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https://issues.apache.org/jira/browse/KAFKA-13003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Eisele resolved KAFKA-13003.
--------------------------------
Resolution: Fixed
Pull Request #10935 has been merged.
> KafkaBroker advertises socket port instead of the configured advertised port
> ----------------------------------------------------------------------------
>
> Key: KAFKA-13003
> URL: https://issues.apache.org/jira/browse/KAFKA-13003
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 2.8.0
> Reporter: Uwe Eisele
> Assignee: Uwe Eisele
> Priority: Critical
> Labels: kip-500
> Fix For: 3.0.0
>
>
> In Kraft mode Apache Kafka 2.8.0 does advertise the socket port instead of
> the configured advertised port.
> A broker given with the following configuration
> {code:java}
> listeners=PUBLIC://0.0.0.0:19092,REPLICATION://0.0.0.0:9091
> advertised.listeners=PUBLIC://envoy-kafka-broker:9091,REPLICATION://kafka-broker1:9091
> {code}
> advertises on the _PUBLIC_ listener _envoy-kafka-broker:19092_, however I
> would expect that _envoy-kafka-broker:9091_ is advertised. In ZooKeeper mode
> it works as expected.
> In a deployment with a L4 proxy in front of the Kafka cluster, it is
> important, that the advertised port can be different from the actual socket
> port.
> I tested it with a Docker-Compose setup which runs 3 Kafka Broker in Kraft
> mode and an Envoy proxy in front of them. With Apache Kafka 2.8.0 it does not
> work, because Kafka does not advertise the configured advertised port. For
> more details see:
> https://github.com/ueisele/kafka/tree/fix/kraft-advertisedlisteners-build/proxy-examples/proxyl4-kafkakraft-bug-2.8
> _Client -- 909[1-3] --> Envoy Proxy -- 19092 --> Kafka Broker [1-3]_
> || Envoy Host || Envoy Port || Kafka Broker || Kafka Port || Advertised
> Listener ||
> | envoy-kafka-broker | 9091 | kafka-broker1 | 19092 | envoy-kafka-broker:9091
> |
> | envoy-kafka-broker | 9092 | kafka-broker2 | 19092 | envoy-kafka-broker:9092
> |
> | envoy-kafka-broker | 9093 | kafka-broker3 | 19092 | envoy-kafka-broker:9093
> |
> {code:bash}
> > docker-compose exec kafkacat kafkacat -b envoy-kafka-broker:9091 -L
> Metadata for all topics (from broker -1: envoy-kafka-broker:9091/bootstrap):
> 3 brokers:
> broker 101 at envoy-kafka-broker:19092
> broker 102 at envoy-kafka-broker:19092 (controller)
> broker 103 at envoy-kafka-broker:19092
> 0 topics:
> {code}
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