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Setup details: I am setting up openwhisk on my local ubuntu(16.04) vm. in this setup kafka is running in one docker and zookeeper in another docker.

I connect to the the kafka docker using cmd 

sudo docker exec -it <container id> sh

once connected i execute the following command to get the list of topics

bin/kafka-topics.sh --list --zookeeper localhost:2181

which gives me an exception

Error: Exception thrown by the agent : java.rmi.server.ExportException: Port already in use: 7203; nested exception is:
        java.net.BindException: Address already in use

i am unable to understand why is it trying to use 7203 port?

docker ps output

83eba3961247        ches/kafka:0.10.0.1              "/start.sh"              
11 days ago         Up 23 hours         7203/tcp, 0.0.0.0:9092->9092/tcp                                                                                                                       
kafka
947fa689a7ef        zookeeper:3.4                    "/docker-
entrypoin..."   11 days ago         Up 23 hours         2888/tcp, 
0.0.0.0:2181->2181/tcp, 3888/tcp                                                                                                             zookeeper
markusthoemmes
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Katiyman
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1 Answers1

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The Kafka container OpenWhisk is using sets a JMX_PORT by default. That's the 7203 port you're seeing. To get your script to work you need to unset that environment setting:

unset JMX_PORT; bin/kafka-topics.sh --list --zookeeper localhost:2181

Note though, that localhost is not a valid address for your zookeeper instance, as it refers to the localhost of the current container, which is not Zookeeper. If you exchange localhost with the external IP of your VM or the IP of the zookeeper container (get it via docker inspect zookeeper --format {{.NetworkSettings.Networks.bridge.IPAddress}}) your topics should be listed fine.

markusthoemmes
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    Thanks it worked. one more ques will this unsetting of the JMX_PORT will impact the working of the openwhisk setup in any way? – Katiyman May 17 '17 at 06:34
  • No it won't. It's only relevant for your single call anyway and the setup as it stands in OpenWhisk does not use JMX from Kafka at all. – markusthoemmes May 17 '17 at 06:37
  • echo $JMX_PORT : To check what is port no used by JMX. export JMX_PORT=NEW_PORT_NUMBER : to assign new port no. – Vadiraj S J Feb 10 '21 at 07:04