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Chapter 33. Kafka Sink

Send data to Kafka topics.

The Kamelet is able to understand the following headers to be set:

  • key / ce-key: as message key
  • partition-key / ce-partitionkey: as message partition key

Both the headers are optional.

33.1. Configuration Options
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The following table summarizes the configuration options available for the kafka-sink Kamelet:

Expand
PropertyNameDescriptionTypeDefaultExample

bootstrapServers *

Brokers

Comma separated list of Kafka Broker URLs

string

  

password *

Password

Password to authenticate to kafka

string

  

topic *

Topic Names

Comma separated list of Kafka topic names

string

  

user *

Username

Username to authenticate to Kafka

string

  

saslMechanism

SASL Mechanism

The Simple Authentication and Security Layer (SASL) Mechanism used.

string

"PLAIN"

 

securityProtocol

Security Protocol

Protocol used to communicate with brokers. SASL_PLAINTEXT, PLAINTEXT, SASL_SSL and SSL are supported

string

"SASL_SSL"

 
Note

Fields marked with an asterisk (*) are mandatory.

33.2. Dependencies
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At runtime, the `kafka-sink Kamelet relies upon the presence of the following dependencies:

  • camel:kafka
  • camel:kamelet

33.3. Usage
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This section describes how you can use the kafka-sink.

33.3.1. Knative Sink
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You can use the kafka-sink Kamelet as a Knative sink by binding it to a Knative object.

kafka-sink-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: kafka-sink-binding
spec:
  source:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel
  sink:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: kafka-sink
    properties:
      bootstrapServers: "The Brokers"
      password: "The Password"
      topic: "The Topic Names"
      user: "The Username"
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33.3.1.1. Prerequisite
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Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

33.3.1.2. Procedure for using the cluster CLI
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  1. Save the kafka-sink-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the sink by using the following command: 

    oc apply -f kafka-sink-binding.yaml
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33.3.1.3. Procedure for using the Kamel CLI
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Configure and run the sink by using the following command: 

kamel bind channel:mychannel kafka-sink -p "sink.bootstrapServers=The Brokers" -p "sink.password=The Password" -p "sink.topic=The Topic Names" -p "sink.user=The Username"
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This command creates the KameletBinding in the current namespace on the cluster.

33.3.2. Kafka Sink
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You can use the kafka-sink Kamelet as a Kafka sink by binding it to a Kafka topic.

kafka-sink-binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: kafka-sink-binding
spec:
  source:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic
  sink:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: kafka-sink
    properties:
      bootstrapServers: "The Brokers"
      password: "The Password"
      topic: "The Topic Names"
      user: "The Username"
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33.3.2.1. Prerequisites
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Ensure that you’ve installed the AMQ Streams operator in your OpenShift cluster and created a topic named my-topic in the current namespace. Make also sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

33.3.2.2. Procedure for using the cluster CLI
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  1. Save the kafka-sink-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the sink by using the following command: 

    oc apply -f kafka-sink-binding.yaml
    Copy to Clipboard Toggle word wrap

33.3.2.3. Procedure for using the Kamel CLI
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Configure and run the sink by using the following command: 

kamel bind kafka.strimzi.io/v1beta1:KafkaTopic:my-topic kafka-sink -p "sink.bootstrapServers=The Brokers" -p "sink.password=The Password" -p "sink.topic=The Topic Names" -p "sink.user=The Username"
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This command creates the KameletBinding in the current namespace on the cluster.

33.4. Kamelet source file
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https://github.com/openshift-integration/kamelet-catalog/blob/kamelet-catalog-1.6/kafka-sink.kamelet.yaml

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