[virt-tools-list] guestfish question

Kenneth Armstrong digimars at gmail.com
Thu Nov 4 19:21:41 UTC 2010

Yes, sorry, they are part of the same install.  I'll try the below
command by adding both disks.  Thanks again.


On Thu, Nov 4, 2010 at 3:12 PM, Richard W.M. Jones <rjones at redhat.com> wrote:
> On Thu, Nov 04, 2010 at 11:55:28AM -0400, Kenneth Armstrong wrote:
>> However, I exported another RHEL guest that has 2 disks for it.  One
>> is /dev/VolGroup00-LogVol00 which holds my / partition, and the other
>> is /dev/VolGroup01-LogVol00 which holds my /var partition.
>> When I run the following command on one of the disks, I get the
>> following output (the GUID is the garbage that RHEV spits out, I've
>> got a script that cleans that up):
>> guestfish -a b1c98582-d325-42e5-9d03-f798571d35fa -i inspect-os
>> libguestfs: error: mount_options: mount_options_stub:
>> /dev/VolGroup01/LogVol00: No such file or directory
>> guestfish -a 82c85a78-04c2-4918-99dc-86129bd2da39 -i inspect-os
>> guestfish: no operating system was found on this disk
>> Now the first one, I can kind of understand since it's only supposed
>> to be my /var partition, and no other operating system files are on
>> there, so I get that there is no operating system information in the
>> output.  But on the other disk image, which is my root partition, it
>> doesn't find the OS.  Any thoughts as to why?  It only does this on my
>> multiple disk VM's.
> So I guessed (you didn't say precisely) that these two disks belong to
> the same operating system?
> It seems as if b1c9... contains VolGroup00 and hence the root
> partition.  libguestfs finds this, looks at /etc/fstab, and expects to
> be able to mount VolGroup01/LogVol00 (which will be mentioned in
> /etc/fstab), but since you didn't supply this disk to guestfish, it is
> not able to do the mount and fails.
> It seems as if 82c8... contains the VolGroup01.  This is just the /var
> partition, so there is no operating system.
> Basically, if a guest has two disks, you have to supply both of them
> if you want to use the guestfish -i option.  Try:
>  guestfish -a b1c9... -a 82c8... -i inspect-os
> Alternately you could _not_ use the -i option, and do the inspection
> manually, with or without the help of the inspection APIs:
>  http://libguestfs.org/guestfs.3.html#inspection
> This is a bit tricky to do from guestfish, but if you use the
> underlying API from another language like Perl/Python/whatever then as
> they say anything is possible ...
> Rich.
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
> virt-df lists disk usage of guests without needing to install any
> software inside the virtual machine.  Supports Linux and Windows.
> http://et.redhat.com/~rjones/virt-df/

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