On Thu, 2012-03-29 at 19:49 -0700, T.C. Hollingsworth wrote: > On Thu, Mar 29, 2012 at 3:12 PM, Braden McDaniel <braden@xxxxxxxxxxxxx> wrote: > > I've had an rpm upgrade from Fedora 15 tio 16 go slightly sideways and I've > > wound up with a grub prompt upon boot. I found > > <https://fedoraproject.org/wiki/GRUB_2>; alas, it seems to be missing > > information about what one does when one's root partition is on an LVM > > volume. > > By "rpm upgrade" I assume you mean yum upgrade? I do. > Yum upgrades don't > update the bootloader to GRUB2, only anaconda/preupgrade is smart > enough to figure that out, so the only way you'd be running GRUB2 is > if you updated it manually. GRUB1 is *supposed* to still work fine in > the interim, though apparently that didn't work out so well for you. > ;-) The instructions at https://fedoraproject.org/wiki/Upgrading_Fedora_using_yum say to do: /sbin/grub-install BOOTDEVICE But after upgrading the packages, I had no "grub-install"; only "grub2-install". So I did that. Clearly it was insufficient. Now that I look at that page again, I see in the "Fedora 15 -> 16" section, it talks about running "grub2-mkconfig". I missed that part before. Whoops. Your instructions were very helpful. Thank you. For the possible benefit of others, I'll mention a few things… > The prescription for repairing your bootloader from should be > something like this: > > Become root. `sudo` doesn't work on Fedora live media so just: > su - > > Activate your LVM volumes: > vgchange -a y > lvchange -a y > > Mount your root partition somewhere (run `lvdisplay` if you're not > sure of the device path): > mkdir /mnt/root > mount /dev/mapper/vg_hostname-lv_root /mnt/root > > Mount your /boot partition into it (run `print all` in `parted` if > your not sure of the device): > mount /dev/sdX# /mnt/root/boot > > Verify that your boot partition is copacetic. Make sure there's a > kernel and initramfs that has .fc16 in it:. Then, check > /etc/default/grub and make sure that the GRUB_CMDLINE_LINUX variable > mentions your LVM logical volume. There should be a kernel argument > that looks like > "rd.lvm.lv=vg_hostname/lv_root" If there is not, copy the one from > /mnt/root/boot/grub/menu.lst or add one in that format that matches > your configuration. > > Now you can install GRUB2: > grub2-install --boot-directory=/mnt/root/boot You meant to write $ grub2-install --boot-directory=/mnt/root/boot /dev/sdX > Next, chroot into your root paritition. (I think grub2-mkconfig is > smart enough to not need this, but still, it can't hurt.) > chroot /mnt/root FYI, I tried it without chroot'ing and it didn't work. (Which could just mean I did it wrong.) > Generate a grub configuration file. (Remember, you're chrooted now so > /boot is your real boot, not the live media's.) > grub2-mkconfig -o /boot/grub2/grub.cfg This part failed for me until I went back and did $ sudo mount -o bind /dev /mnt/root/dev before chroot'ing. > Finally, make sure it finds the F16 kernel you verified the existence > of earlier, either by looking at what grub2-mkconfig spits out to the > screen or checking grub.cfg. > > With any luck, nothing else will go wrong and you can now reboot into F16. Problem solved. Thanks again. -- Braden McDaniel <braden@xxxxxxxxxxxxx> -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
