kafka_server_jaas.conf

// Kafka Client authentication
KafkaClient {
    com.sun.security.auth.module.Krb5LoginModule required
    useKeyTab=true
    storeKey=true
    keyTab="/etc/kafka/keytabs/schemaregistry.keytab"
    principal="schemaregistry@EXAMPLE.COM";
};

// Zookeeper client authentication
Client {
    com.sun.security.auth.module.Krb5LoginModule required
    useKeyTab=true
    storeKey=true
    keyTab="/etc/kafka/keytabs/myzkclient.keytab"
    principal="myzkclient@EXAMPLE.COM";
};