Re: [PATCH] [Xen-users] Problems with pygrub: ValueError:unabletoopen file

["Michael Paesold" <mpaesold@xxxxxx>]

Henning Sprang wrote:

> Michael Paesold wrote:
> > Sorry for the last empty mail (hit the wrong button). Attached is a patch 
> > against xen-unstable to improve the error messages in pygrub when the 
> > e2fsprogs do not support the newer ext2fs_open2 function. This should 
> > help beginners to identify the real problem when pygrub does not work 
> > (e.g. on RHEL4).
> I also have that problem on fedora core 5. As far as I can see, your fix 
> is only about the error message. But how can the actual problem be solved?
> I'd really like to use a simple xen config as given in xmexample1, and use 
> the images from xen-get.org.
> My post to fedora-xen can be found at: 
> https://www.redhat.com/archives/fedora-xen/2006-April/msg00085.html
At the time of my first reply, I didn't see that you replied to your own 
post. So here is a more appropriate answer.
Your first issue is that you are not able to load a domU kernel that is 
located in dom0, right? In that case make sure that the file is really there 
(ls -l /boot/vmlinuz-2.6.16-1.2080_FC5xenU) and is accessible by xend. 
SELinux might block access to /boot from Xen. You should try to disable 
SELinux to check if that is true. If you do not want to disable SELinux, you 
might also cp vmlinuz and the corresponding initrd (.img) to a place that is 
accessible for xend (e.g. on FC5 this should be /var/lib/xen for instance).
The second issue is that pygrub does not work. Since FC5 has recent 
e2fsprogs, your issue should be different than the one my patch addressed. 
The message "ValueError: unable to open file" could have several reasons:
- kernel and initrd were not properly installed in the *guest* filesystem
- no valid grub configuration /boot/grub/grub.conf exists in the guest 
filesystem
- the filesystem image file was no created properly and pygrub fails to open 
the filesystem (with my patch applied, this would read "unable to open 
filesystem")
I hope that helps.

Best Regards,
Michael Paesold 

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