[![Docker Pulls](]( [![Docker Stars](]( [![](]( kafka-docker ============ Dockerfile for [Apache Kafka]( The image is available directly from ##Pre-Requisites - install docker-compose []( - modify the ```KAFKA_ADVERTISED_HOST_NAME``` in ```docker-compose.yml``` to match your docker host IP (Note: Do not use localhost or as the host ip if you want to run multiple brokers.) - if you want to customise any Kafka parameters, simply add them as environment variables in ```docker-compose.yml```, e.g. in order to increase the ```message.max.bytes``` parameter set the environment to ```KAFKA_MESSAGE_MAX_BYTES: 2000000```. To turn off automatic topic creation set ```KAFKA_AUTO_CREATE_TOPICS_ENABLE: 'false'``` ##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 []( 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 []( If ```KAFKA_ADVERTISED_HOST_NAME``` is specified, it takes presendence over ```HOSTNAME_COMMAND``` ##Tutorial [](