# Traefik & Kubernetes The Kubernetes Gateway API, The Experimental Way. {: .subtitle } ## Configuration Examples ??? example "Configuring Kubernetes Gateway provider and Deploying/Exposing Services" ```yaml tab="Gateway API" --8<-- "content/reference/dynamic-configuration/kubernetes-gateway-simple-https.yml" ``` ```yaml tab="Whoami Service" --8<-- "content/reference/dynamic-configuration/kubernetes-whoami-svc.yml" ``` ```yaml tab="Traefik Service" --8<-- "content/reference/dynamic-configuration/kubernetes-gateway-traefik-lb-svc.yml" ``` ```yaml tab="RBAC" --8<-- "content/reference/dynamic-configuration/kubernetes-gateway-rbac.yml" ``` ## Routing Configuration ### Custom Resource Definition (CRD) * You can find an exhaustive list, of the custom resources and their attributes in [the reference page](../../reference/dynamic-configuration/kubernetes-gateway.md) or in the Kubernetes Sigs `Gateway API` [repository](https://github.com/kubernetes-sigs/gateway-api). * Validate that [the prerequisites](../../providers/kubernetes-gateway.md#configuration-requirements) are fulfilled before using the Traefik Kubernetes Gateway Provider. You can find an excerpt of the supported Kubernetes Gateway API resources in the table below: | Kind | Purpose | Concept Behind | |------------------------------------|---------------------------------------------------------------------------|-----------------------------------------------------------------------------| | [GatewayClass](#kind-gatewayclass) | Defines a set of Gateways that share a common configuration and behaviour | [GatewayClass](https://gateway-api.sigs.k8s.io/api-overview/#gatewayclass) | | [Gateway](#kind-gateway) | Describes how traffic can be translated to Services within the cluster | [Gateway](https://gateway-api.sigs.k8s.io/api-overview/#gateway) | | [HTTPRoute](#kind-httproute) | HTTP rules for mapping requests from a Gateway to Kubernetes Services | [Route](https://gateway-api.sigs.k8s.io/api-overview/#httptcpfooroute) | ### Kind: `GatewayClass` `GatewayClass` is cluster-scoped resource defined by the infrastructure provider. This resource represents a class of Gateways that can be instantiated. More details on the GatewayClass [official documentation](https://gateway-api.sigs.k8s.io/gatewayclass/). The `GatewayClass` should be declared by the infrastructure provider, otherwise please register the `GatewayClass` [definition](../../reference/dynamic-configuration/kubernetes-gateway.md#definitions) in the Kubernetes cluster before creating `GatewayClass` objects. !!! info "Declaring GatewayClass" ```yaml kind: GatewayClass apiVersion: networking.x-k8s.io/v1alpha1 metadata: name: my-gateway-class spec: # Controller is a domain/path string that indicates # the controller that is managing Gateways of this class. controller: traefik.io/gateway-controller ``` ### Kind: `Gateway` A `Gateway` is 1:1 with the life cycle of the configuration of infrastructure. When a user creates a Gateway, some load balancing infrastructure is provisioned or configured by the GatewayClass controller. More details on the Gateway [official documentation](https://gateway-api.sigs.k8s.io/gateway/). Register the `Gateway` [definition](../../reference/dynamic-configuration/kubernetes-gateway.md#definitions) in the Kubernetes cluster before creating `Gateway` objects. !!! info "Declaring Gateway" ``` kind: Gateway apiVersion: networking.x-k8s.io/v1alpha1 metadata: name: my-gateway namespace: default spec: gatewayClassName: my-gateway-class # [1] listeners: # [2] - protocol: HTTPS # [3] port: 443 # [4] tls: # [5] certificateRef: # [6] group: "core" kind: "Secret" name: "mysecret" routes: # [7] kind: HTTPRoute # [8] selector: # [9] matchLabels: # [10] app: foo ``` | Ref | Attribute | Description | |------|--------------------|-----------------------------------------------------------------------------------------------------------------------------| | [1] | `gatewayClassName` | GatewayClassName used for this Gateway. This is the name of a GatewayClass resource. | | [2] | `listeners` | Logical endpoints that are bound on this Gateway's addresses. At least one Listener MUST be specified. | | [3] | `protocol` | The network protocol this listener expects to receive (only HTTP and HTTPS are implemented). | | [4] | `port` | The network port. | | [5] | `tls` | TLS configuration for the Listener. This field is required if the Protocol field is "HTTPS" or "TLS" and ignored otherwise. | | [6] | `certificateRef` | The reference to Kubernetes object that contains a TLS certificate and private key. | | [7] | `routes` | A schema for associating routes with the Listener using selectors. | | [8] | `kind` | The kind of the referent. | | [9] | `selector` | Routes in namespaces selected by the selector may be used by this Gateway routes to associate with the Gateway. | | [10] | `matchLabels` | A set of route labels used for selecting routes to associate with the Gateway. | ### Kind: `HTTPRoute` `HTTPRoute` defines HTTP rules for mapping requests from a `Gateway` to Kubernetes Services. Register the `HTTPRoute` [definition](../../reference/dynamic-configuration/kubernetes-gateway.md#definitions) in the Kubernetes cluster before creating `HTTPRoute` objects. !!! info "Declaring HTTPRoute" ```yaml kind: HTTPRoute apiVersion: networking.x-k8s.io/v1alpha1 metadata: name: http-app-1 namespace: default labels: # [1] app: foo spec: hostnames: # [2] - "whoami" rules: # [3] - matches: # [4] - path: # [5] type: Exact # [6] value: /bar # [7] - headers: # [8] type: Exact # [9] values: # [10] - foo: bar forwardTo: # [11] - serviceName: whoami # [12] weight: 1 # [13] port: 80 # [14] - backendRef: # [15] group: traefik.containo.us # [16] kind: TraefikService # [17] name: api@internal # [18] port: 80 weight: 1 ``` | Ref | Attribute | Description | |------|---------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [1] | `labels` | Labels to match with the `Gateway` labelselector. | | [2] | `hostnames` | A set of hostname that should match against the HTTP Host header to select a HTTPRoute to process the request. | | [3] | `rules` | A list of HTTP matchers, filters and actions. | | [4] | `matches` | Conditions used for matching the rule against incoming HTTP requests. Each match is independent, i.e. this rule will be matched if **any** one of the matches is satisfied. | | [5] | `path` | An HTTP request path matcher. If this field is not specified, a default prefix match on the "/" path is provided. | | [6] | `type` | Type of match against the path Value (supported types: `Exact`, `Prefix`). | | [7] | `value` | The value of the HTTP path to match against. | | [8] | `headers` | Conditions to select a HTTP route by matching HTTP request headers. | | [9] | `type` | Type of match for the HTTP request header match against the `values` (supported types: `Exact`). | | [10] | `values` | A map of HTTP Headers to be matched. It MUST contain at least one entry. | | [11] | `forwardTo` | The upstream target(s) where the request should be sent. | | [12] | `serviceName` | The name of the referent service. | | [13] | `weight` | The proportion of traffic forwarded to a targetRef, computed as weight/(sum of all weights in targetRefs). | | [14] | `port` | The port of the referent service. | | [15] | `backendRef` | The BackendRef is a reference to a backend (API object within a known namespace) to forward matched requests to. If both BackendRef and ServiceName are specified, ServiceName will be given precedence. Only `TraefikService` is supported. | | [16] | `group` | Group is the group of the referent. Only `traefik.containo.us` value is supported. | | [17] | `kind` | Kind is kind of the referent. Only `TraefikService` value is supported. | | [18] | `name` | Name is the name of the referent. |