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Showing content from https://github.com/strimzi/kafka-access-operator below:

strimzi/kafka-access-operator: Operator for sharing access to Strimzi clusters across namespaces

This project provides a Kubernetes operator to help applications bind to an Apache Kafka® cluster that is managed by the Strimzi cluster operator.

The operator creates a single Kubernetes Secret resource containing all the connection details for the Kafka cluster. This removes the need for applications to query multiple Kubernetes resources to get connection information. The Secret follows the conventions laid out in the Service Binding Specification for Kubernetes v1.0.0.

The operator is built using the Java Operator SDK.

The latest release of the Access Operator can be deployed using the manifests in the install directory. The dev guide describes how to build and run the Access Operator from source.

For the operator to start successfully, you need the Strimzi Kafka and KafkaUser custom resource definitions installed in your Kubernetes cluster. You can get these from the Strimzi GitHub repository, or use the Strimzi quickstart guide to also deploy the Strimzi cluster operator and a Kafka instance at the same time.

To deploy the Access Operator in the strimzi-access-operator namespace:

The command deploys the Strimzi Access Operator on the Kubernetes cluster.

To delete the strimzi-access-operator deployment:

kubectl delete -f install

This command removes all Kubernetes components associated with the Strimzi Access Operator and deletes the deployment.

To make use of the Access Operator, create a KafkaAccess custom resource (CR). You must specify the name of the Kafka CR you want to connect to. You can optionally also specify the name of the listener in the Kafka CR and a KafkaUser. See the examples folder for some valid KafkaAccess specifications.

If you do not specify which listener you want to connect to, the operator uses the following rules to choose a listener:

1. If there is only one listener configured in the Kafka CR, that listener is chosen.
2. If there are multiple listeners listed in the Kafka CR, the operator filters the list by comparing the tls and authentication properties in the Kafka and KafkaUser CRs to select a listener with the appropriate security.
3. If there are multiple listeners with appropriate security, the operator chooses the one that is of type internal.
4. If there are multiple internal listeners with appropriate security, the operator sorts the listeners alphabetically by name, and chooses the first one.

Once the Access Operator has created the binding Secret, it updates the KafkaAccess custom resource to put the name of the secret in the status, for example:

...
status:
  binding:
    name: kafka-binding

The Secret created by the Access Operator has the following structure:

apiVersion: v1
kind: Secret
metadata:
    name: kafka-binding
type: servicebinding.io/kafka
data:
    type: kafka
    provider: strimzi

    bootstrap.servers: # comma separated list of host:port for Kafka
    bootstrap-servers: # comma separated list of host:port for Kafka
    bootstrapServers: # comma separated list of host:port for Kafka

    security.protocol: # one of PLAINTEXT, SASL_PLAINTEXT, SASL_SSL or SSL
    securityProtocol: # one of PLAINTEXT, SASL_PLAINTEXT, SASL_SSL or SSL

    # Provided if TLS enabled:
    ssl.truststore.crt: #  Strimzi cluster CA certificate

    # Provided if selected user is SCRAM auth:
    username: # SCRAM username
    password: # SCRAM password
    sasl.jaas.config: # sasl jaas config string for use by Java applications
    sasl.mechanism: SCRAM-SHA-512
    saslMechanism: SCRAM-SHA-512

    # Provided if selected user is mTLS:
    ssl.keystore.crt: # certificate for the consuming client signed by the clients' CA
    ssl.keystore.key: # private key for the consuming client

Developers can make this Secret available to their applications themselves, or use an operator that implements the Service Binding specification to do it.

If you encounter any issues while using the Access Operator, you can get help through the following methods:

• Strimzi Users mailing list
• #strimzi channel on CNCF Slack
• GitHub Discussions

You can contribute by:

• Raising any issues you find using the Access Operator
• Fixing issues by opening Pull Requests
• Improving documentation
• Talking about the Strimzi Access Operator

All bugs, tasks or enhancements are tracked as GitHub issues.

The dev guide describes how to build the operator and how to test your changes before submitting a patch or opening a PR.

If you want to get in touch with us first before contributing, you can use:

• Strimzi Dev mailing list
• #strimzi channel on CNCF Slack

Learn more on how you can contribute on our Join Us page.

Strimzi Access Operator is licensed under the Apache License, Version 2.0

Strimzi Access Operator containers are signed using the cosign tool. Strimzi currently does not use the keyless signing and the transparency log. To verify the authenticity of the container, you can copy the following Strimzi public key into a file:

-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAET3OleLR7h0JqatY2KkECXhA9ZAkC
TRnbE23Wb5AzJPnpevvQ1QUEQQ5h/I4GobB7/jkGfqYkt6Ct5WOU2cc6HQ==
-----END PUBLIC KEY-----

Use the following cosign command to verify the signature:

cosign verify --key strimzi.pub quay.io/strimzi/kafka-access-operator:latest --insecure-ignore-tlog=true

Strimzi Access Operator publishes the software bill of materials (SBOM) of our containers. The SBOMs are published as archives with SPDX-JSON and Syft-Table formats, and they are signed using cosign. For releases, they are also pushed into the container registry. To verify the authenticity of the SBOM signatures, use the Strimzi public key:

-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAET3OleLR7h0JqatY2KkECXhA9ZAkC
TRnbE23Wb5AzJPnpevvQ1QUEQQ5h/I4GobB7/jkGfqYkt6Ct5WOU2cc6HQ==
-----END PUBLIC KEY-----

Use the following cosign command to verify the signatures:

cosign verify-blob --key cosign.pub --bundle <SBOM-file>.bundle --insecure-ignore-tlog=true <SBOM-file>

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