ResourceFunction Issues With Cluster Scoped Resources Despite `namespaced: False`

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Introduction

In this article, we will explore the issues that arise when using a ResourceFunction to generate a cluster-scoped resource, despite setting namespaced: false. We will delve into the problems that occur during unit testing and controller synchronization, and discuss potential workarounds and implications for workflows that rely on the output of resource creation.

Understanding ResourceFunction and Cluster Scoped Resources

A ResourceFunction is a Kubernetes resource that allows you to define a custom resource creation process. It provides a way to generate resources based on input parameters and predefined templates. Cluster-scoped resources, on the other hand, are resources that are not bound to a specific namespace and are accessible across the entire cluster.

The Problem with namespaced: false

When creating a cluster-scoped resource with a ResourceFunction, setting namespaced: false is expected to allow the resource to be created without a namespace. However, this does not seem to be the case when using a ResourceFunction. The unit tests fail, and the controller continuously attempts to sync the resource, leading to reconciliation issues.

Example Use Case: Creating a Kargo Project

Let's take a look at an example of creating a Kargo Project using a ResourceFunction. The Kargo Project is a cluster-scoped resource that does not require a namespace.

apiVersion: koreo.dev/v1beta1
kind: ResourceFunction
metadata:
  name: customservice-definition-kargo-project.v1
spec:
  apiConfig:
    apiVersion: kargo.akuity.io/v1alpha1
    kind: Project
    name: =inputs.name
    namespaced: false
  resource:
    spec: ~
---
apiVersion: koreo.dev/v1beta1
kind: FunctionTest
metadata:
  name: customservice-definition-kargo-project-test.v1
spec:
  functionRef:
    kind: ResourceFunction
    name: customservice-definition-kargo-project.v1
  inputs:
      name: test
  testCases:
    - label: renders Kargo Project from inputs
      expectResource:
        apiVersion: kargo.akuity.io/v1alpha1
        kind: Project
        metadata:
          name: test
        spec:
          description: "Kargo project for test"

Workaround: Adding namespace: ~ to expectedOutput

One way to silence the unit test failure is to add namespace: ~ to the expectedOutput section of the test case. However, this does not resolve the controller sync issue, and the workflow step will still show a warning.

Koreo UI Issues

The Koreo UI will display a warning and show reconciliation issues due to the missing namespace field. The instance view will also continuously show reconciliation issues.

Implications for Workflows

The issues with ResourceFunction and cluster-scoped resources can have significant implications for workflows that rely on the output of resource creation. If the workflow is unable to proceed due to reconciliation issues, it may lead to delays or failures in downstream steps.

Conclusion

In conclusion, using a ResourceFunction to a cluster-scoped resource with namespaced: false can lead to unit test failures and controller sync issues. While adding namespace: ~ to the expectedOutput section can silence the unit test failure, it does not resolve the underlying issue. Workflows that rely on the output of resource creation should be designed with these issues in mind to avoid delays or failures.

Potential Solutions

  1. Review CRD Requirements: Review the requirements of the CRD being used to ensure that it does not have any specific requirements for the resource field.
  2. Use a Different ResourceFunction: Consider using a different ResourceFunction that does not require a non-empty resource field.
  3. Modify the ResourceFunction: Modify the ResourceFunction to accommodate the specific requirements of the CRD being used.
  4. Implement a Workaround: Implement a workaround to silence the unit test failure and resolve the controller sync issue.

Future Development

The issues with ResourceFunction and cluster-scoped resources highlight the need for further development and refinement of the ResourceFunction API. Future development should focus on resolving these issues and providing a more robust and reliable way to generate resources.

References

Introduction

In our previous article, we explored the issues that arise when using a ResourceFunction to generate a cluster-scoped resource, despite setting namespaced: false. We discussed the problems that occur during unit testing and controller synchronization, and potential workarounds and implications for workflows that rely on the output of resource creation.

In this Q&A article, we will address some of the most frequently asked questions related to ResourceFunction issues with cluster-scoped resources.

Q: What is the cause of the unit test failure when using a ResourceFunction with a cluster-scoped resource?

A: The unit test failure is caused by the ResourceFunction's requirement for a non-empty resource field, which is not compatible with cluster-scoped resources that do not require a namespace.

Q: Why does adding namespace: ~ to the expectedOutput section silence the unit test failure, but not resolve the controller sync issue?

A: Adding namespace: ~ to the expectedOutput section silences the unit test failure because it tells the test to expect a namespace, even though the resource does not have one. However, this does not resolve the controller sync issue because the controller is still trying to reconcile the resource with a namespace, which is not present.

Q: What are the implications of these issues for workflows that rely on the output of resource creation?

A: The issues with ResourceFunction and cluster-scoped resources can have significant implications for workflows that rely on the output of resource creation. If the workflow is unable to proceed due to reconciliation issues, it may lead to delays or failures in downstream steps.

Q: Are there any potential solutions to these issues?

A: Yes, there are several potential solutions to these issues, including:

  • Reviewing the requirements of the CRD being used to ensure that it does not have any specific requirements for the resource field.
  • Using a different ResourceFunction that does not require a non-empty resource field.
  • Modifying the ResourceFunction to accommodate the specific requirements of the CRD being used.
  • Implementing a workaround to silence the unit test failure and resolve the controller sync issue.

Q: What is the current status of the ResourceFunction API, and are there any plans to address these issues?

A: The ResourceFunction API is currently under development, and the issues with cluster-scoped resources are being addressed. Future development will focus on resolving these issues and providing a more robust and reliable way to generate resources.

Q: How can I get involved in the development of the ResourceFunction API and help address these issues?

A: You can get involved in the development of the ResourceFunction API by contributing to the Koreo project on GitHub. You can also participate in the Koreo community by joining the discussion forum and providing feedback on the ResourceFunction API.

Q: What are some best practices for using the ResourceFunction API and avoiding these issues?

A: Some best practices for using the ResourceFunction API avoiding these issues include:

  • Reviewing the requirements of the CRD being used to ensure that it does not have any specific requirements for the resource field.
  • Using a different ResourceFunction that does not require a non-empty resource field.
  • Modifying the ResourceFunction to accommodate the specific requirements of the CRD being used.
  • Implementing a workaround to silence the unit test failure and resolve the controller sync issue.

Conclusion

In conclusion, the issues with ResourceFunction and cluster-scoped resources are complex and multifaceted. By understanding the causes of these issues and exploring potential solutions, you can better navigate the challenges of using the ResourceFunction API and ensure the success of your workflows.

References