How does root authentication work with kerberos?

To my understanding, it appears as if the root user can authenticate both 
locally and on the kerberos KDC.

I have successfully been able to login onto a kerberized redhat linux 8 
machine using both the root password
established locally as well as the kerberos principle password without 
making any configuration changes between
logins.

I assume this is working as designed. Any idea how to disable the local 
logon for root while still allowing the
kerberized logon (or is this just a bad idea altogether?)

Thanks in advance!

---------------
James Walthall Jr
IBM Host Integration Server Test / HATS
Outside: (919) 254-8869
Tieline: 444-8869
Research Triangle Park
Raleigh, North Carolina
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