Copy a field with replacements

modern: replacements: copies a field cross-resource, replaces deprecated vars:

cat <<'EOF' >> kustomization.yaml replacements: - source: {kind: ConfigMap, name: cfg, fieldPath: data.host} targets: - select: {kind: Deployment} fieldPaths: [spec.template.spec.containers.0.env.0.value] EOF
tool
kustomize23 commands
tags
kustomizegitopsk8s

More kustomize commands

  • Inline patch with target selector
    cat <<'EOF' >> kustomization.yaml patches: - target: {kind: Deployment, labelSelector: app=api} patch: |- - op: replace path: /spec/replicas value: 3 EOF

    JSON6902 patch applied to all matching targets, no separate file

  • Pin image by digest and rename
    kustomize edit set image app=registry.example.com/app@sha256:<id>

    Pin by immutable digest; newName+digest also settable in images: block

  • Secret generator without hash suffix
    cat <<'EOF' >> kustomization.yaml secretGenerator: - name: db-creds literals: [PASSWORD=s3cr3t] generatorOptions: disableNameSuffixHash: true EOF

    note: disableNameSuffixHash keeps stable name but breaks rollout-on-change

  • Register CRD OpenAPI for merge keys
    cat <<'EOF' >> kustomization.yaml openapi: path: crd-schema.json EOF

    Teach kustomize CRD merge/list semantics so patches merge correctly

  • Build kustomization
    kustomize build ./overlays/prod

    Render all manifests for an overlay to stdout

all 23 kustomize commands