LV mount

LV mount

[Joseph A. Perrin]

Greetings;

The concept of mounting a LV "file", as created by xenguest-install.py is very 
appealing.  I've seen that topic here and there, but no practical advice on 
how to do it.

I'd like to create some standard system images, move them into position, tweak 
some files therein, and then create a host.  The tweaking step is the big problem.

For clarity my config files have an entry like this:

	disk = [ 'file:/xenimages/g1.root,xvda,w', ...


Is is possible to mount a LV "file", (i.e. /xenimages/g1.root), much like one 
would mount a file system using the loop option?  (and *No*, I don't want to 
try to do this while my vMachine is running!)  Then the Xen host machine can 
set little things like hostname, additional volumes to mount, etc. to get it 
on it's merry way!

Any direction would be helpful!  :-)

-jap

-- 
Joseph A. Perrin  President of Discovery Networks, Inc.  Voice: 616.977.1700
jap@dnx.net       http://dnx.net                           Fax: 616.977.1702

Re: LV mount

[Stephen C. Tweedie]

Hi,

On Wed, 2006-06-07 at 13:53 -0400, Joseph A. Perrin wrote:

> Is is possible to mount a LV "file", (i.e. /xenimages/g1.root), much like one 
> would mount a file system using the loop option?  (and *No*, I don't want to 
> try to do this while my vMachine is running!)

Yes, it is; there is a little-known tool called "kpartx" which lets you
do it.  I wrote this up for the FC5 xen wiki page: see topic "Accessing
data on a guest disk image" at

http://fedoraproject.org/wiki/FedoraXenQuickstartFC5

It's *very* useful for accessing partitions and LVM PVs/LVs from inside
Xen guest images.

--Stephen