Add controller.watchIngressWithoutClass config option (#7459)

Signed-off-by: Akshit Grover <akshit.grover2016@gmail.com>

charts/ingress-nginx/ci/controller-custom-ingressclass-flags.yaml

@@ -0,0 +1,7 @@
+controller:
+  watchIngressWithoutClass: true
+  ingressClassResource:
+    name: custom-nginx
+    enabled: true
+    default: true
+    controllerValue: "k8s.io/custom-nginx"

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

@@ -108,6 +108,9 @@ spec:
           {{- if not (eq .Values.controller.healthCheckPath "/healthz") }}
             - --health-check-path={{ .Values.controller.healthCheckPath }}
           {{- end }}
+          {{- if .Values.controller.watchIngressWithoutClass }}
+            - --watch-ingress-without-class=true
+          {{- end }}
           {{- range $key, $value := .Values.controller.extraArgs }}
             {{- /* Accept keys without values or with false as value */}}
             {{- if eq ($value | quote | len) 2 }}

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

@@ -109,6 +109,9 @@ spec:
           {{- if not (eq .Values.controller.healthCheckPath "/healthz") }}
             - --health-check-path={{ .Values.controller.healthCheckPath }}
           {{- end }}
+          {{- if .Values.controller.watchIngressWithoutClass }}
+            - --watch-ingress-without-class=true
+          {{- end }}
           {{- range $key, $value := .Values.controller.extraArgs }}
             {{- /* Accept keys without values or with false as value */}}
             {{- if eq ($value | quote | len) 2 }}
@@ -140,7 +143,7 @@ spec:
           {{- end }}
           {{- if .Values.controller.extraEnvs }}
             {{- toYaml .Values.controller.extraEnvs | nindent 12 }}
-          {{- end }}          
+          {{- end }}
           {{- if .Values.controller.startupProbe }}
           startupProbe: {{ toYaml .Values.controller.startupProbe | nindent 12 }}
           {{- end }}

charts/ingress-nginx/values.yaml

@@ -58,6 +58,11 @@ controller:
   # Ingress status was blank because there is no Service exposing the NGINX Ingress controller in a configuration using the host network, the default --publish-service flag used in standard cloud setups does not apply
   reportNodeInternalIp: false
 
+  # Process Ingress objects without ingressClass annotation/ingressClassName field
+  # Overrides value for --watch-ingress-without-class flag of the controller binary
+  # Defaults to false
+  watchIngressWithoutClass: false
+
   # Required for use with CNI based kubernetes installations (such as ones set up by kubeadm),
   # since CNI and hostport don't mix yet. Can be deprecated once https://github.com/kubernetes/kubernetes/issues/23920
   # is merged