set-image: Advanced Example #

Overview #

This example demonstrates how to declaratively run set-image function to set the image for the .spec.containers[].image field on all resources.

We use the following Kptfile and fn-config.yaml to configure the function.

apiVersion: kpt.dev/v1
kind: Kptfile
metadata:
  name: example
pipeline:
  mutators:
    - image: ghcr.io/kptdev/krm-functions-catalog/set-image:latest
      configPath: fn-config.yaml

# fn-config.yaml
apiVersion: fn.kpt.dev/v1alpha1
kind: SetImage
metadata:
  name: my-func-config
image:
  name: nginx
  newName: bitnami/nginx
  newTag: 1.21.4
additionalImageFields:
- kind: MyKind
  create: false
  group: dev.example.com
  path: spec/manifest/images[]/image
  version: v1

The desired image is provided using the image field. We have a CRD with group dev.example.com, version v1 and kind MyKind. We want the image to be set for the field .spec.manifest.images[].image as well. We specify it in field additionalImageFields.

Function invocation #

Invoke the function by running the following commands:

$ kpt pkg get https://github.com/kptdev/krm-functions-catalog/tree/master/examples/set-image-advanced
$ kpt fn render set-image-advanced

Expected result #

Check that the image nginx has been set to bitnami/nginx:1.21.4 in the standard .spec.containers[].image field of the resource of kind Pod. And the image nginx has been set to bitnami/nginx:1.21.4 in the custom .spec.manifest.images[].image location of the resource of kind MyKind