Il 05 Mag 2017 19:30, "Nikolaos Milas" <nmilas@xxxxxx> ha scritto:
On 5/5/2017 3:45 μμ, Gianluca Cecchi wrote:
BTW: see also this paragraph in the provided RH EL link:
> 24.7.3. Resetting and Reinstalling GRUB 2
>
> But i think is not your problem....
>
Yes, I have done that, without change in behavior.
Also, after changing partitions flag does your fdisk command reflect the
> change?
>
Yes.
Is the error during boot the same as the one provided in your first e-mail?
>
Yes.
One final thing. When I had to change boot settings, I made different steps
> in choot environment in respect of the indication inside the image you
> sent.
>
> Specifically
>
> Verify if your boot partition is already mounted under /mnt/sysimage/boot
> in your current environment
>
Yes, it is:
sh-4.2# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/live-rw 2.0G 1.1G 930M 54% /
devtmpfs 979M 0 979M 0% /dev
tmpfs 1001M 4.0K 1001M 1% /dev/shm
tmpfs 1001M 8.3M 993M 1% /run
tmpfs 1001M 0 1001M 0% /sys/fs/cgroup
/dev/sr0 680M 680M 0 100% /run/install/repo
tmpfs 1001M 300K 1001M 1% /tmp
/dev/mapper/centos-root 18G 1.5G 16G 9% /mnt/sysimage
/dev/vdal 497M 192M 306M 39% /mnt/sysimage/boot
/tmpfs 1001M 0 1001M 0% /mnt/sysimage/dev/shm
If it is mounted on another mount point in your live env go and umount it
> and run
> mount /dev/vda1 /mnt/sysimage/boot
>
Didn't need to.
then
> chroot /mnt/sysimage
>
OK, I did so:
sh-4.2# chroot /mnt/sysimage
bash-4.2#
when you are in chrooted environment, probably you don't have special files
> for vda and vda1 because they are dinamically created;
> verify with
>
> ls -l /dev/vda*
>
It seems I do have such files:
bash-4.2# ls -la /dev/vda*
brw-rw----. 1 root disk 252, 0 May 5 16:49 vda
brw-rw----. 1 root disk 252, 1 May 5 16:49 vdal
brw-rw----. 1 root disk 252, 2 May 5 16:49 vda2
If this is the case, go and create them
>
> mknod -m 660 /dev/vda b 253 0
> mknod -m 660 /dev/vda1 b 253 1
>
Didn't need to.
at this point
>
> grub2-install /dev/vda
> and let see the output of the command and its exit code
>
As usual:
bash-4.2# grub2-install /dev/vda
Installing for i386-pc platform.
grub2-install: error: unknown filesystem.
at this point exit chrooted environment (exit)
> umount /mnt/sysimage/boot
>
> reboot and see if anything changes
>
Didn't do it, because grub2-install above failed, so nothing changed.
I am very puzzled with "unknown filesystem".
Thanks for your time and help! I am looking forward to reaching a solution!
All the best,
Nick
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Your /mnt/sysimage/boot is under tmpfs not real disk...
Try to unmount it and mount the vda1 device instead and then follow the
other steps...
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