[Cialug] vm on top of xen?

[jim kraai]

You guys are awesome
 On Oct 4, 2013 12:23 PM, "Matt Stanton" <matt at itwannabe.com> wrote:

> Yeah, Linode doesn't expose virtualization instructions to their guests.
>  Interestingly enough, though, DigitalOcean does (vmx).  The problem with
> DigitalOcean is that they do not allow you to choose your bootloader...
> their hypervisor (they use KVM) specifies the kernel image to boot and acts
> as bootloader itself.  You have to choose one of a couple of possible
> options for kernel images given the distro you chose to install, which
> means you don't even get to do your own kernel configurations or security
> updates.  I would imagine that this precludes using xen or kvm inside your
> VPS (though vbox might work?).  You would, of course, have to choose a
> decent VPS with enough virtual cpus to be able to distribute some to your
> nested VMs.
>
> -- Matt (N0BOX)
>
> Sent from my ASUS Transformer
>
> -----Original Message-----
> From: "Daniel A. Ramaley" <daniel.ramaley at drake.edu>
> To: cialug at cialug.org
> Sent: Fri, 04 Oct 2013 11:44 AM
> Subject: Re: [Cialug] vm on top of xen?
>
> I believe what you are asking for is called "nested virtualization".
>
> Generally it is not supported because the base virtualization layer
> (Xen, in your case) does not pass the virtualization extensions to the
> guest. Run this in your guest, and if you get any output then hardware
> virtualization will work, but if not, then it won't:
>     $ egrep 'vmx|svm' /proc/cpuinfo
> Note that that command is Linux-specific; what you are really searching
> for are whether virtualization extensions of the CPU are exposed to the
> guest OS.
>
> If you *really* want to do nested virtualization, it might be possible
> with some restrictions about what guest operating systems you can run.
> To learn more, i recommend search terms like these (i got results from
> Google that seemed applicable):
>     xen without hardware virtualization
>     virtualbox without hardware virtualization
>     xen paravirtualization
>
>
> On 2013-10-04 at 11:24:53 jim kraai wrote:
> > can I run xen on xen or vbox on xen?
> >
> > wanting to fiddle with craziness on a linode vps
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> __
> Daniel A. Ramaley
> Network Engineer 2
>
> Dial Center 112, Drake University
> 2407 Carpenter Ave / Des Moines IA 50311 USA
> Tel: +1 515 271-4540
> Fax: +1 515 271-1938
> E-mail: daniel.ramaley at drake.edu
>
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