trajano/kafka repository overview

⁠Kafka in Docker

This is based on the idea from spotify/kafka which provides a single image containing both kafka and zookeeper. The intent of this image is primarily to support development while production systems may use a managed solution like Amazon MSK.

This follows the instruction of the Kafka quickstart⁠

⁠Memory

ZOOKEEPER_HEAP_OPTS and KAFKA_HEAP_OPTS specify the heap sizes. It is not recommended to use the cgroup limits (i.e. -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap) unless you plan to give it ample size which is around 1GB. The sizes set allow the container to run with a memory limit of 256MB (with swap).

⁠Advertised host port

The default advertised host port is localhost:9092. If this needs to change set the environment KAFKA_ADVERTISED_HOST_PORT.

⁠Commands

• kafka starts Zookeeper and Kafka
• messages <topic> shows the messages in a given topic.
• topics lists all the topics