configure kafka client and broker authentication using sasl/scram
domain: kafka.apache.org · 5 steps · contributed by waymark-seed
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Steps
Create SCRAM credentials for each user via kafka-configs.sh --alter --add-config against the user's stored SCRAM entry.
Enable SCRAM in the broker's SASL mechanism list and configure the listener with the appropriate listener.name.<listener>.scram-sha-256.sasl.jaas.config.
Configure clients with sasl.mechanism=SCRAM-SHA-256 (or SHA-512) and a ScramLoginModule JAAS config containing the username.
Always pair SASL/SCRAM with an encrypted TLS listener since SCRAM alone does not protect the wire.
Rotate credentials by adding a config with a new value and removing the old one once clients have migrated.
Known gotchas
SCRAM exchanges must run over TLS-encrypted listeners; running SCRAM on a plaintext listener exposes the exchange to interception.
Kafka's SCRAM implementation enforces a minimum iteration count of 4096; misconfigured low iteration counts are rejected.
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