[jira] [Created] (KAFKA-4121) Allow creating broker listeners from hostname

[Joaquin Casares (JIRA)]

Joaquin Casares created KAFKA-4121:
--------------------------------------

             Summary: Allow creating broker listeners from hostname
                 Key: KAFKA-4121
                 URL: https://issues.apache.org/jira/browse/KAFKA-4121
             Project: Kafka
          Issue Type: Improvement
          Components: config
    Affects Versions: 0.10.0.1
            Reporter: Joaquin Casares
            Priority: Minor


I'm attempting to start a docker container using the parameter:

{CODE}
advertised.listeners = PLAINTEXT://dockercomposeproject_kafka_1:9092
{CODE}

However, I get this error:

{CODE}
kafka_1      | java.lang.IllegalArgumentException: Error creating broker 
listeners from 'PLAINTEXT://dockercomposeproject_kafka_1:9092': Unable to parse 
PLAINTEXT://dockercomposeproject_kafka_1:9092 to a broker endpoint
kafka_1      |  at 
kafka.server.KafkaConfig.validateUniquePortAndProtocol(KafkaConfig.scala:954)
kafka_1      |  at 
kafka.server.KafkaConfig.getAdvertisedListeners(KafkaConfig.scala:985)
kafka_1      |  at kafka.server.KafkaConfig.<init>(KafkaConfig.scala:927)
kafka_1      |  at kafka.server.KafkaConfig$.fromProps(KafkaConfig.scala:743)
kafka_1      |  at kafka.server.KafkaConfig$.fromProps(KafkaConfig.scala:740)
kafka_1      |  at 
kafka.server.KafkaServerStartable$.fromProps(KafkaServerStartable.scala:28)
kafka_1      |  at kafka.Kafka$.main(Kafka.scala:58)
kafka_1      |  at kafka.Kafka.main(Kafka.scala)
{CODE}

My workaround is to set my envar (for the wurstmeister/kafka-docker, which is 
unrelated to this ticket) to:

{CODE}
KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://`getent hosts 
dockercomposeproject_kafka_1 | awk '{ print $1 }'`:9092
{CODE}

Which resolves to:

{CODE}
advertised.listeners = PLAINTEXT://172.18.0.4:9092
{CODE}

This advertised.listeners resolution allows my docker container to start as 
expected.

Could sending in hostnames, instead of strict IP addresses, be supported for 
the advertised.listeners setting?

Thanks!



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