libvirt users - Apr 2022 - Guest restarting after issuing a shutdown

Hello everyone,

I create kvm machines using a bash script.  As expected from the
script, the resulting virtual machines are performing as they should
be.  The aspect that I do not get is at the end of the creation, when
issuing a 'shutdown now' in the guest and expecting that it will shut
down.  Instead it does shut down, but it is restarted immediately.

The machines are created using an Arch Linux ISO file.  The bash script
runs in three stages, the first stage is on the host. virt-install
will show the regular Arch Linux installation interface.  The bash
script is copied to the machine and its second stage is ran.  After
that a chroot is done and the third phase of the script is executed.
When everything is configured and installed, here is what happens,
commands are prefixed '%', text output is as is, and comments in
'()' :

guest : % shutdown now
host  :   Domain creation completed.
host  :   Restarting guest.
(virt-manager shows the guest restarting)

host  : % virsh shutdown test02
(nothing happens, guest still shown)

host  : % virsh destroy test02
host  :   Domain test02 destroyed
(guest display closes)

What I'm expecting is that, when the 'shutdown now' is issued in the
guest, that it will effectively terminate the guest, 'virsh list --all'
will not show it running, and there'll be no need to issue a 'virsh
destroy'. I have no clue at the moment why virsh is restarting the
guest after a shutdown was issued in the guest.  Looks like virsh did
not get that it should terminate the guest and considers the shutdown
as an error.

Here are the versions involved :

host : xubuntu 20.04 LTS
libvirt 6.0.0-0ubuntu8.15
virt-manager 1:2.2.1-3ubuntu2.1
guest : archlinux 2022.03.01-x86_64

Thanks !

virt-install is expecting the installation process to need a reboot partway
through, so carefully restarts the guest on its first shutdown. Then it
gets out of the way. Either change what virt-install thinks it's installing
(not sure how, never done it), or write and enable a service during
installation that removes itself then shuts down the guest. First install
doesn't run the service, so restarts normally. Next boot starts the
service, which removes itself and forces a shutdown. Job done.

Cheers,

Peter

On Fri, 1 Apr 2022, 16:14 jonetsu, <jonetsu at teksavvy.com> wrote:
> Hello everyone,
>
> I create kvm machines using a bash script.  As expected from the
> script, the resulting virtual machines are performing as they should
> be.  The aspect that I do not get is at the end of the creation, when
> issuing a 'shutdown now' in the guest and expecting that it will
shut
> down.  Instead it does shut down, but it is restarted immediately.
>
> The machines are created using an Arch Linux ISO file.  The bash script
> runs in three stages, the first stage is on the host. virt-install
> will show the regular Arch Linux installation interface.  The bash
> script is copied to the machine and its second stage is ran.  After
> that a chroot is done and the third phase of the script is executed.
> When everything is configured and installed, here is what happens,
> commands are prefixed '%', text output is as is, and comments in
> '()' :
>
> guest : % shutdown now
> host  :   Domain creation completed.
> host  :   Restarting guest.
> (virt-manager shows the guest restarting)
>
> host  : % virsh shutdown test02
> (nothing happens, guest still shown)
>
> host  : % virsh destroy test02
> host  :   Domain test02 destroyed
> (guest display closes)
>
> What I'm expecting is that, when the 'shutdown now' is issued
in the
> guest, that it will effectively terminate the guest, 'virsh list
--all'
> will not show it running, and there'll be no need to issue a 'virsh
> destroy'. I have no clue at the moment why virsh is restarting the
> guest after a shutdown was issued in the guest.  Looks like virsh did
> not get that it should terminate the guest and considers the shutdown
> as an error.
>
> Here are the versions involved :
>
> host : xubuntu 20.04 LTS
> libvirt 6.0.0-0ubuntu8.15
> virt-manager 1:2.2.1-3ubuntu2.1
> guest : archlinux 2022.03.01-x86_64
>
> Thanks !
>
>
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On Fri, Apr 01, 2022 at 11:12:50AM -0400, jonetsu wrote:
> guest : % shutdown now
> host  :   Domain creation completed.
> host  :   Restarting guest.
> (virt-manager shows the guest restarting)
Try passing --no-reboot to virt-install.
> host  : % virsh shutdown test02
> (nothing happens, guest still shown)
If the guest OS is fully booted up at this point, you should be able
to initiate a clean shutdown from the host.

If that doesn't work, make sure your VM configuration contains

  <domain>
    ...
    <features>
      <acpi/>
    </features>
    ...
    <on_poweroff>destroy</on_poweroff>
    ...
  </domain>

and that there is some software running in the guest that will
process the ACPI event appropriately. systemd will usually take care
of that part.

-- 
Andrea Bolognani / Red Hat / Virtualization