Chart: Make controller.config templatable. (#11181)

* [helm] pass controller.config through tpl

* add unittest

* update README.md

* Update charts/ingress-nginx/README.md

Co-authored-by: Marco Ebert <marco_ebert@icloud.com>

* Update charts/ingress-nginx/tests/controller-configmap_test.yaml

Co-authored-by: Marco Ebert <marco_ebert@icloud.com>

* Update charts/ingress-nginx/values.yaml

Co-authored-by: Marco Ebert <marco_ebert@icloud.com>

---------

Co-authored-by: Marco Ebert <marco_ebert@icloud.com>

charts/ingress-nginx/README.md

@@ -285,7 +285,7 @@ As of version `1.26.0` of this chart, by simply not providing any clusterIP valu
 | controller.autoscaling.targetCPUUtilizationPercentage | int | `50` |  |
 | controller.autoscaling.targetMemoryUtilizationPercentage | int | `50` |  |
 | controller.autoscalingTemplate | list | `[]` |  |
-| controller.config | object | `{}` | Will add custom configuration options to Nginx https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/ |
+| controller.config | object | `{}` | Global configuration passed to the ConfigMap consumed by the controller. Values may contain Helm templates. Ref.: https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/ |
 | controller.configAnnotations | object | `{}` | Annotations to be added to the controller config configuration configmap. |
 | controller.configMapNamespace | string | `""` | Allows customization of the configmap / nginx-configmap namespace; defaults to $(POD_NAMESPACE) |
 | controller.containerName | string | `"controller"` | Configures the controller container name |

charts/ingress-nginx/templates/controller-configmap.yaml

@@ -24,5 +24,5 @@ data:
   ssl-dh-param: {{ include "ingress-nginx.namespace" . }}/{{ include "ingress-nginx.controller.fullname" . }}
 {{- end }}
 {{- range $key, $value := .Values.controller.config }}
-  {{- $key | nindent 2 }}: {{ $value | quote }}
+  {{- $key | nindent 2 }}: {{ tpl (toString $value) $ | quote }}
 {{- end }}

charts/ingress-nginx/tests/controller-configmap_test.yaml

@@ -12,3 +12,20 @@ tests:
       - equal:
           path: metadata.name
           value: RELEASE-NAME-ingress-nginx-controller
+
+  - it: should create a ConfigMap with templated values if `controller.config` contains templates
+    set:
+      controller.config:
+        global-rate-limit-memcached-host: "memcached.{{ .Release.Namespace }}.svc.kubernetes.local"
+        global-rate-limit-memcached-port: 11211
+        use-gzip: true
+    asserts:
+      - equal:
+          path: data.global-rate-limit-memcached-host
+          value: memcached.NAMESPACE.svc.kubernetes.local
+      - equal:
+          path: data.global-rate-limit-memcached-port
+          value: "11211"
+      - equal:
+          path: data.use-gzip
+          value: "true"

charts/ingress-nginx/values.yaml

@@ -45,7 +45,8 @@ controller:
   containerPort:
     http: 80
     https: 443
-  # -- Will add custom configuration options to Nginx https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/
+  # -- Global configuration passed to the ConfigMap consumed by the controller. Values may contain Helm templates.
+  # Ref.: https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/
   config: {}
   # -- Annotations to be added to the controller config configuration configmap.
   configAnnotations: {}