Ignore ingress

internal/ingress/controller/controller.go

@@ -134,6 +134,8 @@ type Configuration struct {
 	DeepInspector         bool
 
 	DynamicConfigurationRetries int
+
+	EnableAnnotationsPrefixCheck bool
 
 	DisableSyncEvents bool
 
@@ -309,8 +311,8 @@ func (n *NGINXController) CheckIngress(ing *networking.Ingress) error {
 	}
 
 	for key, value := range ing.ObjectMeta.GetAnnotations() {
-
-		if parser.AnnotationsPrefix != parser.DefaultAnnotationsPrefix {
+		klog.Warningf("EnableAnnotationsPrefixCheck set to false, Ignoring annotation check.")
+		if n.cfg.EnableAnnotationsPrefixCheck && parser.AnnotationsPrefix != parser.DefaultAnnotationsPrefix {
 			if strings.HasPrefix(key, fmt.Sprintf("%s/", parser.DefaultAnnotationsPrefix)) {
 				return fmt.Errorf("This deployment has a custom annotation prefix defined. Use '%s' instead of '%s'", parser.AnnotationsPrefix, parser.DefaultAnnotationsPrefix)
 			}

pkg/flags/flags.go

@@ -20,7 +20,6 @@ import (
 	"flag"
 	"fmt"
 	"net"
-	"os"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
@@ -35,6 +34,7 @@ import (
 	"k8s.io/ingress-nginx/internal/ingress/status"
 	ing_net "k8s.io/ingress-nginx/internal/net"
 	"k8s.io/ingress-nginx/internal/nginx"
+	"k8s.io/ingress-nginx/pkg/apis/ingress"
 	klog "k8s.io/klog/v2"
 )
 
@@ -219,6 +219,8 @@ Takes the form "<host>:port". If not provided, no admission controller is starte
 		disableSyncEvents = flags.Bool("disable-sync-events", false, "Disables the creation of 'Sync' event resources")
 
 		enableTopologyAwareRouting = flags.Bool("enable-topology-aware-routing", false, "Enable topology aware hints feature, needs service object annotation service.kubernetes.io/topology-aware-hints sets to auto.")
+
+		enableAnnotationsPrefixCheck = flags.Bool("enable-annotations-prefix-check", true, "Enables check for value of legacy ingressclass annotation")
 	)
 
 	flags.StringVar(&nginx.MaxmindMirror, "maxmind-mirror", "", `Maxmind mirror url (example: http://geoip.local/databases.`)
@@ -366,12 +368,13 @@ https://blog.maxmind.com/2019/12/18/significant-changes-to-accessing-and-using-g
 			WatchWithoutClass:  *watchWithoutClass,
 			IngressClassByName: *ingressClassByName,
 		},
-		DisableCatchAll:           *disableCatchAll,
-		ValidationWebhook:         *validationWebhook,
-		ValidationWebhookCertPath: *validationWebhookCert,
-		ValidationWebhookKeyPath:  *validationWebhookKey,
-		InternalLoggerAddress:     *internalLoggerAddress,
-		DisableSyncEvents:         *disableSyncEvents,
+		DisableCatchAll:              *disableCatchAll,
+		ValidationWebhook:            *validationWebhook,
+		ValidationWebhookCertPath:    *validationWebhookCert,
+		ValidationWebhookKeyPath:     *validationWebhookKey,
+		InternalLoggerAddress:        *internalLoggerAddress,
+		DisableSyncEvents:            *disableSyncEvents,
+		EnableAnnotationsPrefixCheck: *enableAnnotationsPrefixCheck,
 	}
 
 	if *apiserverHost != "" {