[CentOS] Is it possible to lvrename the current root partition?

Ross S. W. Walker rwalker at medallion.com
Fri May 2 21:28:30 UTC 2008


Ross S. W. Walker wrote:
> 
> Alfred von Campe wrote:
> > 
> > I'd like to rename my existing volume groups and logical volumes (I  
> > picked names a long time ago I no longer like :-).  I recently  
> > stumbled across the lvrename and vgrename commands, but when I tried  
> > the former to rename the logical volume that my root partition  
> > resides on, the system became unbootable.
> > 
> > In addition to renaming the LV (and VG if I decide to to that as  
> > well), what else needs to be changed?  So far my list includes:
> > 
> >    o /etc/fstabb
> >    o /boot/grub/grub.conf
> >    o /dev/<vgname>/<lvnamex>
> >    o /dev/mapper/<vgname-lvnamex>
> > 
> > I was hoping the lvrename and/or vgrename would take care of these  
> > details.  Are there any scripts out there that take care of all the  
> > details?  If not, I may write one (once I have the recipe to get this  
> > working, of course).
> 
> Sure you can do all this from rescue mode off the first CD.
> 
> Boot the cd type in 'linux rescue' and continue to the command prompt.
> 
> At the command prompt:
> 
> 1) make sure swap isn't using the swap lv
> 	- swapoff -a
> 
> 2) unmount all lvs mounted
> 	- umount /mnt/sysimage/boot
> 	- umount /mnt/sysimage
> 
> 3) mark all lvs as unavailable
> 	- lvchange -a n <vgname>
> 
> 4) rename the volume group
> 	- vgrename <oldvgname> <newvgname>
> 
> 5) rename the logical volumes
> 	- lvrename <vgname>\<oldlvname> <newlvname>
> 
> 6) repeat #5 as necessary
> 
> 7) re-activate all the lvs
> 	- lvchange -a y <vgname>
> 
> 8) re-mount the root and boot lvs,
> 	- mount /dev/<vgname>/<rootlv> /mnt/sysimage
> 	- mount /dev/<vgname>/<bootlv> /mnt/sysimage/boot
> 
> 9) chroot to the mounts with, 'chroot /mnt/sysimage /bin/bash'
> 
> 10) edit /etc/fstab
> 
> 11) edit /boot/grub/grub.conf
> 
> That should do it.

Oh, I forgot, as Bill pointed out...

12) remake the initrd
	- mkinitrd -f /boot/initrd-$(uname -r).img $(uname -r)

Does uname work correctly chroot'd? I'll have to test that out...

-Ross

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