Files
kustomize/functions/examples/validator-resource-requests
dependabot[bot] cba85e8c30 build(deps): bump github.com/go-errors/errors from 1.4.2 to 1.5.1
Bumps [github.com/go-errors/errors](https://github.com/go-errors/errors) from 1.4.2 to 1.5.1.
- [Release notes](https://github.com/go-errors/errors/releases)
- [Commits](https://github.com/go-errors/errors/compare/v1.4.2...v1.5.1)

---
updated-dependencies:
- dependency-name: github.com/go-errors/errors
  dependency-version: 1.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
2026-09-04 01:57:37 +00:00
..

Validation

This is an example of implementing a validation function.

This example is written in go and uses the kyaml libraries for parsing the input and writing the output. Writing in go is not a requirement.

Function implementation

The function is implemented as an image, and built using make image.

The template is implemented as a go program, which reads a collection of input Resource configuration, and looks for invalid configuration.

Function invocation

The function is invoked by authoring a local Resource with metadata.annotations.[config.kubernetes.io/function] and running:

kustomize fn run local-resource/

This exists non-zero if there is an error.

Running the Example

Run the validator with:

kustomize fn run local-resource/

This will return an error:

cpu-requests missing for container nginx

Now uncomment the resource reservations and run again:

kustomize fn run local-resource/

This will return success