Facter does not recognise Xen HVM DomU - Puppet Users

The old Google Groups will be going away soon, but your browser is incompatible with the new version.
Message from discussion Facter does not recognise Xen HVM DomU
Received-SPF: neutral (google.com: 95.130.10.63 is neither permitted nor denied by domain of jean.baptiste.fa...@gmail.com) client-ip=95.130.10.63;
Message-ID: <4C61A085.4050104@gmail.com>
Date: Tue, 10 Aug 2010 20:55:01 +0200
From: Jean Baptiste FAVRE <jean.baptiste.fa...@gmail.com>
Reply-To: jean.baptiste.fa...@gmail.com
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.11) Gecko/20100713 Lightning/1.0b1 Thunderbird/3.0.6
MIME-Version: 1.0
To: puppet-users@googlegroups.com
Subject: Re: [Puppet Users] Facter does not recognise Xen HVM DomU
References: <4C5D5594.9090400@gmail.com> <1281462679-sup-6969@reinh.local>
In-Reply-To: <1281462679-sup-6969@reinh.local>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

Hello Rein,
Strange, my mail took 3 days to be delivered :-/

By the way, I just had a look on the tickets you mentionned.

As far as I can see, they are not duplicates with mine: it's definitelyt
more dom0 detection failure related, not only domU.
In my case, dom0 is perfectly detected. I can't say for PV domU as I
don't use them but reading virtual.rb code, I guess they'll.

My problem is that xen domU detection is currently based on some /proc
or /sys files presence:
- /proc/sys/xen/independent_wallclock
- /sys/bus/xen

These pseudo files appear only in PV domU as they're kernel related. HVM
DomU does not know they're running in a virtualized environment.
Therefore, their kernel does not expose these pseudo-files.

I made few other modifications to virtual.rb so that I can use other
ways to detect xen HVM DomU (lspci, dmidecode) as it's done for other
virtualisation systems (all based on this page:
http://www.dmo.ca/blog/detecting-virtualization-on-linux/). Please
review my patch below (thanks to be indulgent, it's my first patch more
or less ;-) )

Regards,
JB



# diff virtual.rb.xen virtual.rb
44d43
<                     result = "xenhvm" if p =~ /XenSource/
51d49
<                         result = "xenhvm" if pd =~ /HVM domU/
77c75
<         when "xenu", "openvzve", "vmware", "xenhvm"
---
>         when "xenu", "openvzve", "vmware"



On 10/08/2010 19:58, Rein Henrichs wrote:
> Excerpts from Jean Baptiste FAVRE's message of Sat Aug 07 05:46:12 -0700 2010:
>> Hello everyone,
>>
>> While discovering puppet, I just figured out that facter does not
>> recognise my server as Xen HVM DomU, at least not in virtual fact:
>>
>> [ snip ]
>>
>> A quick look into virtual.rb, and a dirty hack later, I can see my HVM
>> domU as what they are. Now I wonder to know if I use the right fact ?
> 
> Hi Jean,
> 
> Thanks for reporting this. I've added a ticket [1] to our issue tracker
> so we can follow up on this issue more easily. Your issue seems to be
> related to (or possibly a duplicate of) some existing tickets. I've
> listed them as related in the ticket itself. Would you mind taking a
> look at those to see if your issue is a duplicate? If so, we can assign
> it as such.
> 
> Thanks!
> 
> [1] http://projects.reductivelabs.com/issues/4508
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
Account Options
