How to restore MBR on a separate /boot partition?

[Dan Thurman]

On 04/08/2013 02:47 PM, Dan Thurman wrote:
> On 04/08/2013 09:06 AM, Dan Thurman wrote:
>> Since I was unable to install F18, I would like
>> to revert back to F17 that I have restored from
>> backups, the following partitions:
>>
>> / (root)   /dev/sda10
>> /boot      /dev/sda9
>>
>> What I have left to do is to restore the MBR
>> on /dev/sda9 /boot partition.
>>
>> I have a separate MBR installed on /dev/sda
>> drive which is the master MBR for multiboot
>> OS, which is working fine.
>>
>> What steps can I use to accomplish this?
>>
> Are these the instructions I am looking for?
>
>    1. Boot the system from an installation boot medium. (live CD/DVD/USB)
>    2. Type linux rescue at the installation boot prompt to
>       enter the rescue environment.
>    3. mkdir /mnt/sysimage
>    4. mount /dev/sda10 /mnt/sysimage
>    5. mount /dev/sda9 /mnt/sysimage/boot
>    6. mount --bind /dev /mnt/sysimage/dev
>    7. mount --bind /proc /mnt/sysimage/proc
>    8. mount --bind /sys /mnt/sysimage/sys
>    9. chroot /mnt/sysimage              # root partition.
>   10. grub2-install /dev/sda9           # boot partition.
>   11. grub2-mkconfig -o /boot/grub2/grub.cfg
>   12. Review the /etc/grub.d/10_linux
>   13. Reboot the system.
Addendum:
1. Step 10: Add --force argument
2. Step 11: Will update grub.cfg, so save the original for comparison,
if desired.

Since I used rsync to restore from backups, touch .autorelabel in /
and then reboot. Ignore the complaints due to SELinux permissions
SELinux will reset the permissions and will reboot.

Fedora 17 boots successfully for me.