Kafka Backup

Update: I am no longer maintaining the Kafka Backup project. As an alternative, I recommend Kannika, a commercial backup solution developed by my friends at Cymo (and don't forget to say hello from Anatoly 😊). [Disclosure: I am a business partner of Cymo and may receive compensation for referrals to Kannika]

Please contact me if you want to continue maintaining this project.

Kafka Backup is a tool to back up and restore your Kafka data including all (configurable) topic data and especially also consumer group offsets. To the best of our knowledge, Kafka Backup is the only viable solution to take a cold backup of your Kafka data and restore it correctly.

It is designed as two connectors for Kafka Connect: A sink connector (backing data up) and a source connector (restoring data).

Currently kafka-backup supports backup and restore to/from the file system.

Features

• Backup and restore topic data
• Backup and restore consumer-group offsets
• Currently supports only backup/restore to/from local file system
• Released as a jar file or packaged as a Docker image

Getting Started

Option A) Download binary

Download the latest release from GitHub and unzip it.

Option B) Use Docker image

Pull the latest Docker image from Docker Hub

DO NOT USE THE latest STAGE IN PRODUCTION. latest are automatic builds of the master branch. Be careful!

Option C) Build from source

Just run ./gradlew shadowJar in the root directory of Kafka Backup. You will find the CLI tools in the bin directory.

Start Kafka Backup

backup-standalone.sh --bootstrap-server localhost:9092 \
    --target-dir /path/to/backup/dir --topics 'topic1,topic2'

In Docker:

docker run -d -v /path/to/backup-dir/:/kafka-backup/ --rm \
    kafka-backup:[LATEST_TAG] \
    backup-standalone.sh --bootstrap-server kafka:9092 \
    --target-dir /kafka-backup/ --topics 'topic1,topic2'

You can pass options via CLI arguments or using environment variables:

Parameter	Type/required?	Description
--bootstrap-server BOOTSTRAP_SERVER	[REQUIRED]	The Kafka server to connect to
--target-dir TARGET_DIR	[REQUIRED]	Directory where the backup files should be stored
--topics TOPICS	<T1,T2,…>	List of topics to be backed up. You must provide either --topics or --topics-regex. Not both
--topics-regex TOPICS_REGEX		Regex of topics to be backed up. You must provide either --topics or --topics-regex. Not both
--max-segment-size MAX_SEGMENT_SIZE		Size of the backup segments in bytes DEFAULT: 1GiB
--command-config COMMAND_CONFIG		Property file containing configs to be passed to Admin Client. Only useful if you have additional connection options
--debug DEBUG=y		Print Debug information
--help		Prints this message

Kafka Backup does not stop! The Backup process is a continous background job that runs forever as Kafka models data as a stream without end. See Issue 52: Support point-in-time snapshots for more information.

Restore data

restore-standalone.sh --bootstrap-server localhost:9092 \
    --target-dir /path/to/backup/dir --topics 'topic1,topic2'

In Docker:

docker run -v /path/to/backup/dir:/kafka-backup/ --rm \
    kafka-backup:[LATEST_TAG]
    restore-standalone.sh --bootstrap-server kafka:9092 \
    --source-dir /kafka-backup/ --topics 'topic1,topic2'

You can pass options via CLI arguments or using environment variables:

Parameter	Type/required?	Description
--bootstrap-server BOOTSTRAP_SERVER	[REQUIRED]	The Kafka server to connect to
--source-dir SOURCE_DIR	[REQUIRED]	Directory where the backup files are found
--topics TOPICS	[REQUIRED]	List of topics to restore
--batch-size BATCH_SIZE		Batch size (Default: 1MiB)
--offset-file OFFSET_FILE		File where to store offsets. THIS FILE IS CRUCIAL FOR A CORRECT RESTORATION PROCESS IF YOU LOSE IT YOU NEED TO START THE BACKUP FROM SCRATCH. OTHERWISE YOU WILL HAVE DUPLICATE DATA Default: [source-dir]/restore.offsets
--command-config COMMAND_CONFIG		Property file containing configs to be passed to Admin Client. Only useful if you have additional connection options
--help HELP		Prints this message
--debug DEBUG		Print Debug information (if using the environment variable, set it to 'y')

More Documentation

• FAQ
• High Level Introduction
• Comparing Kafka Backup Solutions
• Architecture
• Tooling

License

This project is licensed under the Apache License Version 2.0 (see LICENSE).