Yes, that was it!
The VM booted fine after /etc/fstab update!
Case closed. It was a tricky one!
Thank you all for your feedback and kind assistance!
I did another test, which was also successful.
Below follows the output from the process (after booting in troubleshooting mode using the CentOS 7 media disk):
2) Read-only mount
3) Skip to shell
4) Quit (Reboot)
Please make a selection from the above: 1
Your system has been mounted under /mmt/sysimage.
If you would like to make your system the root environment, run the
Please press to get a shell.
When finished, please exit from the shell and your system will reboot.
sh-4.2# umount /dev/vda1
sh-4.2# xfs_admin -U restore /dev/vda1
Clearing log and setting UUID
writing all SBs
new UUID = b05227b2-7c86-4ccf-81ff-204a9a80f789
sh-4.2# mount /dev/vda1 /mmt/sysimage/boot
sh-4.2# chroot /mnt/sysimage
bash-4.2# grub2-install /dev/vda
Installing for i386-pc platform.
Installation finished. No error reported.
bash-4.2# nano /etc/fstab
Note also that after logging into the (finally bootable) OS, we should follow the directions: “Resetting and Reinstalling GRUB 2”.
Best regards, Nick