scaffold controller

config/certmanager/certificate.yaml

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+# The following manifests contain a self-signed issuer CR and a certificate CR.
+# More document can be found at https://docs.cert-manager.io
+apiVersion: certmanager.k8s.io/v1alpha1
+kind: Issuer
+metadata:
+  name: selfsigned-issuer
+  namespace: system
+spec:
+  selfSigned: {}
+---
+apiVersion: certmanager.k8s.io/v1alpha1
+kind: Certificate
+metadata:
+  name: serving-cert  # this name should match the one appeared in kustomizeconfig.yaml
+  namespace: system
+spec:
+  # $(SERVICENAME) and $(NAMESPACE) will be substituted by kustomize
+  commonName: $(SERVICENAME).$(NAMESPACE).svc
+  dnsNames:
+  - $(SERVICENAME).$(NAMESPACE).svc.cluster.local
+  issuerRef:
+    kind: Issuer
+    name: selfsigned-issuer
+  secretName: webhook-server-cert # this secret will not be prefixed, since it's not managed by kustomize

config/certmanager/kustomization.yaml

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+resources:
+- certificate.yaml
+
+# the following config is for teaching kustomize how to do var substitution
+vars:
+- name: NAMESPACE # namespace of the service and the certificate CR
+  objref:
+    kind: Service
+    version: v1
+    name: webhook-service
+  fieldref:
+    fieldpath: metadata.namespace
+- name: CERTIFICATENAME
+  objref:
+    kind: Certificate
+    group: certmanager.k8s.io
+    version: v1alpha1
+    name: serving-cert # this name should match the one in certificate.yaml
+- name: SERVICENAME
+  objref:
+    kind: Service
+    version: v1
+    name: webhook-service
+
+configurations:
+- kustomizeconfig.yaml

config/certmanager/kustomizeconfig.yaml

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+# This configuration is for teaching kustomize how to update name ref and var substitution 
+nameReference:
+- kind: Issuer
+  group: certmanager.k8s.io
+  fieldSpecs:
+  - kind: Certificate
+    group: certmanager.k8s.io
+    path: spec/issuerRef/name
+
+varReference:
+- kind: Certificate
+  group: certmanager.k8s.io
+  path: spec/commonName
+- kind: Certificate
+  group: certmanager.k8s.io
+  path: spec/dnsNames