First make sure that no users have jailed shell access in the “Manage Shell Access” interface. You can then use the script that you found in the blog post to unmout any bind-mounted directories.
for i in `cat /proc/mounts | awk ‘/virtfs/ {print $2}’`; do umount $i;done
CPanel also provides a script to remove the virtfs mounts:
/scripts/clear_orphaned_virtfs_mounts –clearall
If you need any further assistance contact me @ [email protected].. prefer hangout 🙂