hadoop/hadoop-hdfs-project/hadoop-hdfs/src/test/resources/krb5.conf

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[libdefaults]
   default_realm = EXAMPLE.COM
   allow_weak_crypto = true
   kdc_realm = _REALM_
   udp_preference_limit = _UDP_LIMIT_
   #_KDC_TCP_PORT_
   #_KDC_UDP_PORT_

[realms]
        _REALM_ = {
                kdc = localhost:_KDC_PORT_
        }

[domain_realm]
        .example.com = _REALM_
        example.com = _REALM_

[login]
        krb4_convert = true
        krb4_get_tickets = false