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Chapter 49. ZookeeperClusterSpec schema reference

Used in: KafkaSpec

Full list of ZookeeperClusterSpec schema properties

Configures a ZooKeeper cluster.

The config properties are one part of the overall configuration for the resource. Use the config properties to configure ZooKeeper options as keys.

Example ZooKeeper configuration

apiVersion: kafka.strimzi.io/v1beta2
kind: Kafka
spec:
  kafka:
    # ...
  zookeeper:
    # ...
    config:
      autopurge.snapRetainCount: 3
      autopurge.purgeInterval: 2
    # ...
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The values can be one of the following JSON types:

  • String
  • Number
  • Boolean

Exceptions

You can specify and configure the options listed in the ZooKeeper documentation.

However, Streams for Apache Kafka takes care of configuring and managing options related to the following, which cannot be changed:

  • Security (encryption, authentication, and authorization)
  • Listener configuration
  • Configuration of data directories
  • ZooKeeper cluster composition

Properties with the following prefixes cannot be set:

  • 4lw.commands.whitelist
  • authProvider
  • clientPort
  • dataDir
  • dataLogDir
  • quorum.auth
  • reconfigEnabled
  • requireClientAuthScheme
  • secureClientPort
  • server.
  • snapshot.trust.empty
  • standaloneEnabled
  • serverCnxnFactory
  • ssl.
  • sslQuorum

If the config property contains an option that cannot be changed, it is disregarded, and a warning message is logged to the Cluster Operator log file. All other supported options are forwarded to ZooKeeper, including the following exceptions to the options configured by Streams for Apache Kafka:

49.1. Logging
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ZooKeeper has a configurable logger:

  • zookeeper.root.logger

ZooKeeper uses the Apache log4j logger implementation.

Use the logging property to configure loggers and logger levels.

You can set the log levels by specifying the logger and level directly (inline) or use a custom (external) ConfigMap. If a ConfigMap is used, you set logging.valueFrom.configMapKeyRef.name property to the name of the ConfigMap containing the external logging configuration. Inside the ConfigMap, the logging configuration is described using log4j.properties. Both logging.valueFrom.configMapKeyRef.name and logging.valueFrom.configMapKeyRef.key properties are mandatory. A ConfigMap using the exact logging configuration specified is created with the custom resource when the Cluster Operator is running, then recreated after each reconciliation. If you do not specify a custom ConfigMap, default logging settings are used. If a specific logger value is not set, upper-level logger settings are inherited for that logger. For more information about log levels, see Apache logging services.

Here we see examples of inline and external logging. The inline logging specifies the root logger level. You can also set log levels for specific classes or loggers by adding them to the loggers property.

Inline logging

apiVersion: kafka.strimzi.io/v1beta2
kind: Kafka
spec:
  # ...
  zookeeper:
    # ...
    logging:
      type: inline
      loggers:
        zookeeper.root.logger: INFO
        log4j.logger.org.apache.zookeeper.server.FinalRequestProcessor: TRACE
        log4j.logger.org.apache.zookeeper.server.ZooKeeperServer: DEBUG
    # ...
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Note

Setting a log level to DEBUG may result in a large amount of log output and may have performance implications.

External logging

apiVersion: kafka.strimzi.io/v1beta2
kind: Kafka
spec:
  # ...
  zookeeper:
    # ...
    logging:
      type: external
      valueFrom:
        configMapKeyRef:
          name: customConfigMap
          key: zookeeper-log4j.properties
  # ...
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Garbage collector (GC)

Garbage collector logging can also be enabled (or disabled) using the jvmOptions property.

49.2. ZookeeperClusterSpec schema properties
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Expand
PropertyProperty typeDescription

replicas

integer

The number of pods in the cluster.

image

string

The container image used for ZooKeeper pods. If no image name is explicitly specified, it is determined based on the Kafka version set in spec.kafka.version. The image names are specifically mapped to corresponding versions in the Cluster Operator configuration.

storage

EphemeralStorage, PersistentClaimStorage

Storage configuration (disk). Cannot be updated.

config

map

The ZooKeeper broker config. Properties with the following prefixes cannot be set: server., dataDir, dataLogDir, clientPort, authProvider, quorum.auth, requireClientAuthScheme, snapshot.trust.empty, standaloneEnabled, reconfigEnabled, 4lw.commands.whitelist, secureClientPort, ssl., serverCnxnFactory, sslQuorum (with the exception of: ssl.protocol, ssl.quorum.protocol, ssl.enabledProtocols, ssl.quorum.enabledProtocols, ssl.ciphersuites, ssl.quorum.ciphersuites, ssl.hostnameVerification, ssl.quorum.hostnameVerification).

livenessProbe

Probe

Pod liveness checking.

readinessProbe

Probe

Pod readiness checking.

jvmOptions

JvmOptions

JVM Options for pods.

jmxOptions

KafkaJmxOptions

JMX Options for Zookeeper nodes.

resources

ResourceRequirements

CPU and memory resources to reserve.

metricsConfig

JmxPrometheusExporterMetrics

Metrics configuration.

logging

InlineLogging, ExternalLogging

Logging configuration for ZooKeeper.

template

ZookeeperClusterTemplate

Template for ZooKeeper cluster resources. The template allows users to specify how the OpenShift resources are generated.

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