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Multi-Broker kafka 0.9.x image
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kafka-docker

Dockerfile for Apache Kafka

The image is available directly from https://registry.hub.docker.com/

##Pre-Requisites

  • Make sure the environment variable KAFKA_ZOOKEEPER_CONNECT is set to the Zookeeper instance (ie. 192.168.99.100:2181).

##Usage

Start a cluster:

  • docker-compose up -d

Add more brokers:

  • docker-compose scale kafka=3

Destroy a cluster:

  • docker-compose stop

##Note

The default docker-compose.yml should be seen as a starting point. By default each broker will get a new port number and broker id on restart. Depending on your use case this might not be desirable. If you need to use specific ports and broker ids, modify the docker-compose configuration accordingly, e.g. docker-compose-single-broker.yml:

  • docker-compose -f docker-compose-single-broker.yml up

##Broker IDs

If you don't specify a broker id in your docker-compose file, it will automatically be generated (see https://issues.apache.org/jira/browse/KAFKA-1070. This allows scaling up and down. In this case it is recommended to use the --no-recreate option of docker-compose to ensure that containers are not re-created and thus keep their names and ids.

##Automatically create topics

If you want to have kafka-docker automatically create topics in Kafka during
creation, a KAFKA_CREATE_TOPICS environment variable can be
added in docker-compose.yml.

Here is an example snippet from docker-compose.yml:

    environment:
      KAFKA_CREATE_TOPICS: "Topic1:1:3,Topic2:1:1"

Topic 1 will have 1 partition and 3 replicas, Topic 2 will have 1 partition and 1 replica.

##Advertised hostname

You can configure the advertised hostname in different ways

  1. explicitly, using KAFKA_ADVERTISED_HOST_NAME
  2. via a command, using HOSTNAME_COMMAND, e.g. HOSTNAME_COMMAND: "route -n | awk '/UG[ \t]/{print $$2}'"

When using commands, make sure you review the "Variable Substitution" section in https://docs.docker.com/compose/compose-file/

If KAFKA_ADVERTISED_HOST_NAME is specified, it takes presendence over HOSTNAME_COMMAND

##Tutorial

http://wurstmeister.github.io/kafka-docker/

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bertramtruong
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