Chapter 3. Creating a container image from the Kafka Connect base image


An alternative to using Kafka Connect S2I is to build your own CDC image using Docker. You can use the Kafka container image on Red Hat Container Catalog as a base image for creating your own custom image with additional connector plugins.

The following procedure explains how to create your custom image and add it to the /opt/kafka/plugins directory. At startup, the Debezium version of Kafka Connect loads any third-party connector plug-ins contained in the /opt/kafka/plugins directory.

Prerequisites

  • AMQ Streams Cluster Operator is deployed

Procedure

  1. Create a new Dockerfile using registry.redhat.io/amq7/amq-streams-kafka-24:1.4.0 as the base image:

    FROM registry.redhat.io/amq7/amq-streams-kafka-24:1.4.0
    USER root:root
    COPY ./my-plugins/ /opt/kafka/plugins/
    USER 1001
  2. Build the container image.

    docker build -t my-new-container-image:latest
  3. Push your custom image to your container registry.

    docker push my-new-container-image:latest
  4. Point to the new container image.

    You can either:

    • Edit the KafkaConnect.spec.image property of the KafkaConnect custom resource.

      If set, this property overrides the STRIMZI_DEFAULT_KAFKA_CONNECT_IMAGE variable in the Cluster Operator.

      apiVersion: kafka.strimzi.io/v1beta1
      kind: KafkaConnect
      metadata:
        name: my-connect-cluster
      spec:
        #...
        image: my-new-container-image

      or

    • In the install/cluster-operator/050-Deployment-strimzi-cluster-operator.yaml file, edit the STRIMZI_DEFAULT_KAFKA_CONNECT_IMAGE variable to point to the new container image and reinstall the Cluster Operator. If you edit this file you will need to apply it to your OpenShift cluster.

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