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Short Description
Confluent Platform Zookeeper
Full Description

Confluent Platform ZooKeeper

This is a highly configurable Dockerized Apache ZooKeeper image which is part of the Confluent Platform.

How to use this image

The container can be configured via environment variables where any ZooKeeper property can be set after zk_ with underscore instead of period ('.') used. For example:

Environment Variable Zookeeper Property Default
zk_tickTime tickTime 2000
zk_initLimit initLimit 5
zk_syncLimit syncLimit 2

A few sensible values have been set as given above.

The data directory, /var/lib/zookeeper, is exposed for mounting to your local host. This facilitates using external storage for data and snapshots and the transaction logs. The configuration directory, /etc/kafka, is also exposed for mounting such that you can use your own configuration file, zookeeper.properties, and also take advantage of variable substitution.

Using your configuration file

This image also provides for a remote properties file to be used, which will also be processed for variable substitution. To download a remote properties file, set the environment variable zk_cfg_url to the location of the file.

Standalone mode

If you are happy with the defaults, just run the container to get ZooKeeper in standalone mode:

docker run --rm --name zk -p 2181:2181 cgswong/confluent-zookeeper

Cluster mode

To run a cluster just set more zk_server_X environment variables, where X is the respective ZooKeeper ID, set to the respective IP/hostname. You'll also need to publish the respective cluster ports. For example:

docker run -d --name zk1 \
  -p 2181:2181 -p 2888:2888 -p 3888:3888 \
  -e zk_id=1 -e zk_server_1=172.17.8.101 -e zk_server_2=172.17.8.102 -e zk_server_3=172.17.8.103 \
  cgswong/confluent-zookeeper
docker run -d --name zk2 \
  --publish 2181:2181 --publish 2888:2888 --publish 3888:3888 \
  -e zk_id=2 -e zk_server_1=172.17.8.101 -e zk_server_2=172.17.8.102 -e zk_server_3=172.17.8.103 \
  cgswong/confluent-zookeeper
docker run -d --name zk3 \
  -p 2181:2181 -p 2888:2888 -p 3888:3888 \
  -e zk_id=3 -e zk_server_1=172.17.8.101 -e zk_server_2=172.17.8.102 -e zk_server_3=172.17.8.103 \
  cgswong/confluent-zookeeper

The above commands are run across 3 separate hosts. To form a cluster on a single host change the local port mappings to avoid collisions.

Acknowledgement

This image is a fork of the main ConfluentInc Platform. As I do contribute back you may see some of these features included, however, some may not be included or take longer to be merged. I created this version not only to contribute back to a really good project, but also to learn, and have a version which was more robust (production ready since this is being used as such), with a more timely update cycle (for the time being anyways).

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cgswong
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