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Containers / ksql: README

Last updated on Aug 05, 2025

KSQL DB packaged by Bitnami

What is ksql?

Confluent KSQL DB is an event streaming database that helps you build stream processing apps

Overview of ksql

TL;DR

docker run --name ksql bitnami/ksql:latest

Why use Bitnami Images?

  • Bitnami closely tracks upstream source changes and promptly publishes new versions of this image using our automated systems.
  • With Bitnami images the latest bug fixes and features are available as soon as possible.
  • Bitnami containers, virtual machines and cloud images use the same components and configuration approach - making it easy to switch between formats based on your project needs.
  • All our images are based on minideb -a minimalist Debian based container image that gives you a small base container image and the familiarity of a leading Linux distribution- or scratch -an explicitly empty image-.
  • All Bitnami images available in Docker Hub are signed with Notation. Check this post to know how to verify the integrity of the images.
  • Bitnami container images are released on a regular basis with the latest distribution packages available.

Looking to use ksql in production? Try VMware Tanzu Application Catalog, the commercial edition of the Bitnami catalog.

Supported tags and respective Dockerfile links

Learn more about the Bitnami tagging policy and the difference between rolling tags and immutable tags in our documentation page.

You can see the equivalence between the different tags by taking a look at the tags-info.yaml file present in the branch folder, i.e bitnami/ASSET/BRANCH/DISTRO/tags-info.yaml.

Subscribe to project updates by watching the bitnami/containers GitHub repo.

Get this image

The recommended way to get the Bitnami ksql Docker Image is to pull the prebuilt image from the Docker Hub Registry.

docker pull bitnami/ksql:latest

To use a specific version, you can pull a versioned tag. You can view the list of available versions in the Docker Hub Registry.

docker pull bitnami/ksql:[TAG]

If you wish, you can also build the image yourself by cloning the repository, changing to the directory containing the Dockerfile and executing the docker build command. Remember to replace the APP, VERSION and OPERATING-SYSTEM path placeholders in the example command below with the correct values.

git clone https://github.com/bitnami/containers.git
cd bitnami/APP/VERSION/OPERATING-SYSTEM
docker build -t bitnami/APP:latest .

Environment variables

Customizable environment variables

Name Description Default Value
KSQL_MOUNTED_CONF_DIR Directory for including custom configuration files (that override the default generated ones) ${KSQL_VOLUME_DIR}/etc
KSQL_LISTENERS Comma-separated list of listeners that listen for API requests over either HTTP or HTTPS. nil
KSQL_SSL_KEYSTORE_PASSWORD Password to access the SSL keystore. nil
KSQL_SSL_TRUSTSTORE_PASSWORD Password to access the SSL truststore. nil
KSQL_CLIENT_AUTHENTICATION Client authentication configuration. Valid options: none, requested, over required. nil
KSQL_BOOTSTRAP_SERVERS The set of Kafka brokers to bootstrap Kafka cluster information from. nil

Read-only environment variables

Name Description Value
KSQL_BASE_DIR Base path for KSQL files. ${BITNAMI_ROOT_DIR}/ksql
KSQL_VOLUME_DIR KSQL directory for persisted files. ${BITNAMI_VOLUME_DIR}/ksql
KSQL_DATA_DIR KSQL data directory. ${KSQL_VOLUME_DIR}/data
KSQL_BIN_DIR KSQL bin directory. ${KSQL_BASE_DIR}/bin
KSQL_CONF_DIR KSQL configuration directory. ${KSQL_BASE_DIR}/etc/ksqldb
KSQL_LOGS_DIR KSQL logs directory. ${KSQL_BASE_DIR}/logs
KSQL_CONF_FILE Main KSQL configuration file. ${KSQL_CONF_DIR}/ksql-server.properties
KSQL_CERTS_DIR KSQL certificates directory. ${KSQL_BASE_DIR}/certs
KSQL_DAEMON_USER Users that will execute the KSQL Server process. ksql
KSQL_DAEMON_GROUP Group that will execute the KSQL Server process. ksql
KSQL_DEFAULT_LISTENERS Comma-separated list of listeners that listen for API requests over either HTTP or HTTPS. http://0.0.0.0:8088
KSQL_DEFAULT_BOOTSTRAP_SERVERS List of Kafka brokers to bootstrap Kafka cluster information from. localhost:9092

Notable Changes

Starting January 16, 2024

  • The docker-compose.yaml file has been removed, as it was solely intended for internal testing purposes.

Contributing

We'd love for you to contribute to this container. You can request new features by creating an issue or submitting a pull request with your contribution.

Issues

If you encountered a problem running this container, you can file an issue. For us to provide better support, be sure to fill the issue template.

License

Copyright © 2024 Broadcom. The term "Broadcom" refers to Broadcom Inc. and/or its subsidiaries.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.