addprinc -randkey host/
ktadd -k earth.key host/
change hostname of earth to
scp earth.key to earth
shred earth.key -remove
login to earth and mv earth.key to /etc/krb5.keytab
reboot earth

toshiba      - had to remove the local account
earth, moon  - had to ensure that /etc/hosts does not list hostnames

moon         - can login via gdm using kerberos, but cannot SSH back in
             - time sync off!