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Chapter 7. L

7.1. Listener
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Defines how clients connect to the Kafka cluster. Streams for Apache Kafka supports several listener types for exposing Kafka internally or externally.

Listener types:

internal
Kafka exposed only within the OpenShift cluster
route
Kafka exposed externally using OpenShift Routes
loadbalancer
Kafka exposed externally using a LoadBalancer service
nodeport
Kafka exposed externally using NodePort services
ingress
Kafka exposed externally using OpenShift NGINX Ingress with TLS passthrough
cluster-ip
Kafka exposed using a per-broker ClusterIP service

7.2. Logging (configuration)
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Logging for Kafka components and Streams for Apache Kafka operators is configured through their custom resources. The configuration uses Log4j2 and supports dynamic updates without restarting pods.

Configuration methods:

inline
Loggers and levels are defined directly in the custom resource. Used for simple changes to log levels.
external
Loggers and levels are defined in a ConfigMap referenced by the custom resource. Used for complex, reusable, or filtered configurations.
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