Kustomize patching multiple path with same value

Question

I am trying to see if there are other ways to run patches with multiple paths with the same value.

This is an example of my Kustomization where I am replacing it with the same value. Is there a way to have a variable that I can use to refer to replace it instead of typing the same value multiple times?

patches: 
  - target:
      group: apps
      version: v1
      kind: Deployment
      name: common-base
    patch: |-
      - op: replace
        path: /metadata/name
        value: "svc1"
      - op: replace
        path: /metadata/labels/app
        value: "svc1"

Answer 1

You can use ConfigMaps and Secrets to hold configuration or sensitive data that are used by other Kubernetes objects, such as Pods. The source of ConfigMaps or Secrets are usually external to a cluster, such as a .properties file or an SSH keyfile. Kustomize has secretGenerator and configMapGenerator, which generate Secret and ConfigMap from files or literals.

To run patches with multiple paths with the same value,you need to store the value in a ConfigMap or Secret and reference it in your resources.

Define a ConfigMap in your kustomization.yaml:

configMapGenerator:
  - name: app-config
    literals:
      - appName=svc1   #(your path / value )

Reference the ConfigMap in your patch:

patches:
  - target:
      group: apps
      version: v1
      kind: Deployment
      name: common-base
    patch: |-
      - op: replace
        path: /metadata/name
        valueFrom:
          configMapKeyRef:
            name: app-config
            key: appName
      - op: replace
        path: /metadata/labels/app
        valueFrom:
          configMapKeyRef:
            name: app-config
            key: appName

So by following the above process by referencing the ConfigMap in your patch you will be able to achieve patching multiple paths with the same value in the Kustomize and you can also use a strategic merge patch and JSON patch which might also help you to resolve your issue.

For more information check this Github Link which might be helpful for you.