On 05/22/2015 06:31 PM, ToddAndMargo wrote:
> On 05/22/2015 05:15 PM, Konstantin Olchanski wrote:
>> On Fri, May 22, 2015 at 01:43:08PM -0700, ToddAndMargo wrote:
>>>
>>> After installing the above, the boot order came up with the
>>> two rescue modes on top. Would you please correct this?
>>>
>>
>> This is a feature of grub2. In grub1, the order was specified manually
>> in grub.conf. In grub2, the order is magically created by a mess of bash
>> scripts. When installing a new kernel, it magically runs
>> some magic commands to make itself the default kernel to boot. None of
>> this
>> is documented anywhere.
>>
>> If you want sane booting, switch to syslinux.
>>
>
> Hi Konstantin,
>
> I have been working on a direct install Xfce Fedora 21 flash
> drive. I had to tweak the /boot/grub2/grub.cfg to get it
> to boot off of all machine. (Which it does, unlike Live
> USB -- faster too).
>
> In FC21's Grub.cfg, the "menuentry" are all appear in order
> on the boot screen. And, the "rescue" appears at the bottom.
>
> Is the problem I noticed, a EL7 issue? I logged into the
> SL7 hard drive (that won't boot) with my Live CD and took
> a peek at grub.cfg, and that is the way they were written.
>
> And YIKES! A Boo-boo in grub.cfg. Look at this:
>
> menuentry 'Scientific Linux 7.1 Rescue 95621d90ac5d4ae8a262fd52ed537a16
> (3.10.0-229.1.2.el7.x86_64)' --class fedora --class gnu-linux --class
> gnu --class os --unrestricted $menuentry_id_option
> 'gnulinux-3.10.0-229.1.2.el7.x86_64-advanced-562d91f4-7086-451e-abc1-870f59bf3c41'
> {
> ....systemd.debug
> }
>
> initrd16 /initramfs-0-rescue-95621d90ac5d4ae8a262fd52ed537a16.img
> ^^^^^^^^stray line that should have been above the "}" bracket ^^^^^^^
>
> menuentry 'Scientific Linux 7.1 Rescue 95621d90ac5d4ae8a262fd52ed537a16
> (3.10.0-229.1.2.el7.x86_64) with debugging' --class fedora --class
> gnu-linux --class gnu --class os --unrestricted $menuentry_id_option
> 'gnulinux-3.10.0-229.1.2.el7.x86_64-advanced-562d91f4-7086-451e-abc1-870f59bf3c41'
> {
> load_video
> ...
>
>
> This happened on the top two, but on the bottom third one.
> Correcting that those two boo-boos made it so the "rescue"
> sections could boot. But the main section (Nitrogen) give
> a kernel panic:
>
> Failed to access perfctr msr (MSR c1 is 0)
> kernel panic -- not syncing:L VFS: Unable to mount root fs on
> unknown-block(0,0)
>
> I documented it over on:
> https://bugzilla.redhat.com/show_bug.cgi?id=1224434
>
> -T
>
Additional info:
If I comment out the "linux16" entry from the Nitrogen menuentry, the
kernel panic goes away and I can boot normally.
Also, putting the ending bracked ("}") in the right place on the two
duplicate rescue menuentries also enables it to boot.
--
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Computers are like air conditioners.
They malfunction when you open windows
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