[Cialug] vm on top of xen?

[jim kraai]

i forgot to say, "thank you" for the great answers

Thank you!

Seriously.

--jim



On Fri, Oct 4, 2013 at 2:47 PM, Theron Conrey <theron at conrey.org> wrote:

> These days I try and steer folks towards containers on VMs rather than
> nested.  Unless you actually need full VM isolation for something crazy,
> container level isolation has less load, and doesn't cost as much in terms
> of performance.
>
> Plus.. it's cool.
>
> -theron
>
>
> On Fri, Oct 4, 2013 at 11:35 AM, jim kraai <jimgkraai at gmail.com> wrote:
>
>> 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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>>>  > http://cialug.org/mailman/listinfo/cialug
>>>  __
>>>  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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