grub2

[Patrick Dupre]

Hello,

After the installation of a new kernel (typically during an update).
There is a change of the file /boot/grub2/grub.cfg.

However, the new menuentry created is not correct.
The new one includes
 linux   /vmlinuz-3.14.2-200.fc20.x86_64 root=/dev/mapper/VolGrpSys_DK1-root
which wrong.
I can change it manually.

I cannot guess where the information is found!
the 
set root='lvm/VolGrpSys_DK1-root'

is correct

It does not seem to be in
/etc/grub.d/

It looks like that it takes it from another distribution installed on the
machine, while any of the partition are mounted!

Thank for your help.

===========================================================================
 Patrick DUPRÉ                                 | | email: [e-mail]
 Laboratoire de Physico-Chimie de l'Atmosphère | |
 Université du Littoral-Côte d'Opale           | |
 Tel.  (33)-(0)3 28 23 76 12                   | | Fax: [phone]
 189A, avenue Maurice Schumann                 | | 59140 Dunkerque, France
===========================================================================

[Chris Murphy]

On May 4, 2014, at 4:33 PM, Patrick Dupre  wrote:
> Hello,
>
> After the installation of a new kernel (typically during an update).
> There is a change of the file /boot/grub2/grub.cfg.
>
> However, the new menuentry created is not correct.
> The new one includes
> linux   /vmlinuz-3.14.2-200.fc20.x86_64 root=/dev/mapper/VolGrpSys_DK1-root
> which wrong.
> I can change it manually.
>
> I cannot guess where the information is found!
> the 
> set root='lvm/VolGrpSys_DK1-root'
>
> is correct

The first one looks correct, the second one doesn't. Can you either post the entire grub.cfg, or you can also edit an older entry and check what root= it uses. For any rootfs on LVM, I expect root=/dev/mapper/VG-LV. When updating the kernel, it calls grubby, which should just create a new entry based on a previous entry only updating the name of the kernel and initramfs accordingly. I haven't seen it change the root entry.

The other thing you can do is create a new grub.cfg from scratch by using

grub2-mkconfig -o /boot/grub2/grub.cfg

This is the same command the installer used when Fedora was installed.

Chris Murphy