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Chapter 6. Preparing for your Streams for Apache Kafka deployment
Prepare for a deployment of Streams for Apache Kafka by completing any necessary pre-deployment tasks. Take the necessary preparatory steps according to your specific requirements, such as the following:
- Ensuring you have the necessary prerequisites before deploying Streams for Apache Kafka
- Considering operator deployment best practices
- Pushing the Streams for Apache Kafka container images into your own registry (if required)
- Creating a pull secret for authentication to the container image registry
- Setting up admin roles to enable configuration of custom resources used in the deployment
To run the commands in this guide, your cluster user must have the rights to manage role-based access control (RBAC) and CRDs.
6.1. Deployment prerequisites
To deploy Streams for Apache Kafka, you will need the following:
An OpenShift 4.14 and later cluster.
Streams for Apache Kafka is based on Strimzi 0.45.x.
-
The
occommand-line tool is installed and configured to connect to the running cluster.
6.2. Operator deployment best practices
Potential issues can arise from installing more than one Streams for Apache Kafka operator in the same OpenShift cluster, especially when using different versions. Each Streams for Apache Kafka operator manages a set of resources in an OpenShift cluster. When you install multiple Streams for Apache Kafka operators, they may attempt to manage the same resources concurrently. This can lead to conflicts and unpredictable behavior within your cluster. Conflicts can still occur even if you deploy Streams for Apache Kafka operators in different namespaces within the same OpenShift cluster. Although namespaces provide some degree of resource isolation, certain resources managed by the Streams for Apache Kafka operator, such as Custom Resource Definitions (CRDs) and roles, have a cluster-wide scope.
Additionally, installing multiple operators with different versions can result in compatibility issues between the operators and the Kafka clusters they manage. Different versions of Streams for Apache Kafka operators may introduce changes, bug fixes, or improvements that are not backward-compatible.
To avoid the issues associated with installing multiple Streams for Apache Kafka operators in an OpenShift cluster, the following guidelines are recommended:
- Install the Streams for Apache Kafka operator in a separate namespace from the Kafka cluster and other Kafka components it manages, to ensure clear separation of resources and configurations.
- Use a single Streams for Apache Kafka operator to manage all your Kafka instances within an OpenShift cluster.
- Update the Streams for Apache Kafka operator and the supported Kafka version as often as possible to reflect the latest features and enhancements.
By following these best practices and ensuring consistent updates for a single Streams for Apache Kafka operator, you can enhance the stability of managing Kafka instances in an OpenShift cluster. This approach also enables you to make the most of Streams for Apache Kafka’s latest features and capabilities.
As Streams for Apache Kafka is based on Strimzi, the same issues can also arise when combining Streams for Apache Kafka operators with Strimzi operators in an OpenShift cluster.
6.3. Pushing container images to your own registry
Container images for Streams for Apache Kafka are available in the Red Hat Ecosystem Catalog. The installation YAML files provided by Streams for Apache Kafka will pull the images directly from the Red Hat Ecosystem Catalog.
If you do not have access to the Red Hat Ecosystem Catalog or want to use your own container repository, do the following:
- Pull all container images listed here
- Push them into your own registry
- Update the image names in the installation YAML files
Each Kafka version supported for the release has a separate image.
| Container image | Namespace/Repository | Description |
|---|---|---|
| Kafka |
| Images for running Kafka, including:
|
| Operator |
| Image for running the operators:
|
| Kafka Bridge |
| Image for running the Streams for Apache Kafka Bridge |
| Streams for Apache Kafka Drain Cleaner |
| Image for running the Streams for Apache Kafka Drain Cleaner |
| Streams for Apache Kafka Proxy |
| Image for running the Streams for Apache Kafka Proxy |
| Streams for Apache Kafka Console |
| Images for running the Streams for Apache Kafka Console |
The installation YAML files provided by Streams for Apache Kafka pull container images directly from the Red Hat Ecosystem Catalog. If a Streams for Apache Kafka deployment requires authentication, configure authentication credentials in a secret and add it to the installation YAML.
Authentication is not usually required, but might be requested on certain platforms.
Prerequisites
- You need your Red Hat username and password or the login details from your Red Hat registry service account.
You can use your Red Hat subscription to create a registry service account from the Red Hat Customer Portal.
Procedure
Create a pull secret containing your login details and the container registry where the Streams for Apache Kafka image is pulled from:
oc create secret docker-registry <pull_secret_name> \ --docker-server=registry.redhat.io \ --docker-username=<user_name> \ --docker-password=<password> \ --docker-email=<email>Add your user name and password. The email address is optional.
Edit the
install/cluster-operator/060-Deployment-strimzi-cluster-operator.yamldeployment file to specify the pull secret using theSTRIMZI_IMAGE_PULL_SECRETSenvironment variable:apiVersion: apps/v1 kind: Deployment metadata: name: strimzi-cluster-operator spec: # ... template: spec: serviceAccountName: strimzi-cluster-operator containers: # ... env: - name: STRIMZI_IMAGE_PULL_SECRETS value: "<pull_secret_name>" # ...The secret applies to all pods created by the Cluster Operator.
6.5. Designating Streams for Apache Kafka administrators
Streams for Apache Kafka provides custom resources for configuration of your deployment. By default, permission to view, create, edit, and delete these resources is limited to OpenShift cluster administrators. Streams for Apache Kafka provides two cluster roles that you can use to assign these rights to other users:
-
strimzi-viewallows users to view and list Streams for Apache Kafka resources. -
strimzi-adminallows users to also create, edit or delete Streams for Apache Kafka resources.
When you install these roles, they will automatically aggregate (add) these rights to the default OpenShift cluster roles. strimzi-view aggregates to the view role, and strimzi-admin aggregates to the edit and admin roles. Because of the aggregation, you might not need to assign these roles to users who already have similar rights.
The following procedure shows how to assign a strimzi-admin role that allows non-cluster administrators to manage Streams for Apache Kafka resources.
A system administrator can designate Streams for Apache Kafka administrators after the Cluster Operator is deployed.
Prerequisites
- The Streams for Apache Kafka admin deployment files, which are included in the Streams for Apache Kafka deployment files.
- The Streams for Apache Kafka Custom Resource Definitions (CRDs) and role-based access control (RBAC) resources to manage the CRDs have been deployed with the Cluster Operator.
Procedure
Create the
strimzi-viewandstrimzi-admincluster roles in OpenShift.oc create -f install/strimzi-adminIf needed, assign the roles that provide access rights to users that require them.
oc create clusterrolebinding strimzi-admin --clusterrole=strimzi-admin --user=user1 --user=user2
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