272 lines
8.2 KiB
Markdown
272 lines
8.2 KiB
Markdown
---
|
|
title: "Traefik Kubernetes Gateway API Documentation"
|
|
description: "Learn how to use the Kubernetes Gateway API as a provider for configuration discovery in Traefik Proxy. Read the technical documentation."
|
|
---
|
|
|
|
# Traefik & Kubernetes with Gateway API
|
|
|
|
The Kubernetes Gateway API, The Experimental Way.
|
|
{: .subtitle }
|
|
|
|
Gateway API is the evolution of Kubernetes APIs that relate to `Services`, such as `Ingress`.
|
|
The Gateway API project is part of Kubernetes, working under SIG-NETWORK.
|
|
|
|
The Kubernetes Gateway provider is a Traefik implementation of the [Gateway API](https://gateway-api.sigs.k8s.io/)
|
|
specifications from the Kubernetes Special Interest Groups (SIGs).
|
|
|
|
This provider is proposed as an experimental feature and partially supports the Gateway API [v0.4.0](https://github.com/kubernetes-sigs/gateway-api/releases/tag/v0.4.0) specification.
|
|
|
|
!!! warning "Enabling The Experimental Kubernetes Gateway Provider"
|
|
|
|
Since this provider is still experimental, it needs to be activated in the experimental section of the static configuration.
|
|
|
|
```yaml tab="File (YAML)"
|
|
experimental:
|
|
kubernetesGateway: true
|
|
|
|
providers:
|
|
kubernetesGateway: {}
|
|
#...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[experimental]
|
|
kubernetesGateway = true
|
|
|
|
[providers.kubernetesGateway]
|
|
#...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--experimental.kubernetesgateway=true --providers.kubernetesgateway=true #...
|
|
```
|
|
|
|
## Configuration Requirements
|
|
|
|
!!! tip "All Steps for a Successful Deployment"
|
|
|
|
* Add/update the Kubernetes Gateway API [definitions](../reference/dynamic-configuration/kubernetes-gateway.md#definitions).
|
|
* Add/update the [RBAC](../reference/dynamic-configuration/kubernetes-gateway.md#rbac) for the Traefik custom resources.
|
|
* Add all needed Kubernetes Gateway API [resources](../reference/dynamic-configuration/kubernetes-gateway.md#resources).
|
|
|
|
## Examples
|
|
|
|
??? example "Kubernetes Gateway Provider Basic Example"
|
|
|
|
```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="Gateway API CRDs"
|
|
# All resources definition must be declared
|
|
--8<-- "content/reference/dynamic-configuration/gateway.networking.k8s.io_gatewayclasses.yaml"
|
|
--8<-- "content/reference/dynamic-configuration/gateway.networking.k8s.io_gateways.yaml"
|
|
--8<-- "content/reference/dynamic-configuration/gateway.networking.k8s.io_httproutes.yaml"
|
|
```
|
|
|
|
```yaml tab="RBAC"
|
|
--8<-- "content/reference/dynamic-configuration/kubernetes-gateway-rbac.yml"
|
|
```
|
|
|
|
The Kubernetes Gateway API project provides several guides on how to use the APIs.
|
|
These guides can help you to go further than the example above.
|
|
The [getting started guide](https://gateway-api.sigs.k8s.io/v1alpha2/guides/) details how to install the CRDs from their repository.
|
|
|
|
!!! note ""
|
|
|
|
Keep in mind that the Traefik Gateway provider only supports the `v0.4.0` (v1alpha2).
|
|
|
|
For now, the Traefik Gateway Provider can be used while following the below guides:
|
|
|
|
* [Simple Gateway](https://gateway-api.sigs.k8s.io/v1alpha2/guides/simple-gateway/)
|
|
* [HTTP routing](https://gateway-api.sigs.k8s.io/v1alpha2/guides/http-routing/)
|
|
* [TLS](https://gateway-api.sigs.k8s.io/v1alpha2/guides/tls/)
|
|
|
|
## Resource Configuration
|
|
|
|
When using Kubernetes Gateway API as a provider, Traefik uses Kubernetes
|
|
[Custom Resource Definitions](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/)
|
|
to retrieve its routing configuration.
|
|
|
|
All concepts can be found in the official API concepts [documentation](https://gateway-api.sigs.k8s.io/concepts/api-overview/).
|
|
Traefik implements the following resources:
|
|
|
|
* `GatewayClass` defines a set of Gateways that share a common configuration and behaviour.
|
|
* `Gateway` describes how traffic can be translated to Services within the cluster.
|
|
* `HTTPRoute` defines HTTP rules for mapping requests from a Gateway to Kubernetes Services.
|
|
* `TCPRoute` defines TCP rules for mapping requests from a Gateway to Kubernetes Services.
|
|
* `TLSRoute` defines TLS rules for mapping requests from a Gateway to Kubernetes Services.
|
|
|
|
## Provider Configuration
|
|
|
|
### `endpoint`
|
|
|
|
_Optional, Default=""_
|
|
|
|
The Kubernetes server endpoint URL.
|
|
|
|
When deployed into Kubernetes, Traefik reads the environment variables `KUBERNETES_SERVICE_HOST` and `KUBERNETES_SERVICE_PORT` or `KUBECONFIG` to construct the endpoint.
|
|
|
|
The access token is looked up in `/var/run/secrets/kubernetes.io/serviceaccount/token` and the SSL CA certificate in `/var/run/secrets/kubernetes.io/serviceaccount/ca.crt`.
|
|
Both are mounted automatically when deployed inside Kubernetes.
|
|
|
|
The endpoint may be specified to override the environment variable values inside a cluster.
|
|
|
|
When the environment variables are not found, Traefik tries to connect to the Kubernetes API server with an external-cluster client.
|
|
In this case, the endpoint is required.
|
|
Specifically, it may be set to the URL used by `kubectl proxy` to connect to a Kubernetes cluster using the granted authentication and authorization of the associated kubeconfig.
|
|
|
|
```yaml tab="File (YAML)"
|
|
providers:
|
|
kubernetesGateway:
|
|
endpoint: "http://localhost:8080"
|
|
# ...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[providers.kubernetesGateway]
|
|
endpoint = "http://localhost:8080"
|
|
# ...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--providers.kubernetesgateway.endpoint=http://localhost:8080
|
|
```
|
|
|
|
### `token`
|
|
|
|
_Optional, Default=""_
|
|
|
|
Bearer token used for the Kubernetes client configuration.
|
|
|
|
```yaml tab="File (YAML)"
|
|
providers:
|
|
kubernetesGateway:
|
|
token: "mytoken"
|
|
# ...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[providers.kubernetesGateway]
|
|
token = "mytoken"
|
|
# ...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--providers.kubernetesgateway.token=mytoken
|
|
```
|
|
|
|
### `certAuthFilePath`
|
|
|
|
_Optional, Default=""_
|
|
|
|
Path to the certificate authority file.
|
|
Used for the Kubernetes client configuration.
|
|
|
|
```yaml tab="File (YAML)"
|
|
providers:
|
|
kubernetesGateway:
|
|
certAuthFilePath: "/my/ca.crt"
|
|
# ...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[providers.kubernetesGateway]
|
|
certAuthFilePath = "/my/ca.crt"
|
|
# ...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--providers.kubernetesgateway.certauthfilepath=/my/ca.crt
|
|
```
|
|
|
|
### `namespaces`
|
|
|
|
_Optional, Default: []_
|
|
|
|
Array of namespaces to watch.
|
|
If left empty, Traefik watches all namespaces.
|
|
|
|
```yaml tab="File (YAML)"
|
|
providers:
|
|
kubernetesGateway:
|
|
namespaces:
|
|
- "default"
|
|
- "production"
|
|
# ...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[providers.kubernetesGateway]
|
|
namespaces = ["default", "production"]
|
|
# ...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--providers.kubernetesgateway.namespaces=default,production
|
|
```
|
|
|
|
### `labelselector`
|
|
|
|
_Optional, Default: ""_
|
|
|
|
A label selector can be defined to filter on specific GatewayClass objects only.
|
|
If left empty, Traefik processes all GatewayClass objects in the configured namespaces.
|
|
|
|
See [label-selectors](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors) for details.
|
|
|
|
```yaml tab="File (YAML)"
|
|
providers:
|
|
kubernetesGateway:
|
|
labelselector: "app=traefik"
|
|
# ...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[providers.kubernetesGateway]
|
|
labelselector = "app=traefik"
|
|
# ...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--providers.kubernetesgateway.labelselector="app=traefik"
|
|
```
|
|
|
|
### `throttleDuration`
|
|
|
|
_Optional, Default: 0_
|
|
|
|
The `throttleDuration` option defines how often the provider is allowed to handle events from Kubernetes. This prevents
|
|
a Kubernetes cluster that updates many times per second from continuously changing your Traefik configuration.
|
|
|
|
If left empty, the provider does not apply any throttling and does not drop any Kubernetes events.
|
|
|
|
The value of `throttleDuration` should be provided in seconds or as a valid duration format,
|
|
see [time.ParseDuration](https://golang.org/pkg/time/#ParseDuration).
|
|
|
|
```yaml tab="File (YAML)"
|
|
providers:
|
|
kubernetesGateway:
|
|
throttleDuration: "10s"
|
|
# ...
|
|
```
|
|
|
|
```toml tab="File (TOML)"
|
|
[providers.kubernetesGateway]
|
|
throttleDuration = "10s"
|
|
# ...
|
|
```
|
|
|
|
```bash tab="CLI"
|
|
--providers.kubernetesgateway.throttleDuration=10s
|
|
```
|
|
|
|
{!traefik-for-business-applications.md!}
|