhat.com> wrote:

> On 03/24/2014 10:36 AM, Taimur Al Said wrote:
> > Hi there,
> >
> > I am a beginner with Libvirt. I was practicing using Python bindings with
> > libvirt to do some basic stuff like starting a VM, rebooting a VM,
> > displaying the number of domain,etc. I was wondering since the hypervisor
> > has control over the VMs, it is possible to use Libvirt to inject code
> into
> > the VM? Is it possible to start processes inside a particular VM using
> the
> > Libvirt API. If not, what would you recommend instead? Thanks in advance
>
> What hypervisor are you using?  With lxc:// URI, this is already
> possible (see virsh lxc-enter-namespace).  With qemu:// URI, this isn't
> really libvirt's thing to do directly; but you might be able to enhance
> the qemu-guest-agent to run an arbitrary command, then install that
> agent in your guest, then use libvirt's 'virsh qemu-agent-command' to
> drive that new agent command.
>
> If the changes you want in your guest can be done while the guest is
> offline, then libguestfs is a great suite of tools for making all sorts
> of guest disk image modifications (which is as programmatic as you can
> get for injecting behavior changes into your guest).  But actually
> injecting live processes into a running qemu guest is not possible
> without setting up some sort of higher-level protocol, such as
> qemu-guest-agent.
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
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