Manage Kafka Cluster Configuration Settings in Confluent Cloud

This topic describes the default Apache Kafka® cluster configuration settings in Confluent Cloud. For a complete description of all Kafka configurations, see Confluent Platform Configuration Reference.

When editing cluster settings, remember the following:

Access cluster settings in the Confluent Cloud Console

You can access settings for your clusters with the Cloud Console.

To do so:

  1. Sign in to your Confluent account.

  2. Select an environment and choose a cluster.

  3. In the navigation menu, select Cluster Overview > Cluster settings and the Cluster settings page displays.

    Confluent Cluster settings

Note

You may also see Networking and Security tabs depending on the type of cluster and how it is configured.

Change cluster settings for Dedicated clusters

The following table lists editable cluster settings for Dedicated clusters and their default parameter values.

Parameter Name Default Editable More Info
auto.create.topics.enable false Yes  
ssl.cipher.suites “” Yes  
num.partitions 6 Yes Limits vary, see: Kafka Cluster Types in Confluent Cloud
log.cleaner.max.compaction.lag.ms 9223372036854775807 Yes Min: 21600000 ms
log.retention.ms 604800000 Yes Set to -1 for Infinite Storage

To modify these settings, use the CLI or the Kafka REST APIs. For more information, see Get Started with Confluent CLI or Kafka REST API Quick Start for Confluent Cloud Developers.

Changes to the settings are applied to your Confluent Cloud cluster without additional action on your part and are persistent until the setting is explicitly changed again.

Important

These settings apply only to Dedicated clusters and cannot be modified on Basic, Standard, and Enterprise clusters.

Enable automatic topic creation

Automatic topic creation (auto.create.topics.enable) is disabled (false) by default to help prevent unexpected costs. The following commands show how to enable it. For more on this property, see broker configurations.

confluent kafka cluster configuration update --config auto.create.topics.enable=true

Restrict cipher suites

The following commands show how to restrict the allowed TLS/SSL cipher suites (ssl.cipher.suites). For more on this property, see broker configurations.

confluent kafka cluster configuration update --config ssl.cipher.suites=["list-item-1,list-item-2"]

The valid list of ciphers includes:

TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256

Change the default number of partitions for new topics

The following commands show how to set the default number of partitions (num.partitions) for newly created topics. On clusters, num.partitions allows you set a default for newly created topics. On topics, num.partitions allows you to specify the number of partitions for a particular topic. For more information, see topic configurations and confluent kafka cluster configuration update.

confluent kafka cluster configuration update --config num.partitions=<n>

Change maximum compaction lag time

The following commands show how to set the default maximum lag compaction time (log.cleaner.max.compaction.lag.ms) for new topics. For more on this property, see max.compaction.lag.ms.

confluent kafka cluster configuration update --config log.cleaner.max.compaction.lag.ms=<int>

Change log retention time

The following commands show how to set the default log retention time (log.retention.ms) for new topics. For more on this property, see retention.ms.

confluent kafka cluster configuration update --config log.retention.ms=<int>

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