Using RHEL 8 virtual disk images on a RHEL 7 host sometimes fails

Solution Verified - Updated -

Issue

  • On a RHEL 7 host, using libguestfs utilities such as guestfish, virt-sysprep, or virt-customize to access or modify a RHEL 8 virtual disk image fails if the disk image is using an XFS or ext4 file system.

  • For example:

# /usr/bin/virt-sysprep -a RHEL8.img
['
[   0.0] Examining the guest ...
virt-sysprep: warning: mount_options: mount exited with status 32: mount:
wrong fs type, bad option, bad superblock on /dev/mapper/rhel-root,
       missing codepage or helper program, or other error', '
       In some cases useful info is found in syslog - try
       dmesg | tail or so. (ignored)', 'virt-sysprep: warning: mount_options: mount: /boot: mount point is not a
       directory (ignored)
[  15.5] Performing "abrt-data" ...']
  • In RHV 4.3, it is not possible to create a template of RHEL8 guest due to this behavior

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Virtualization if RHEL 7 is used as the virtualization host
  • Red Hat Virtualization (RHV) 4.3

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