Kafka + Kubernetes + Helm + `/usr/bin/kafka-avro-console-consumer`?
java.rmi.server.ExportException: Port already in use: 5555;
Sounds like you've enabled JMX as part of that container via the KAFKA_JMX_PORT variable.
If that's the case, you will need to temporarily override that by exporting (or unset) it within the shell session to a different value before running any other Kafka scripts