At Sun, 12 Sep 2010 22:40:52 -0600 CentOS mailing list centos@centos.org wrote:
On Sat, Sep 11, 2010 at 2:55 PM, Robert Heller heller@deepsoft.com wrote:
At Sat, 11 Sep 2010 13:45:55 -0600 CentOS mailing list centos@centos.org wrote: Note: in the case of mkinitrd, you will need to rebuild your initrd if you expect to actually boot the machine after renaming the volume group and logical volumes. You'll need to *manually* mount the root and /boot (at least) someplace (eg under /sysroot), then chroot there. Don't forget to fix /etc/fstab and /boot/grub/grub.conf (root=...).
Googling got me the command: /sbin/mkinitrd -f /boot/initrd-$(uname -r).img $(uname -r)
Unfortunately this resulted in:
error opening /sys/block: No such file or directory error opening /sys/block: No such file or directory
The renamed root lvm filesystem is mounted on /mnt/root the /boot is in /dev/sda1 and mounted on /mnt/root/boot
before doing the chroot, I tried
sudo cp -a /sys/block /mnt/root/sys
Wrong!
Do this: mount --bind /sys /mnt/root/sys mount --bind /dev /mnt/root/dev mount --bind /proc /mnt/root/proc chroot /mnt/root /sbin/mkinitrd -f /boot/initrd-<actual KV>.img <actual KV> exit umount /mnt/root/sys umount /mnt/root/dev umount /mnt/root/proc
Note: you don't want to use 'uname -r' while running the LiveCD, since the it might not be the kernel your system wants to boot (in fact it wasn't as you discovered). Look in /boot/grub/grub.conf and see *exactly* which kernel your system is booting. Replace <actual KV> with whatever you find in /boot/grub/grub.conf -- this will rebuild the *correct* initrd. Yes, more *careful* typing, but that is what you need to do.
Even though it was done with root privilege I got a lot of read permission errors, but a lot stuff did copy, maybe I got what I need. did the mkinitrd, no errors
Lets try booting from the hard drive.
Hmm there's a splash screen, that's a good sign.
No Joy. It's not booting and complaining about not finding stuff with the old names.
Did I screw up the grub.conf edits. Just checked they are ok.
It finds the volume groups with the new names then complains about the old names:
Volume group "VolGroup00" not found Unable to access resume device (/dev/VolGroup00/LogVol01)
Hmm. That's the old name of the swap device.
There's at least one more piece of the puzzle that's missing.
Lets boot up the Live CD again. And take a closer look at fstab. Looks good to me.