After renaming LVM volume group, receiving "/usr/sbin/grub2-probe: error: failed to get canonical path"

Environment

• Red Hat Enterprise Linux 8
• Red Hat Enterprise Linux 9

Issue

• After renaming LVM volume group, receiving "/usr/sbin/grub2-probe: error: failed to get canonical path".

/usr/sbin/grub2-probe: error: failed to get canonical path of ‘/dev/mapper/  rhelnew1-root’.

Resolution

Rescue Mode Workaround

• Boot the system to rescue mode and rebuild grub2 using following command:

  • BIOS-based machines:

            # chroot /mnt/sysimage
            # grub2-mkconfig -o /boot/grub2/grub.cfg
    

  • UEFI-based machines:

            # chroot /mnt/sysimage
            # grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
    

Refer to How to generate sosreport from the rescue environment for details.
The above workaround assumes /etc/fstab has already been set correctly and /etc/default/grub has been updated as well

Grubby Workaround

• After renaming the volume group, update fstab:

# vgrename rhel new_rhel
# sed -i 's/rhel/new_rhel/g' /etc/fstab

• Update the boot parameter:

# grub2-editenv - list | grep kernelopts
kernelopts=root=/dev/mapper/rhel-root ro crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet

# grub2-editenv - set "kernelopts=root=/dev/mapper/new_rhel-root ro crashkernel=auto resume=/dev/mapper/new_rhel-swap rd.lvm.lv=new_rhel/root rd.lvm.lv=new_rhel/swap rhgb quiet"

• Update the kernel arguments:

#  grubby --info DEFAULT
index=0
kernel="/boot/vmlinuz-4.18.0-240.el8.x86_64"
args="ro crashkernel=auto resume=/dev/mapper/new_rhel-swap rd.lvm.lv=new_rhel/root rd.lvm.lv=new_rhel/swap rhgb quiet $tuned_params"
root="/dev/mapper/new_rhel-root"
initrd="/boot/initramfs-4.18.0-240.el8.x86_64.img $tuned_initrd"
title="Red Hat Enterprise Linux (4.18.0-240.el8.x86_64) 8.3 (Ootpa)"
id="c2bbf943f69c4d8eb352b4f66e3d84ae-4.18.0-240.el8.x86_64"

#  grubby --args "ro crashkernel=auto resume=/dev/mapper/new_rhel-swap rd.lvm.lv=new_rhel/root rd.lvm.lv=new_rhel/swap rhgb quiet $tuned_params" root="/dev/mapper/new_rhel-root" --update-kernel ALL

#  grubby --info DEFAULT
index=0
kernel="/boot/vmlinuz-4.18.0-240.el8.x86_64"
args="ro crashkernel=auto resume=/dev/mapper/new_rhel-swap rd.lvm.lv=new_rhel/root rd.lvm.lv=new_rhel/swap rhgb quiet $tuned_params"
root="/dev/mapper/new_rhel-root"
initrd="/boot/initramfs-4.18.0-240.el8.x86_64.img $tuned_initrd"
title="Red Hat Enterprise Linux (4.18.0-240.el8.x86_64) 8.3 (Ootpa)"
id="c2bbf943f69c4d8eb352b4f66e3d84ae-4.18.0-240.el8.x86_64"

• Then reboot the system.

# reboot

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