About:

Docker image based on openjdk:8-jre-alpine

Additional Software:

• Apache Kafka

Usage:

The image provides a clusterable Kafka broker.

As a minimum the following environment variables must be set:

1. KAFKA_BROKER_ID
2. KAFKA_ADVERTISED_HOST_NAME
3. KAFKA_ZOOKEEPER_CONNECT

So, assuming your Docker host is 172.17.8.101, has Zookeeper running and should now run Kafka as well, execute the following:

docker run -d -e KAFKA_BROKER_ID=1 -e KAFKA_ADVERTISED_HOST_NAME=172.17.8.101 -e KAFKA_ZOOKEEPER_CONNECT=172.17.8.101 digitalwonderland/kafka

(if you are looking for a clusterable Zookeeper Docker image, feel free to use digitalwonderland/zookeeper)

Additional Configuration

Configuration parameters can be provided via environment variables starting with KAFKA_. Any matching variable will be added to Kafkas server.properties by

1. removing the KAFKA_ prefix
2. transformation to lower case
3. replacing any occurences of _ with .

For example an environment variable KAFKA_NUM_PARTITIONS=3 will result in num.partitions=3 within server.properties.

Evaluated Parameters

Any environment variable starting with KAFKA_ and ending with _COMMAND will be first evaluated and the result saved in an environment variable without the trailing _COMMAND.

For example an environment variable KAFKA_ADVERTISED_HOST_NAME_COMMAND=hostname will export KAFKA_ADVERTISED_HOST_NAME with the value obtained by running hostname command inside the container.