Kafka Client running on docker fails to connect to broker running on Windows Host

Clients Non-Java Clients
1

Our kafka setup currently comprises of the ZooKeeper, Brokers installed on a Windows Host environment (non dockerized). The Kafka client will be deployed to a linux container.
We are currently unable to connect to the Kafka brokers on the Host PC from the Kafka Client in the container, we encounter the below error
IPv4 127.0.0.1:9092 connection refused

We have tried configuring host.docker.internal to the Kafka client setup configuration, but the error still persists.

Can anyone please suggest a solution for this.

2

What is your advertised listener property set to? And is that address reachable from the docker container?

3

It’d be easier if Kafka was containerized on the same host as well, then you can use a standard Docker network bridge to connect.

The real issue to the problem, however, is that 127.0.0.1 inside a container refers to itself, not the external host machine, so you need to update the Kafka advertised.listeners to contain host.docker.internal as well as use this address in the container.