Native Kubernetes service load-balancing at the provider level

docs/content/providers/kubernetes-crd.md

@@ -337,6 +337,30 @@ providers:
 --providers.kubernetescrd.allowexternalnameservices=true
 ```
 
+### `nativeLBByDefault`
+
+_Optional, Default: false_
+
+Defines whether to use Native Kubernetes load-balancing mode by default.
+For more information, please check out the IngressRoute `nativeLB` option [documentation](../routing/providers/kubernetes-crd.md#load-balancing).
+
+```yaml tab="File (YAML)"
+providers:
+  kubernetesCRD:
+    nativeLBByDefault: true
+    # ...
+```
+
+```toml tab="File (TOML)"
+[providers.kubernetesCRD]
+  nativeLBByDefault = true
+  # ...
+```
+
+```bash tab="CLI"
+--providers.kubernetescrd.nativeLBByDefault=true
+```
+
 ## Full Example
 
 For additional information, refer to the [full example](../user-guides/crd-acme/index.md) with Let's Encrypt.

docs/content/providers/kubernetes-ingress.md

@@ -467,6 +467,30 @@ providers:
 --providers.kubernetesingress.allowexternalnameservices=true
 ```
 
+### `nativeLBByDefault`
+
+_Optional, Default: false_
+
+Defines whether to use Native Kubernetes load-balancing mode by default.
+For more information, please check out the `traefik.ingress.kubernetes.io/service.nativelb` [service annotation documentation](../routing/providers/kubernetes-ingress.md#on-service).
+
+```yaml tab="File (YAML)"
+providers:
+  kubernetesIngress:
+    nativeLBByDefault: true
+    # ...
+```
+
+```toml tab="File (TOML)"
+[providers.kubernetesIngress]
+  nativeLBByDefault = true
+  # ...
+```
+
+```bash tab="CLI"
+--providers.kubernetesingress.nativeLBByDefault=true
+```
+
 ### Further
 
 To learn more about the various aspects of the Ingress specification that Traefik supports,

docs/content/reference/static-configuration/cli-ref.md

@@ -714,6 +714,9 @@ Kubernetes label selector to use.
 `--providers.kubernetescrd.namespaces`:  
 Kubernetes namespaces.
 
+`--providers.kubernetescrd.nativelbbydefault`:  
+Defines whether to use Native Kubernetes load-balancing mode by default. (Default: ```false```)
+
 `--providers.kubernetescrd.throttleduration`:  
 Ingress refresh throttle duration (Default: ```0```)
 
@@ -795,6 +798,9 @@ Kubernetes Ingress label selector to use.
 `--providers.kubernetesingress.namespaces`:  
 Kubernetes namespaces.
 
+`--providers.kubernetesingress.nativelbbydefault`:  
+Defines whether to use Native Kubernetes load-balancing mode by default. (Default: ```false```)
+
 `--providers.kubernetesingress.throttleduration`:  
 Ingress refresh throttle duration (Default: ```0```)
 

docs/content/reference/static-configuration/env-ref.md

@@ -714,6 +714,9 @@ Kubernetes label selector to use.
 `TRAEFIK_PROVIDERS_KUBERNETESCRD_NAMESPACES`:  
 Kubernetes namespaces.
 
+`TRAEFIK_PROVIDERS_KUBERNETESCRD_NATIVELBBYDEFAULT`:  
+Defines whether to use Native Kubernetes load-balancing mode by default. (Default: ```false```)
+
 `TRAEFIK_PROVIDERS_KUBERNETESCRD_THROTTLEDURATION`:  
 Ingress refresh throttle duration (Default: ```0```)
 
@@ -795,6 +798,9 @@ Kubernetes Ingress label selector to use.
 `TRAEFIK_PROVIDERS_KUBERNETESINGRESS_NAMESPACES`:  
 Kubernetes namespaces.
 
+`TRAEFIK_PROVIDERS_KUBERNETESINGRESS_NATIVELBBYDEFAULT`:  
+Defines whether to use Native Kubernetes load-balancing mode by default. (Default: ```false```)
+
 `TRAEFIK_PROVIDERS_KUBERNETESINGRESS_THROTTLEDURATION`:  
 Ingress refresh throttle duration (Default: ```0```)
 

docs/content/reference/static-configuration/file.toml

@@ -124,6 +124,7 @@
     allowEmptyServices = true
     allowExternalNameServices = true
     disableIngressClassLookup = true
+    nativeLBByDefault = true
     [providers.kubernetesIngress.ingressEndpoint]
       ip = "foobar"
       hostname = "foobar"
@@ -139,6 +140,7 @@
     ingressClass = "foobar"
     throttleDuration = "42s"
     allowEmptyServices = true
+    nativeLBByDefault = true
   [providers.kubernetesGateway]
     endpoint = "foobar"
     token = "foobar"

docs/content/reference/static-configuration/file.yaml

@@ -141,6 +141,7 @@ providers:
     allowEmptyServices: true
     allowExternalNameServices: true
     disableIngressClassLookup: true
+    nativeLBByDefault: true
   kubernetesCRD:
     endpoint: foobar
     token: foobar
@@ -154,6 +155,7 @@ providers:
     ingressClass: foobar
     throttleDuration: 42s
     allowEmptyServices: true
+    nativeLBByDefault: true
   kubernetesGateway:
     endpoint: foobar
     token: foobar

pkg/provider/kubernetes/crd/fixtures/tcp/with_global_native_service_lb.yml

@@ -0,0 +1,15 @@
+apiVersion: traefik.io/v1alpha1
+kind: IngressRouteTCP
+metadata:
+  name: global-native-lb
+  namespace: default
+
+spec:
+  entryPoints:
+    - foo
+
+  routes:
+  - match: HostSNI(`foo.com`)
+    services:
+    - name: native-svc-tcp
+      port: 8000

pkg/provider/kubernetes/crd/fixtures/udp/with_global_native_service_lb.yml

@@ -0,0 +1,14 @@
+apiVersion: traefik.io/v1alpha1
+kind: IngressRouteUDP
+metadata:
+  name: global-native-lb
+  namespace: default
+
+spec:
+  entryPoints:
+    - foo
+
+  routes:
+  - services:
+    - name: native-svc-udp
+      port: 8000

pkg/provider/kubernetes/crd/fixtures/with_global_native_service_lb.yml

@@ -0,0 +1,16 @@
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: global-native-lb
+  namespace: default
+
+spec:
+  entryPoints:
+    - foo
+
+  routes:
+  - match: Host(`foo.com`)
+    kind: Rule
+    services:
+    - name: native-svc
+      port: 80

pkg/provider/kubernetes/crd/kubernetes.go

@@ -60,6 +60,7 @@ type Provider struct {
 	IngressClass              string              `description:"Value of kubernetes.io/ingress.class annotation to watch for." json:"ingressClass,omitempty" toml:"ingressClass,omitempty" yaml:"ingressClass,omitempty" export:"true"`
 	ThrottleDuration          ptypes.Duration     `description:"Ingress refresh throttle duration" json:"throttleDuration,omitempty" toml:"throttleDuration,omitempty" yaml:"throttleDuration,omitempty" export:"true"`
 	AllowEmptyServices        bool                `description:"Allow the creation of services without endpoints." json:"allowEmptyServices,omitempty" toml:"allowEmptyServices,omitempty" yaml:"allowEmptyServices,omitempty" export:"true"`
+	NativeLBByDefault         bool                `description:"Defines whether to use Native Kubernetes load-balancing mode by default." json:"nativeLBByDefault,omitempty" toml:"nativeLBByDefault,omitempty" yaml:"nativeLBByDefault,omitempty" export:"true"`
 
 	lastConfiguration safe.Safe
 

pkg/provider/kubernetes/crd/kubernetes_http.go

@@ -55,6 +55,7 @@ func (p *Provider) loadIngressRouteConfiguration(ctx context.Context, client Cli
 			allowCrossNamespace:       p.AllowCrossNamespace,
 			allowExternalNameServices: p.AllowExternalNameServices,
 			allowEmptyServices:        p.AllowEmptyServices,
+			NativeLBByDefault:         p.NativeLBByDefault,
 		}
 
 		for _, route := range ingressRoute.Spec.Routes {
@@ -202,6 +203,7 @@ type configBuilder struct {
 	allowCrossNamespace       bool
 	allowExternalNameServices bool
 	allowEmptyServices        bool
+	NativeLBByDefault         bool
 }
 
 // buildTraefikService creates the configuration for the traefik service defined in tService,
@@ -377,20 +379,6 @@ func (c configBuilder) loadServers(parentNamespace string, svc traefikv1alpha1.L
 		return nil, err
 	}
 
-	if svc.NativeLB {
-		address, err := getNativeServiceAddress(*service, *svcPort)
-		if err != nil {
-			return nil, fmt.Errorf("getting native Kubernetes Service address: %w", err)
-		}
-
-		protocol, err := parseServiceProtocol(svc.Scheme, svcPort.Name, svcPort.Port)
-		if err != nil {
-			return nil, err
-		}
-
-		return []dynamic.Server{{URL: fmt.Sprintf("%s://%s", protocol, address)}}, nil
-	}
-
 	var servers []dynamic.Server
 	if service.Spec.Type == corev1.ServiceTypeExternalName {
 		if !c.allowExternalNameServices {
@@ -409,6 +397,24 @@ func (c configBuilder) loadServers(parentNamespace string, svc traefikv1alpha1.L
 		}), nil
 	}
 
+	nativeLB := c.NativeLBByDefault
+	if svc.NativeLB != nil {
+		nativeLB = *svc.NativeLB
+	}
+	if nativeLB {
+		address, err := getNativeServiceAddress(*service, *svcPort)
+		if err != nil {
+			return nil, fmt.Errorf("getting native Kubernetes Service address: %w", err)
+		}
+
+		protocol, err := parseServiceProtocol(svc.Scheme, svcPort.Name, svcPort.Port)
+		if err != nil {
+			return nil, err
+		}
+
+		return []dynamic.Server{{URL: fmt.Sprintf("%s://%s", protocol, address)}}, nil
+	}
+
 	endpoints, endpointsExists, endpointsErr := c.client.GetEndpoints(namespace, sanitizedName)
 	if endpointsErr != nil {
 		return nil, endpointsErr

pkg/provider/kubernetes/crd/kubernetes_tcp.go

@@ -237,21 +237,25 @@ func (p *Provider) loadTCPServers(client Client, namespace string, svc traefikv1
 		return nil, err
 	}
 
-	if svc.NativeLB {
-		address, err := getNativeServiceAddress(*service, *svcPort)
-		if err != nil {
-			return nil, fmt.Errorf("getting native Kubernetes Service address: %w", err)
-		}
-
-		return []dynamic.TCPServer{{Address: address}}, nil
-	}
-
 	var servers []dynamic.TCPServer
 	if service.Spec.Type == corev1.ServiceTypeExternalName {
 		servers = append(servers, dynamic.TCPServer{
 			Address: net.JoinHostPort(service.Spec.ExternalName, strconv.Itoa(int(svcPort.Port))),
 		})
 	} else {
+		nativeLB := p.NativeLBByDefault
+		if svc.NativeLB != nil {
+			nativeLB = *svc.NativeLB
+		}
+		if nativeLB {
+			address, err := getNativeServiceAddress(*service, *svcPort)
+			if err != nil {
+				return nil, fmt.Errorf("getting native Kubernetes Service address: %w", err)
+			}
+
+			return []dynamic.TCPServer{{Address: address}}, nil
+		}
+
 		endpoints, endpointsExists, endpointsErr := client.GetEndpoints(namespace, svc.Name)
 		if endpointsErr != nil {
 			return nil, endpointsErr

pkg/provider/kubernetes/crd/kubernetes_test.go

@@ -7180,3 +7180,339 @@ func (p *extensionBuilderRegistryMock) RegisterBackendFuncs(group, kind string,
 
 	p.groupKindBackendFuncs[group][kind] = builderFunc
 }
+
+func TestGlobalNativeLB(t *testing.T) {
+	testCases := []struct {
+		desc              string
+		ingressClass      string
+		paths             []string
+		NativeLBByDefault bool
+		expected          *dynamic.Configuration
+	}{
+		{
+			desc: "Empty",
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+					Routers:           map[string]*dynamic.TCPRouter{},
+					Middlewares:       map[string]*dynamic.TCPMiddleware{},
+					Services:          map[string]*dynamic.TCPService{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+					Routers:           map[string]*dynamic.Router{},
+					Middlewares:       map[string]*dynamic.Middleware{},
+					Services:          map[string]*dynamic.Service{},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+		{
+			desc:              "HTTP with global native Service LB",
+			paths:             []string{"services.yml", "with_global_native_service_lb.yml"},
+			NativeLBByDefault: true,
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+					Routers:           map[string]*dynamic.TCPRouter{},
+					Middlewares:       map[string]*dynamic.TCPMiddleware{},
+					Services:          map[string]*dynamic.TCPService{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+					Routers: map[string]*dynamic.Router{
+						"default-global-native-lb-6f97418635c7e18853da": {
+							EntryPoints: []string{"foo"},
+							Service:     "default-global-native-lb-6f97418635c7e18853da",
+							Rule:        "Host(`foo.com`)",
+							Priority:    0,
+						},
+					},
+					Middlewares: map[string]*dynamic.Middleware{},
+					Services: map[string]*dynamic.Service{
+						"default-global-native-lb-6f97418635c7e18853da": {
+							LoadBalancer: &dynamic.ServersLoadBalancer{
+								ResponseForwarding: &dynamic.ResponseForwarding{FlushInterval: dynamic.DefaultFlushInterval},
+								Servers: []dynamic.Server{
+									{
+										URL: "http://10.10.0.1:80",
+									},
+								},
+								PassHostHeader: Bool(true),
+							},
+						},
+					},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+		{
+			desc:  "HTTP with native Service LB in ingressroute",
+			paths: []string{"services.yml", "with_native_service_lb.yml"},
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+					Routers:           map[string]*dynamic.TCPRouter{},
+					Middlewares:       map[string]*dynamic.TCPMiddleware{},
+					Services:          map[string]*dynamic.TCPService{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+					Routers: map[string]*dynamic.Router{
+						"default-test-route-6f97418635c7e18853da": {
+							EntryPoints: []string{"foo"},
+							Service:     "default-test-route-6f97418635c7e18853da",
+							Rule:        "Host(`foo.com`)",
+							Priority:    0,
+						},
+					},
+					Middlewares: map[string]*dynamic.Middleware{},
+					Services: map[string]*dynamic.Service{
+						"default-test-route-6f97418635c7e18853da": {
+							LoadBalancer: &dynamic.ServersLoadBalancer{
+								ResponseForwarding: &dynamic.ResponseForwarding{FlushInterval: dynamic.DefaultFlushInterval},
+								Servers: []dynamic.Server{
+									{
+										URL: "http://10.10.0.1:80",
+									},
+								},
+								PassHostHeader: Bool(true),
+							},
+						},
+					},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+		{
+			desc:              "TCP with global native Service LB",
+			paths:             []string{"tcp/services.yml", "tcp/with_global_native_service_lb.yml"},
+			NativeLBByDefault: true,
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+					Routers:           map[string]*dynamic.Router{},
+					Middlewares:       map[string]*dynamic.Middleware{},
+					Services:          map[string]*dynamic.Service{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+					Routers: map[string]*dynamic.TCPRouter{
+						"default-global-native-lb-fdd3e9338e47a45efefc": {
+							EntryPoints: []string{"foo"},
+							Service:     "default-global-native-lb-fdd3e9338e47a45efefc",
+							Rule:        "HostSNI(`foo.com`)",
+						},
+					},
+					Middlewares: map[string]*dynamic.TCPMiddleware{},
+					Services: map[string]*dynamic.TCPService{
+						"default-global-native-lb-fdd3e9338e47a45efefc": {
+							LoadBalancer: &dynamic.TCPServersLoadBalancer{
+								Servers: []dynamic.TCPServer{
+									{
+										Address: "10.10.0.1:8000",
+										Port:    "",
+									},
+								},
+							},
+						},
+					},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+		{
+			desc:  "TCP with native Service LB in ingressroute",
+			paths: []string{"tcp/services.yml", "tcp/with_native_service_lb.yml"},
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+					Routers:           map[string]*dynamic.Router{},
+					Middlewares:       map[string]*dynamic.Middleware{},
+					Services:          map[string]*dynamic.Service{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+					Routers: map[string]*dynamic.TCPRouter{
+						"default-test.route-fdd3e9338e47a45efefc": {
+							EntryPoints: []string{"foo"},
+							Service:     "default-test.route-fdd3e9338e47a45efefc",
+							Rule:        "HostSNI(`foo.com`)",
+						},
+					},
+					Middlewares: map[string]*dynamic.TCPMiddleware{},
+					Services: map[string]*dynamic.TCPService{
+						"default-test.route-fdd3e9338e47a45efefc": {
+							LoadBalancer: &dynamic.TCPServersLoadBalancer{
+								Servers: []dynamic.TCPServer{
+									{
+										Address: "10.10.0.1:8000",
+										Port:    "",
+									},
+								},
+							},
+						},
+					},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+		{
+			desc:  "UDP with native Service LB in ingressroute",
+			paths: []string{"udp/services.yml", "udp/with_native_service_lb.yml"},
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers: map[string]*dynamic.UDPRouter{
+						"default-test.route-0": {
+							EntryPoints: []string{"foo"},
+							Service:     "default-test.route-0",
+						},
+					},
+					Services: map[string]*dynamic.UDPService{
+						"default-test.route-0": {
+							LoadBalancer: &dynamic.UDPServersLoadBalancer{
+								Servers: []dynamic.UDPServer{
+									{
+										Address: "10.10.0.1:8000",
+										Port:    "",
+									},
+								},
+							},
+						},
+					},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+					Routers:           map[string]*dynamic.Router{},
+					Middlewares:       map[string]*dynamic.Middleware{},
+					Services:          map[string]*dynamic.Service{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+					Routers:           map[string]*dynamic.TCPRouter{},
+					Middlewares:       map[string]*dynamic.TCPMiddleware{},
+					Services:          map[string]*dynamic.TCPService{},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+		{
+			desc:              "UDP with global native Service LB",
+			paths:             []string{"udp/services.yml", "udp/with_global_native_service_lb.yml"},
+			NativeLBByDefault: true,
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers: map[string]*dynamic.UDPRouter{
+						"default-global-native-lb-0": {
+							EntryPoints: []string{"foo"},
+							Service:     "default-global-native-lb-0",
+						},
+					},
+					Services: map[string]*dynamic.UDPService{
+						"default-global-native-lb-0": {
+							LoadBalancer: &dynamic.UDPServersLoadBalancer{
+								Servers: []dynamic.UDPServer{
+									{
+										Address: "10.10.0.1:8000",
+										Port:    "",
+									},
+								},
+							},
+						},
+					},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+					Routers:           map[string]*dynamic.Router{},
+					Middlewares:       map[string]*dynamic.Middleware{},
+					Services:          map[string]*dynamic.Service{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+					Routers:           map[string]*dynamic.TCPRouter{},
+					Middlewares:       map[string]*dynamic.TCPMiddleware{},
+					Services:          map[string]*dynamic.TCPService{},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			var k8sObjects []runtime.Object
+			var crdObjects []runtime.Object
+			for _, path := range test.paths {
+				yamlContent, err := os.ReadFile(filepath.FromSlash("./fixtures/" + path))
+				if err != nil {
+					panic(err)
+				}
+
+				objects := k8s.MustParseYaml(yamlContent)
+				for _, obj := range objects {
+					switch o := obj.(type) {
+					case *corev1.Service, *corev1.Endpoints, *corev1.Secret:
+						k8sObjects = append(k8sObjects, o)
+					case *traefikv1alpha1.IngressRoute:
+						crdObjects = append(crdObjects, o)
+					case *traefikv1alpha1.IngressRouteTCP:
+						crdObjects = append(crdObjects, o)
+					case *traefikv1alpha1.IngressRouteUDP:
+						crdObjects = append(crdObjects, o)
+					case *traefikv1alpha1.Middleware:
+						crdObjects = append(crdObjects, o)
+					case *traefikv1alpha1.TraefikService:
+						crdObjects = append(crdObjects, o)
+					case *traefikv1alpha1.TLSOption:
+						crdObjects = append(crdObjects, o)
+					case *traefikv1alpha1.TLSStore:
+						crdObjects = append(crdObjects, o)
+					default:
+					}
+				}
+			}
+
+			kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+			crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
+
+			client := newClientImpl(kubeClient, crdClient)
+
+			stopCh := make(chan struct{})
+
+			eventCh, err := client.WatchAll([]string{"default", "cross-ns"}, stopCh)
+			require.NoError(t, err)
+
+			if k8sObjects != nil || crdObjects != nil {
+				// just wait for the first event
+				<-eventCh
+			}
+
+			p := Provider{NativeLBByDefault: test.NativeLBByDefault}
+
+			conf := p.loadConfigurationFromCRD(context.Background(), client)
+			assert.Equal(t, test.expected, conf)
+		})
+	}
+}

pkg/provider/kubernetes/crd/kubernetes_udp.go

@@ -121,21 +121,25 @@ func (p *Provider) loadUDPServers(client Client, namespace string, svc traefikv1
 		return nil, err
 	}
 
-	if svc.NativeLB {
-		address, err := getNativeServiceAddress(*service, *svcPort)
-		if err != nil {
-			return nil, fmt.Errorf("getting native Kubernetes Service address: %w", err)
-		}
-
-		return []dynamic.UDPServer{{Address: address}}, nil
-	}
-
 	var servers []dynamic.UDPServer
 	if service.Spec.Type == corev1.ServiceTypeExternalName {
 		servers = append(servers, dynamic.UDPServer{
 			Address: net.JoinHostPort(service.Spec.ExternalName, strconv.Itoa(int(svcPort.Port))),
 		})
 	} else {
+		nativeLB := p.NativeLBByDefault
+		if svc.NativeLB != nil {
+			nativeLB = *svc.NativeLB
+		}
+		if nativeLB {
+			address, err := getNativeServiceAddress(*service, *svcPort)
+			if err != nil {
+				return nil, fmt.Errorf("getting native Kubernetes Service address: %w", err)
+			}
+
+			return []dynamic.UDPServer{{Address: address}}, nil
+		}
+
 		endpoints, endpointsExists, endpointsErr := client.GetEndpoints(namespace, svc.Name)
 		if endpointsErr != nil {
 			return nil, endpointsErr

pkg/provider/kubernetes/crd/traefikio/v1alpha1/ingressroute.go

@@ -125,7 +125,7 @@ type LoadBalancerSpec struct {
 	// whether the LB's children are directly the pods IPs or if the only child is the Kubernetes Service clusterIP.
 	// The Kubernetes Service itself does load-balance to the pods.
 	// By default, NativeLB is false.
-	NativeLB bool `json:"nativeLB,omitempty"`
+	NativeLB *bool `json:"nativeLB,omitempty"`
 }
 
 type ResponseForwarding struct {

pkg/provider/kubernetes/crd/traefikio/v1alpha1/ingressroutetcp.go

@@ -92,7 +92,7 @@ type ServiceTCP struct {
 	// whether the LB's children are directly the pods IPs or if the only child is the Kubernetes Service clusterIP.
 	// The Kubernetes Service itself does load-balance to the pods.
 	// By default, NativeLB is false.
-	NativeLB bool `json:"nativeLB,omitempty"`
+	NativeLB *bool `json:"nativeLB,omitempty"`
 }
 
 // +genclient

pkg/provider/kubernetes/crd/traefikio/v1alpha1/ingressrouteudp.go

@@ -37,7 +37,7 @@ type ServiceUDP struct {
 	// whether the LB's children are directly the pods IPs or if the only child is the Kubernetes Service clusterIP.
 	// The Kubernetes Service itself does load-balance to the pods.
 	// By default, NativeLB is false.
-	NativeLB bool `json:"nativeLB,omitempty"`
+	NativeLB *bool `json:"nativeLB,omitempty"`
 }
 
 // +genclient

pkg/provider/kubernetes/crd/traefikio/v1alpha1/zz_generated.deepcopy.go

@@ -577,6 +577,11 @@ func (in *LoadBalancerSpec) DeepCopyInto(out *LoadBalancerSpec) {
 		*out = new(int)
 		**out = **in
 	}
+	if in.NativeLB != nil {
+		in, out := &in.NativeLB, &out.NativeLB
+		*out = new(bool)
+		**out = **in
+	}
 	return
 }
 
@@ -1333,6 +1338,11 @@ func (in *ServiceTCP) DeepCopyInto(out *ServiceTCP) {
 		*out = new(dynamic.ProxyProtocol)
 		**out = **in
 	}
+	if in.NativeLB != nil {
+		in, out := &in.NativeLB, &out.NativeLB
+		*out = new(bool)
+		**out = **in
+	}
 	return
 }
 
@@ -1355,6 +1365,11 @@ func (in *ServiceUDP) DeepCopyInto(out *ServiceUDP) {
 		*out = new(int)
 		**out = **in
 	}
+	if in.NativeLB != nil {
+		in, out := &in.NativeLB, &out.NativeLB
+		*out = new(bool)
+		**out = **in
+	}
 	return
 }
 

pkg/provider/kubernetes/ingress/annotations.go

@@ -45,7 +45,7 @@ type ServiceIng struct {
 	ServersTransport string          `json:"serversTransport,omitempty"`
 	PassHostHeader   *bool           `json:"passHostHeader"`
 	Sticky           *dynamic.Sticky `json:"sticky,omitempty" label:"allowEmpty"`
-	NativeLB         bool            `json:"nativeLB,omitempty"`
+	NativeLB         *bool           `json:"nativeLB,omitempty"`
 }
 
 // SetDefaults sets the default values.

pkg/provider/kubernetes/ingress/annotations_test.go

@@ -125,7 +125,7 @@ func Test_parseServiceConfig(t *testing.T) {
 					ServersScheme:    "protocol",
 					ServersTransport: "foobar@file",
 					PassHostHeader:   Bool(true),
-					NativeLB:         true,
+					NativeLB:         Bool(true),
 				},
 			},
 		},

pkg/provider/kubernetes/ingress/fixtures/Ingress-with-native-lb-by-default.yml

@@ -0,0 +1,30 @@
+kind: Ingress
+apiVersion: networking.k8s.io/v1
+metadata:
+  name: global-native-lb
+  namespace: default
+spec:
+  rules:
+  - host: traefik.tchouk
+    http:
+      paths:
+      - path: /bar
+        backend:
+          service:
+            name: service1
+            port:
+              number: 8080
+        pathType: Prefix
+
+---
+kind: Service
+apiVersion: v1
+metadata:
+  name: service1
+  namespace: default
+spec:
+  ports:
+    - port: 8080
+  clusterIP: 10.0.0.1
+  type: ClusterIP
+  externalName: traefik.wtf

pkg/provider/kubernetes/ingress/kubernetes.go

@@ -52,6 +52,7 @@ type Provider struct {
 	AllowEmptyServices        bool                `description:"Allow creation of services without endpoints." json:"allowEmptyServices,omitempty" toml:"allowEmptyServices,omitempty" yaml:"allowEmptyServices,omitempty" export:"true"`
 	AllowExternalNameServices bool                `description:"Allow ExternalName services." json:"allowExternalNameServices,omitempty" toml:"allowExternalNameServices,omitempty" yaml:"allowExternalNameServices,omitempty" export:"true"`
 	DisableIngressClassLookup bool                `description:"Disables the lookup of IngressClasses." json:"disableIngressClassLookup,omitempty" toml:"disableIngressClassLookup,omitempty" yaml:"disableIngressClassLookup,omitempty" export:"true"`
+	NativeLBByDefault         bool                `description:"Defines whether to use Native Kubernetes load-balancing mode by default." json:"nativeLBByDefault,omitempty" toml:"nativeLBByDefault,omitempty" yaml:"nativeLBByDefault,omitempty" export:"true"`
 
 	lastConfiguration safe.Safe
 
@@ -571,6 +572,8 @@ func (p *Provider) loadService(client Client, namespace string, backend netv1.In
 		return nil, err
 	}
 
+	nativeLB := p.NativeLBByDefault
+
 	if svcConfig != nil && svcConfig.Service != nil {
 		svc.LoadBalancer.Sticky = svcConfig.Service.Sticky
 
@@ -582,19 +585,8 @@ func (p *Provider) loadService(client Client, namespace string, backend netv1.In
 			svc.LoadBalancer.ServersTransport = svcConfig.Service.ServersTransport
 		}
 
-		if svcConfig.Service.NativeLB {
+		if svcConfig.Service.NativeLB != nil {
-			address, err := getNativeServiceAddress(*service, portSpec)
+			nativeLB = *svcConfig.Service.NativeLB
-			if err != nil {
-				return nil, fmt.Errorf("getting native Kubernetes Service address: %w", err)
-			}
-
-			protocol := getProtocol(portSpec, portSpec.Name, svcConfig)
-
-			svc.LoadBalancer.Servers = []dynamic.Server{
-				{URL: fmt.Sprintf("%s://%s", protocol, address)},
-			}
-
-			return svc, nil
 		}
 	}
 
@@ -609,6 +601,20 @@ func (p *Provider) loadService(client Client, namespace string, backend netv1.In
 		return svc, nil
 	}
 
+	if nativeLB {
+		address, err := getNativeServiceAddress(*service, portSpec)
+		if err != nil {
+			return nil, fmt.Errorf("getting native Kubernetes Service address: %w", err)
+		}
+
+		protocol := getProtocol(portSpec, portSpec.Name, svcConfig)
+		svc.LoadBalancer.Servers = []dynamic.Server{
+			{URL: fmt.Sprintf("%s://%s", protocol, address)},
+		}
+
+		return svc, nil
+	}
+
 	endpoints, endpointsExists, endpointsErr := client.GetEndpoints(namespace, backend.Service.Name)
 	if endpointsErr != nil {
 		return nil, endpointsErr

pkg/provider/kubernetes/ingress/kubernetes_test.go

@@ -1864,3 +1864,84 @@ func TestGetCertificates(t *testing.T) {
 		})
 	}
 }
+
+func TestLoadConfigurationFromIngressesWithNativeLBByDefault(t *testing.T) {
+	testCases := []struct {
+		desc         string
+		ingressClass string
+		expected     *dynamic.Configuration
+	}{
+		{
+			desc: "Ingress with native service lb",
+			expected: &dynamic.Configuration{
+				TCP: &dynamic.TCPConfiguration{},
+				HTTP: &dynamic.HTTPConfiguration{
+					Middlewares: map[string]*dynamic.Middleware{},
+					Routers: map[string]*dynamic.Router{
+						"testing-traefik-tchouk-bar": {
+							Rule:    "Host(`traefik.tchouk`) && PathPrefix(`/bar`)",
+							Service: "testing-service1-8080",
+						},
+					},
+					Services: map[string]*dynamic.Service{
+						"testing-service1-8080": {
+							LoadBalancer: &dynamic.ServersLoadBalancer{
+								ResponseForwarding: &dynamic.ResponseForwarding{FlushInterval: dynamic.DefaultFlushInterval},
+								PassHostHeader:     Bool(true),
+								Servers: []dynamic.Server{
+									{
+										URL: "http://10.0.0.1:8080",
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+		{
+			desc: "Ingress with native lb by default",
+			expected: &dynamic.Configuration{
+				TCP: &dynamic.TCPConfiguration{},
+				HTTP: &dynamic.HTTPConfiguration{
+					Middlewares: map[string]*dynamic.Middleware{},
+					Routers: map[string]*dynamic.Router{
+						"default-global-native-lb-traefik-tchouk-bar": {
+							Rule:    "Host(`traefik.tchouk`) && PathPrefix(`/bar`)",
+							Service: "default-service1-8080",
+						},
+					},
+					Services: map[string]*dynamic.Service{
+						"default-service1-8080": {
+							LoadBalancer: &dynamic.ServersLoadBalancer{
+								ResponseForwarding: &dynamic.ResponseForwarding{FlushInterval: dynamic.DefaultFlushInterval},
+								PassHostHeader:     Bool(true),
+								Servers: []dynamic.Server{
+									{
+										URL: "http://10.0.0.1:8080",
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			clientMock := newClientMock(generateTestFilename(test.desc))
+
+			p := Provider{
+				IngressClass:      test.ingressClass,
+				NativeLBByDefault: true,
+			}
+			conf := p.loadConfigurationFromIngresses(context.Background(), clientMock)
+
+			assert.Equal(t, test.expected, conf)
+		})
+	}
+}