libvirt users - Apr 2020 - Re: [Query] Facing issue in build libvirt6.0 on ubuntu 1804

Hi Michal,

Please find the details below,
rst2html5 1.10.6 (Docutils 0.16 [release], Python 3.6.9, on linux)


is there any other way to access/control the guest os running on top QEMU ?

Thanks,
Ramesh

On Thu, Apr 30, 2020 at 3:47 PM Michal Privoznik <mprivozn@redhat.com>
wrote:
> [Please keep the list CCed]
>
> On 4/30/20 12:02 PM, Ramesh B wrote:
> > Hi Michal,
> >
> > Thanks for quick response.
> >
> > Ubuntu: 18.04.3 LTS
> > QEMU emulator version 4.2.0
> > libvirtd (libvirt) 4.0.0
> >
> > I have lunched the guest os using QEMU.
> > I would like to use the virsh commands to get the status / control of
> > guest OS.
> > when i run any virsh commands not getting any response from QEMU.
> > When i tried to explore, found the solution saying use of QEMU monitor
> > will help.
> > added the below command while lunch,
> > -chardev
> >
>
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-freebsd11.0/monitor.sock,server,nowait
>
> > -mon chardev=charmonitor,id=monitor,mode=control
> >
> > but result in below mentioed error:
> > Failed to bind socket to
> > /var/lib/libvirt/qemu/domain-freebsd11.0/monitor.sock
> >
> > Then thought of building libvirt 6.0 version, will help to solve the
> > problem.
>
> Ah, so you wanted to use 'virsh qemu-attach' to attach libvirt to a
> running qemu. Yeah, it needs a monitor. However, the functionality was
> not maintained and probably not functional anyway so we've removed in
> the 5.5.0 release.
>
> >
> > Please guide me to solve this problem.
> >
> > Regards,
> > Babu B
> >
>
>
> But what's interesting is that you are unable to build. Which package
is
> providing the rst2* binaries? Are their up to date?
>
> Michal
>
>

On 4/30/20 12:53 PM, Ramesh B wrote:
> Hi Michal,
> 
> Please find the details below,
> rst2html5 1.10.6 (Docutils 0.16 [release], Python 3.6.9, on linux)
> 
Weird. I have slightly older version and it works for me. Maybe 
configure is picking something else, some weird binary/python script?
> 
> is there any other way to access/control the guest os running on top QEMU ?

Ideally, you would construct the domain XML to match the command line 
and then use 'virsh define' to store the XML in libvirt. From that point
on, libvirt will know about the domain and you can use all libvirt APIs 
to control it.
Unless your cmd line is super complicated then usually virt-install 
--import in combination with --print-xml allows you to converge into the 
current config.

Michal

Hi Michel,

Thanks for quick update.

  Weird. I have slightly older version and it works for me. Maybe
configure is picking something else, some weird binary/python script?

   * =>* I have python 3.6 version, is it required latest version e.g
Python 3.8 ?


 Ideally, you would construct the domain XML to match the command line
and then use 'virsh define' to store the XML in libvirt. From that point
on, libvirt will know about the domain and you can use all libvirt APIs
to control it.

   * =>*   could you please share sample xml & commands for reference to
try above procedure.
           Few Qemu parameters are as follows,
          -m 2048 -smp 2 -M q35
          -enable-kvm
          --cpu host

Regards,
Babu B
On Thu, Apr 30, 2020 at 4:33 PM Michal Privoznik <mprivozn@redhat.com>
wrote:
> On 4/30/20 12:53 PM, Ramesh B wrote:
> > Hi Michal,
> >
> > Please find the details below,
> > rst2html5 1.10.6 (Docutils 0.16 [release], Python 3.6.9, on linux)
> >
>
> Weird. I have slightly older version and it works for me. Maybe
> configure is picking something else, some weird binary/python script?
>
> >
> > is there any other way to access/control the guest os running on top
> QEMU ?
>
>
> Ideally, you would construct the domain XML to match the command line
> and then use 'virsh define' to store the XML in libvirt. From that
point
> on, libvirt will know about the domain and you can use all libvirt APIs
> to control it.
> Unless your cmd line is super complicated then usually virt-install
> --import in combination with --print-xml allows you to converge into the
> current config.
>
> Michal
>
>