Well, you would have the login, but not the kerberos init. You would still have two realms with user credentials the KRB5 realm and the LDAP realm depending on your setup. Actually the KRB5 realm can be included inside LDAP or put differently Kerberos can be configured to use LDAP as it's user DB, that would give you the possibility to combine both. This essential is what FreeIPA is.
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