kustomize: add imagePullSecrets to all deployments

You could use patches field instead of patchesStrategicMerge in order to patch multiple resources.

Based on this demo example you can do this by specifiyng patch and target selector:

patches:- path: <PatchFile>   target:    group: <Group>    version: <Version>    kind: <Kind>    name: <Name>    namespace: <Namespace>    labelSelector: <LabelSelector>    annotationSelector: <AnnotationSelector>

In this case your kustomization.yaml should look like this:

bases:  - ../basepatches:- path: regcred-1.yaml target:   kind: Deployment

Let me know if that solved your case.

Something like this seems to work to append an imagePullSecret:

patches:    -   target:            kind: Deployment        patch: |-            - op: add              path: /spec/template/spec/imagePullSecrets/-              value:                name: regcred    -   target:            kind: CronJob        patch: |-            - op: replace              path: /spec/jobTemplate/spec/template/spec/imagePullSecrets              value:                - name: regcred

Or more simply, you can just run this once:

kubectl patch serviceaccount default -p '{"imagePullSecrets": [{"name": "regcred"}]}'

Using Inline Patch:

kind: KustomizationapiVersion: kustomize.config.k8s.io/v1beta1resources:  - ../../basepatches:  - target:      kind: Deployment    patch: |-      - op: add        path: /spec/template/spec/imagePullSecrets        value: [{ name: image-pull-secret }]

Reference: Patching multiple resources at once.