[KAFKA-4121] Allow creating broker listeners from hostname

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 0.10.0.1
• Component/s: config
• Assignee: Unassigned
• Reporter: Joaquin Casares
• Created: 03/Sep/16 21:56
• Updated: 12/Sep/16 16:10
• Resolved: 12/Sep/16 16:10

Description

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

advertised.listeners = PLAINTEXT://dockercomposeproject_kafka_1:9092

However, I get this error:

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)

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

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

Which resolves to:

advertised.listeners = PLAINTEXT://172.18.0.4:9092

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!

Issue Links

• duplicates: KAFKA-3017 hostnames with underscores '_' are not valid