kdc.conf(5) on Linux
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Kerberos V5 KDC configuration file The kdc.conf file supplements krb5.conf for programs which are typically only used on a KDC, such as the krb5kdc and kadmind daemons and the kdb5_util program. Relations documented here may also be specified in krb5.conf; for the KDC programs mentioned, krb5.conf and kdc.conf will be merged into a single configuration profile. Normally, the kdc.conf file is found in the KDC state directory, /var/lib/krb5kdc. You can override the default location by setting the environment variable KRB5_KDC_PROFILE. Please note that you need to restart the KDC daemon for any configuration changes to take effect.