How can I patch the podinfo kustomization of the Get Started example?

[knweiss]

I've created the podinfo kustomization following the Flux v2 Get Started example. It applies the three manifests from the upstream podinfo GitRepository directory./kustomize.

As a first test I then wanted to increase the MinReplicas of the upstream HorizontalPodAutoscaler definition from 2 to 3 by adding an overlay to the kustomization.

Now I'm wondering: What's best way to patch/overlay the upstream manifests using kustomize's patchesMergeStrategic feature?

Would I place my own patch.yaml in a new GitRepository (I can't modify the upstream podinfo repo directly). But how can I then reference podinfo's ./kustomize directory as a kustomize base? Is this even possible? Or do I have to copy the upstream manifests into my own repository?

[somtochiama]

Hey @knweiss,
You can add the patch in the patchesMergeStrategic field in the Kustomization.
E.g

apiVersion: kustomize.toolkit.fluxcd.io/v1beta1
kind: Kustomization
metadata:
  name: podinfo
  namespace: flux-system
spec:
  interval: 5m0s
  path: ./kustomize
  prune: true
  sourceRef:
    kind: GitRepository
    name: podinfo
  validation: client
  patchesStrategicMerge:
  - apiVersion: autoscaling/v2beta2
    kind: HorizontalPodAutoscaler
    metadata:
      name: podinfo
    spec:
      minReplicas: 3

[knweiss]

Thank you, this works! 👍

[stefanprodan]

Docs here: https://toolkit.fluxcd.io/components/kustomize/kustomization/#override-kustomize-config