One thought on - CentOS 7 Cloned VM Cannot Boot

• 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):

  1) Continue

  2) Read-only mount

  3) Skip to shell

  4) Quit (Reboot)

  Please make a selection from the above: 1
  =======================================================
  =======================================================
  Rescue Mount

  Your system has been mounted under /mmt/sysimage.

  If you would like to make your system the root environment, run the
  command:

  chroot /mnt/sysimage
  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
  bash-4.2# exit
  sh-4.2#

  Note also that after logging into the (finally bootable) OS, we should follow the directions: “Resetting and Reinstalling GRUB 2”.

  https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/sec-Reinstalling_GRUB_2.html#sec-Resetting_and_Reinstalling_GRUB_2

  Best regards, Nick