Differences between standard and rescue kernels

[Ahmad Samir]

On 19 May 2015 at 19:52, Alex Regan <mysqlstudent at gmail.com> wrote:

> Hi,
>
> On 05/17/2015 11:31 PM, Alex Regan wrote:
>
>> Hi,
>>
>> I installed fedora21 on an AMD x86_64 box then moved it to an Intel
>> x86_64 box and it would no longer boot. It would get to the following:
>>
>> Switched to clocksource tsc
>>
>> then just sit there. Booting from the rescue kernel worked properly.
>>
>> What is the difference between the standard default kernel and the
>> rescue kernel?
>>
>> # grep ^menuentry /etc/grub2.cfg
>> menuentry 'Fedora, with Linux 3.19.7-200.fc21.x86_64' --class fedora
>> --class gnu-linux --class gnu --class os --unrestricted
>> ..
>> menuentry 'Fedora, with Linux 0-rescue-1b5a0c2dfaca499c98f601585417d143'
>> --class fedora --class gnu-linux --class gnu --class os --unrestricted
>> $menuentry_id_option
>>
>> 'gnulinux-0-rescue-1b5a0c2dfaca499c98f601585417d143-advanced-a76c8f65-ff02-470b-b087-453fc8b6275e'
>>
>>
>> Also, what is this new initrd16 and linux16 grub2 options?
>>
>> Do I need to rebuild the initrd to support the AMD processor on the new
>> machine? I believe I use dracut for that?
>>
>
> Rebuilding the initramfs image with dracut resolved this. I never expected
> the boot image to be missing enough actual processor support to prevent
> booting.
>
> # cd /boot
> # dracut -f /boot/initramfs-$(uname -r).img $(uname -r)
>
>
FWIW just "dracut -f" would have done the same.

-- 
Ahmad Samir
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