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Documentation

MinIO Object Storage for Linux

Kafka Notification Settings

This page documents settings for configuring an Kafka service as a target for Bucket Notifications. See Publish Events to Kafka for a tutorial on using these settings.

You can establish or modify settings by defining:

  • an environment variable on the host system prior to starting or restarting the MinIO Server. Refer to your operating system’s documentation for how to define an environment variable.

  • a configuration setting using mc admin config set.

  • a configuration setting using the MinIO Console’s Administrator > Settings pages.

If you define both an environment variable and the similar configuration setting, MinIO uses the environment variable value.

Some settings have only an environment variable or a configuration setting, but not both.

Important

Each configuration setting controls fundamental MinIO behavior and functionality. MinIO strongly recommends testing configuration changes in a lower environment, such as DEV or QA, before applying to production.

Multiple Kafka Targets

You can specify multiple Kafka service endpoints by appending a unique identifier _ID for each set of related Kafka settings on to the top level key.

Examples

For example, the following commands set two distinct Kafka service endpoints as PRIMARY and SECONDARY respectively:

set MINIO_NOTIFY_KAFKA_ENABLE_PRIMARY="on"
set MINIO_NOTIFY_KAFKA_BROKERS_PRIMARY="https://kafka1.example.net:9200, https://kafka2.example.net:9200"

set MINIO_NOTIFY_KAFKA_ENABLE_SECONDARY="on"
set MINIO_NOTIFY_KAFKA_BROKERS_SECONDARY="https://kafka1.example.net:9200, https://kafka2.example.net:9200"

mc admin config set notify_kafka:primary \
   brokers="https://kafka1.example.net:9200, https://kafka2.example.net:9200"
   [ARGUMENT=VALUE ...]

mc admin config set notify_kafka:secondary \
   brokers="https://kafka1.example.net:9200, https://kafka2.example.net:9200"
   [ARGUMENT=VALUE ...]

Notice that for configuration settings, the unique identifier appends to notify_kafka only, not to each individual argument.

Settings

Enable

Required

MINIO_NOTIFY_KAFKA_ENABLE

Specify on to enable publishing bucket notifications to a Kafka service endpoint.

Defaults to off.

notify_kafka

The top-level configuration key for defining an Kafka service endpoint for use with MinIO bucket notifications.

Use mc admin config set to set or update an Kafka service endpoint. The brokers argument is required for each target. Specify additional optional arguments as a whitespace (" ")-delimited list.

mc admin config set notify_kafka \
  brokers="https://kafka1.example.net:9200, https://kafka2.example.net:9200"
  [ARGUMENT="VALUE"] ... \

Brokers

Required

MINIO_NOTIFY_KAFKA_BROKERS
notify_kafka brokers

Specify a comma-separated list of Kafka broker addresses. For example:

"kafka1.example.com:2021,kafka2.example.com:2021"

Changed in version RELEASE.2023-05-27T05-56-19Z: MinIO checks the health of the specified URL (if it is resolvable and reachable) prior to adding the target. MinIO no longer blocks adding new notification targets if existing targets are offline.

Topic

Optional

MINIO_NOTIFY_KAFKA_TOPIC
notify_kafka topic

Specify the name of the Kafka topic to which MinIO publishes bucket events.

SASL

Optional

MINIO_NOTIFY_KAFKA_SASL
notify_kafka sasl

Specify on to enable SASL authentication.

SASL Username

Optional

MINIO_NOTIFY_KAFKA_SASL_USERNAME
notify_kafka sasl_username

Specify the username for performing SASL/PLAIN or SASL/SCRAM authentication to the Kafka broker(s).

SASL Password

Optional

MINIO_NOTIFY_KAFKA_SASL_PASSWORD
notify_kafka sasl_password

Specify the password for performing SASL/PLAIN or SASL/SCRAM authentication to the Kafka broker(s).

Changed in version RELEASE.2023-06-23T20-26-00Z: MinIO redacts this value when returned as part of mc admin config get.

SASL Mechanism

Optional

MINIO_NOTIFY_KAFKA_SASL_MECHANISM
notify_kafka sasl_mechanism

Specify the SASL mechanism to use for authenticating to the Kafka broker(s). MinIO supports the following mechanisms:

  • PLAIN (Default)

  • SHA256

  • SHA512

TLS Client Auth

Optional

MINIO_NOTIFY_KAFKA_TLS_CLIENT_AUTH
notify_kafka tls_client_auth

Specify the client authentication type of the Kafka broker(s). The following table lists the supported values and their mappings

Value

Authentication Type

0

NoClientCert

1

RequestClientCert

2

RequireAnyClientCert

3

VerifyClientCertIfGiven

4

RequireAndVerifyClientCert

See ClientAuthType for more information on each client auth type.

TLS

Optional

MINIO_NOTIFY_KAFKA_TLS
notify_kafka tls

Specify on to enable TLS connectivity to the Kafka broker(s).

TLS Skip Verify

Optional

MINIO_NOTIFY_KAFKA_TLS_SKIP_VERIFY
notify_kafka tls_skip_verify

Enables or disables TLS verification of the NATS service endpoint TLS certificates.

  • Specify on to disable TLS verification (Default).

  • Specify off to enable TLS verification.

Client TLS Cert

Optional

MINIO_NOTIFY_KAFKA_CLIENT_TLS_CERT
notify_kafka client_tls_cert

Specify the path to the client certificate to use for performing mTLS authentication to the Kafka broker(s).

Client TLS Key

Optional

MINIO_NOTIFY_KAFKA_CLIENT_TLS_KEY
notify_kafka client_tls_key

Specify the path to the client private key to use for performing mTLS authentication to the Kafka broker(s).

Version

Optional

MINIO_NOTIFY_KAFKA_VERSION
notify_kafka version

Specify the version of the Kafka cluster to assume when performing operations against that cluster. See the sarama reference documentation for more information on this field’s behavior.

Batch Size

Optional

MINIO_NOTIFY_KAFKA_BATCH_SIZE
notify_kafka batch_size

Specify the integer value to use as the batch size for sending records to Kafka.

Changed in version RELEASE.2023-12-02T10-51-33Z: MinIO previously limited this value to 100.

Queue Directory

Optional

MINIO_NOTIFY_KAFKA_QUEUE_DIR
notify_kafka queue_dir

Specify the directory path to enable MinIO’s persistent event store for undelivered messages, such as /opt/minio/events.

MinIO stores undelivered events in the specified store while the Kafka server/broker is offline and replays the stored events when connectivity resumes.

Queue Limit

Optional

MINIO_NOTIFY_KAFKA_QUEUE_LIMIT
notify_kafka queue_limit

Specify the maximum limit for undelivered messages. Defaults to 100000.

Comment

Optional

MINIO_NOTIFY_KAFKA_COMMENT
notify_kafka comment

Specify a comment to associate with the Kafka configuration.

Compression Codec

New in version MinIO: Server RELEASE.2023-12-09T18-17-51Z

Optional

MINIO_NOTIFY_KAFKA_PRODUCER_COMPRESSION_CODEC
notify_kafka compression_codec

Specify the compression codec to use when sending records to Kafka.

Supports the following values:

  • none

  • snappy

  • gzip

  • lz4

  • zstd

Compression Level

New in version MinIO: Server RELEASE.2023-12-09T18-17-51Z

Optional

MINIO_NOTIFY_KAFKA_PRODUCER_COMPRESSION_LEVEL
notify_kafka compression_level

Controls the level of compression applied based on the configured compression codec.

Specify an integer value greater than or equal to 0. The effect of the value depends on the selected codec.

This work is licensed under a Creative Commons Attribution 4.0 International License. 2020-Present, MinIO, Inc. Creative Commons License