Major Description
I think that this isn't a bug, but I don't know what type to choose for this issue.
I'm setting up kafka security with multiple listeners. Listener for broker works as plaintext and I don't want to use authentication for them. My cluster has configuration:
listeners=BROKERS://:9091,CLIENTS://:9092,CLIENTS-NOSSL://:9093 inter.broker.listener.name=BROKERS sasl.enabled.mechanisms=SCRAM-SHA-256 listener.security.protocol.map=BROKERS:PLAINTEXT,CLIENTS:SASL_SSL,CLIENTS-NOSSL:SASL_PLAINTEXT
For clients, I want use SCRAM and only for them (not for brokers). But when I start broker, I see following message in log:
ERROR [KafkaServer id=0] Fatal error during KafkaServer startup. Prepare to shutdown (kafka.server.KafkaServer) java.lang.IllegalArgumentException: Could not find a 'KafkaServer' or 'clients.KafkaServer' entry in the JAAS configuration. System property 'java.security.auth.login.config' is not set
Why is this configuration so necessary, if I don't use authentication for brokers and SCRAM mechanism stores credentials in zookeeper? Which user do I need to add to sasl.jaas.config? I have created users who perform operations as consumers and producers. I didn't create any admin users because I don't need it. I didn't find any more detailed information in docs about why this is so necessary.
For experiment:
listener.name.clients.scram-sha-256.sasl.jaas.config=org.apache.kafka.common.security.scram.ScramLoginModule required \
username="alice" \
password="alice-secret";
--
listener.name.clients-nossl.scram-sha-256.sasl.jaas.config=org.apache.kafka.common.security.scram.ScramLoginModule required \
username="alice" \
password="alice-secret";
I specified user alice in sasl.jaas.config, but I didn't create this user and Kafka starts correctly. What is the logic of this?