[Cialug] vm on top of xen?

[Theron Conrey]

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
>>  > _______________________________________________
>>  > Cialug mailing list
>>  > Cialug at cialug.org
>>  > 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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>> 
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