I am spinning up a docker image for our application(.net application). Now I am making use of docker compose file to spin up kafka, zookeeper. I expect that my .Net application can identify the broker which is running on port 29092. I tried creating a common network and believed it will communicate …

@meyay Thank you for the reply. Yes, you are right telnet was just used to check of the images could communicate with each other. So i pinged the kafka container from my ,Net application container(and not from the host). I have placed the docker compose file here : GitHub - jaikishpai/docker-repo …

[image] jkshpai: Yes, you are right telnet was just used to check of the images could communicate with each other. I am not sure why you keep calling containers images. An image is the delivery artifact at rest: it’s a manifest and tar archives for the image layers, no running process, no not…

@meyay Sorry about my wrong “docker” vocabulary. I am a bit new to Docker and trying to learn myself. :slight_smile: So do you find any reason from my docker compose file why my application running in one container not able to communicate with the kafka container? Do you have any suggestions or adv…

I thought your main concern is to bind kafka to localhost, which doesn’t make sense for container to container communication. KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://broker:9092,PLAINTEXT_HOST://localhost:29092 The PLAINTEXT_HOST can’t be right. It is only usefull, if the container uses the …

Thanks @meyay . I thought my issue was described clearly in my Thread. Sorry if it was not. Thanks for your effort trying to help. I tried looking into the documentation and it is as it is in my compose file.

Please share the link to the documentation.

How did you create “a common network”?

[image] Kafka Listeners – Explained | Confluent You need to set advertised.listeners (or KAFKA_ADVERTISED_LISTENERS if you’re using Docker images) to the external address (host/IP) so that clients can correctly connect to it. Otherwise, they’ll try to connect to the internal host address…

@bluepuma77 This is how i created the network networks: default: driver: bridge

Kafka client unable to communicate with Kafka broker

General

meyay (Metin Y.) November 25, 2023, 10:46am 2

Images are just the packaging and delivery item. You create and run a container based on an image.

I am not sure how telnet access is related to ping, but I assume you mean telnet can not reach the target host port.

Please share the content of the used compose file, and let us know whether you executed the telnet command on the host or inside a container.

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Kafka client unable to communicate with Kafka broker

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