[one-users] Configure hosts to use qemu without kvm hardware acceleration

Tue Mar 25 05:51:19 PDT 2014

Thank you for the answers,
this was the log file of the vm that don't start because of the missing kvm
module (so it does not fall back to qemu --no-kvm when the kvm module is
not present on the system.

Mon Mar 24 15:11:02 2014 [DiM][I]: New VM state is ACTIVE.
Mon Mar 24 15:11:02 2014 [LCM][I]: New VM state is PROLOG.
Mon Mar 24 15:11:02 2014 [VM][I]: Virtual Machine has no context
Mon Mar 24 15:11:03 2014 [LCM][I]: New VM state is BOOT
Mon Mar 24 15:11:03 2014 [VMM][I]: Generating deployment file:
/var/lib/one/vms/2/deployment.0
Mon Mar 24 15:11:03 2014 [VMM][I]: ExitCode: 0
Mon Mar 24 15:11:03 2014 [VMM][I]: Successfully execute network driver
operation: pre.
Mon Mar 24 15:11:03 2014 [VMM][I]: Command execution fail: cat << EOT |
/var/tmp/one/vmm/kvm/deploy '/var/lib/one//datastores/0/2/deployment.0'
'on-compute1' 2 on-compute1
Mon Mar 24 15:11:03 2014 [VMM][I]: error: Failed to create domain from
/var/lib/one//datastores/0/2/deployment.0
Mon Mar 24 15:11:03 2014 [VMM][I]: error: internal error Child process
(LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
HOME=/ /usr/bin/kvm -no-user-config -device ? -device pci-assign,? -device
virtio-blk-pci,? -device virtio-net-pci,? -device scsi-disk,?) unexpected
exit status 1: Could not access KVM kernel module: No such file or directory
Mon Mar 24 15:11:03 2014 [VMM][I]: failed to initialize KVM: No such file
or directory
Mon Mar 24 15:11:03 2014 [VMM][I]: No accelerator found!
Mon Mar 24 15:11:03 2014 [VMM][I]:
Mon Mar 24 15:11:03 2014 [VMM][E]: Could not create domain from
/var/lib/one//datastores/0/2/deployment.0
Mon Mar 24 15:11:03 2014 [VMM][I]: ExitCode: 255

2014-03-25 13:14 GMT+01:00 Javier Fontan <jfontan at opennebula.org>:

> OpenNebula can be configured to use qemu emulation instead of kvm
> virtualization but not per VM but in the driver definition. The type
> of the VM driver can be changed from "kvm" to "qemu" in oned.conf. For
> example:
>
> --8<------
> VM_MAD = [
>     name       = "kvm",
>     executable = "one_vmm_ssh",
>     arguments  = "-t 15 -r 0 kvm",
>     default    = "vmm_ssh/vmm_ssh_kvm.conf",
>     type       = "qemu" ]
> ------>8--
>
> This is used in the tryout images as they are already virtualized. It
> will be also useful for the infrastructure Marco Fanti wants to
> create.
>
> Still this is not useful to have mixed virtualized and emulated
> machines in the same host. Maybe this parameter can be changed to a VM
> setting instead of a driver setting.
>

Thank you Javier, this solution is actually documented in the oned.conf
comments, I'm sorry that i didn't noticed it before.

>
> On Tue, Mar 25, 2014 at 10:28 AM, Carlo Daffara
> <carlo.daffara at cloudweavers.eu> wrote:
> > It is nevertheless an interesting feature. For example, when emulating
> legacy OSes like DOS or Windows 3.11 you
> > have to disable KVM anyway, or the OS does not boot. (And yes, we *do*
> have sometimes to bring legacy operating systems
> > into OpenNebula :-))
> > Maybe we can add it as a feature? It should be mainly a matter of
> passing the "-no-kvm" switch....
> > cheers,
> > Carlo Daffara
> >
> > ----- Messaggio originale -----
> > Da: "Jon" <three18ti at gmail.com>
> > A: "Marco Fanti" <marco.fanti at studenti.polito.it>
> > Cc: "Users OpenNebula" <users at lists.opennebula.org>
> > Inviato: Martedì, 25 marzo 2014 10:20:50
> > Oggetto: Re: [one-users] Configure hosts to use qemu without kvm
> hardware       acceleration
> >
> >
> >
> > Shouldn't qemu fallback to "paravitualization" when hardware
> acceleration isn't available?
> >
> > http://blog.vmsplice.net/2011/03/should-i-use-qemu-or-kvm.html?m=1
> >
> > I was confident that qemu could detect on the fly if hardware
> virtualization was available and would enable it or not as appropriate.
> until your post...
> >
> > Are you getting an error with OpenNebula?
> >
> > Thanks,
> > Jon A
> > On Mar 25, 2014 1:41 AM, "Marco Fanti" < marco.fanti at studenti.polito.it> wrote:
> >
> >
> >
> > Hi all,
> > I'm building a testing environment and I need to use some kvm virtual
> machines as host nodes.
> > Since I cannot enable the hardware acceleration inside a virtual
> machine*, I'd like to know how to configure a host node like the
> configuration that there is in the kvm sandbox (that actually use qemu-kvm
> with the parameter -no-kvm).
> > As frontend node and host nodes I'm using Debian 7, and opennebula is
> installed from the .deb packages for Debian 7 downloaded from the
> opennebula website.
> >
> > Thank you all,
> > Marco Fanti
> >
> > *I know it is possible to enable nested kvm inside kvm, the guide is
> http://palexster.wordpress.com/2013/03/06/enable-nested-virtualization-on-kvm/,
> > BUT this features has a lot of bug, especially in the "old" versions of
> kvm like the one in Debian Stable, so I'd like a more stable solution, like
> to use qemu without kvm as in the kvm sandbox
> >
> > _______________________________________________
> > Users mailing list
> > Users at lists.opennebula.org
> > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
> >
> >
> > _______________________________________________
> > Users mailing list
> > Users at lists.opennebula.org
> > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
> > _______________________________________________
> > Users mailing list
> > Users at lists.opennebula.org
> > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>
>
>
> --
> Javier Fontán Muiños
> Developer
> OpenNebula - The Open Source Toolkit for Data Center Virtualization
> www.OpenNebula.org | @OpenNebula | github.com/jfontan
>
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