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Contributing guidelines

This document describes how to contribute to the project.

Sign the CLA

Kubernetes projects require that you sign a Contributor License Agreement (CLA) before we can accept your pull requests.

Please see for more info.


  • go version v1.20+.
  • docker version 17.03+.
  • kubectl version v1.11.3+.
  • kustomize v3.1.0+
  • Access to a Kubernetes v1.11.3+ cluster.

Contributing steps

  1. Submit an issue describing your proposed change to the repo in question.
  2. The repo owners will respond to your issue promptly.
  3. If your proposed change is accepted, and you haven't already done so, sign a Contributor License Agreement (see details above).
  4. Fork the desired repo, develop and test your code changes.
  5. Submit a pull request.

How to build kubebuilder locally

Note that, by building the kubebuilder from the source code we are allowed to test the changes made locally.

  1. Run the following command to clone your fork of the project locally in the dir /src/
$ git clone<user>/kubebuilder.git $GOPATH/src/
  1. Ensure you activate module support before continue ($ export GO111MODULE=on)
  2. Run the command make install to create a bin with the source code

NOTE In order to check the local environment run make test-unit.

What to do before submitting a pull request

  1. Run the script make generate to update/generate the mock data used in the e2e test in $GOPATH/src/
  2. Run make test-unit test-e2e-local
  • e2e tests use kind and setup-envtest. If you want to bring your own binaries, place them in $(go env GOPATH)/bin.

IMPORTANT: The make generate is very helpful. By using it, you can check if good part of the commands still working successfully after the changes. Also, note that its usage is a pre-requirement to submit a PR.

Following the targets that can be used to test your changes locally.

Command Description Is called in the CI?
make test-unit Runs go tests no
make test Runs tests in shell (./ yes
make lint Run golangci lint checks yes
make lint-fix Run golangci to automatically perform fixes no
make test-coverage Run coveralls to check the % of code covered by tests yes
make check-testdata Checks if the testdata dir is updated with the latest changes yes
make test-e2e-local Runs the CI e2e tests locally no

NOTE To use the make lint is required to install golangci-lint locally. More info:

Test Plugin

If your intended PR creates a new plugin, make sure the PR also provides test cases. Testing should include:

  1. e2e tests to validate the behavior of the proposed plugin.
  2. sample projects to verify the scaffolded output from the plugin.

1. Plugin E2E Tests

All the plugins provided by Kubebuilder should be validated through e2e-tests across multiple platforms.

Current Kubebuilder provides the testing framework that includes testing code based on ginkgo, Github Actions for unit tests, and multiple env tests driven by test-infra.

To fully test the proposed plugin:

  1. Create a new package(folder) under test/e2e/<your-plugin>.

  2. Create e2e_suite_test.go, which imports the necessary testing framework.

  3. Create generate_test.go (ref). That should:

  4. Create plugin_cluster_test.go (ref). That should:

    • 4.1. Setup testing environment, e.g:

    • 4.2. Run the function from generate_test.go.

    • 4.3. Further make sure the scaffolded output works, e.g:

    • 4.4. Delete temporary resources after testing exited, e.g:

  5. Add the command in test/e2e/plugin to run your testing code:

go test $(dirname "$0")/<your-plugin-test-folder> $flags -timeout 30m

2. Sample Projects from the Plugin

It is also necessary to test consistency of the proposed plugin across different env and the integration with other plugins.

This is performed by generating sample projects based on the plugins. The CI workflow defined in Github Action would validate the availability and the consistency.


PR Process

See for a full description. TL;DR:

Every PR should be annotated with an icon indicating whether it's a:

  • Breaking change: ⚠️ (:warning:)
  • Non-breaking feature: (:sparkles:)
  • Patch fix: 🐛 (:bug:)
  • Docs: 📖 (:book:)
  • Infra/Tests/Other: 🌱 (:seedling:)
  • No release note: 👻 (:ghost:)

Use 👻 (no release note) only for the PRs that change or revert unreleased changes, which don't deserve a release note. Please don't abuse it.

You can also use the equivalent emoji directly, since GitHub doesn't render the :xyz: aliases in PR titles.

If the PR is "plugin" scoped, you may also append the responding plugin names in the prefix. For instance:

🐛 (kustomize/v2-alpha): Fix typo issue in the labels added to the manifests

Individual commits should not be tagged separately, but will generally be assumed to match the PR. For instance, if you have a bugfix in with a breaking change, it's generally encouraged to submit the bugfix separately, but if you must put them in one PR, mark the commit separately.

Where the CI Tests are configured

  1. See the action files to check its tests, and the scripts used on it.
  2. Note that the prow tests used in the CI are configured in kubernetes-sigs/kubebuilder/kubebuilder-presubmits.yaml.
  3. Check that all scripts used by the CI are defined in the project.
  4. Notice that our policy to test the project is to run against k8s version N-2. So that the old version should be removed when there is a new k8s version available.

How to contribute to docs

The docs are published off of three branches:

See for more information.

There are certain writing style guidelines for Kubernetes documentation, checkout style guide for more information.

How to preview the changes performed in the docs

Check the CI job after to do the Pull Request and then, click on in the Details of netlify/kubebuilder/deploy-preview

Community, discussion and support

Learn how to engage with the Kubernetes community on the community page.

You can reach the maintainers of this project at:

Becoming a reviewer or approver

Contributors may eventually become official reviewers or approvers in Kubebuilder and the related repositories. See for more information.

Code of conduct

Participation in the Kubernetes community is governed by the Kubernetes Code of Conduct.