The zipkin-kafka testing image runs both Kafka+ZooKeeper for the Kafka collector
and the upcoming Kafka storage.
To build openzipkin/zipkin-kafka, from the top level of the repository, run:
$ docker build -t openzipkin/zipkin-kafka:test -f docker/collector/kafka/Dockerfile .Then configure the Kafka sender using a bootstrapServers value of host.docker.internal:9092 if your application is inside the same docker network or localhost:19092 if not, but running on the same host.
In other words, if you are running a sample application on your laptop, you would use localhost:19092 bootstrap server to send spans to the Kafka broker running in Docker.