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Custom Resource Definitions

The Ingress Controller can configure Kong specific features using several Custom Resource Definitions(CRDs).

Following CRDs enables users to declaratively configure all aspects of Kong:

• KongPlugin: This resource corresponds to the Plugin entity in Kong.
• KongIngress: This resource provides fine-grained control over all aspects of proxy behaviour like routing, load-balancing, and health checking. It serves as an “extension” to the Ingress resources in Kubernetes.
• KongConsumer: This resource maps to the Consumer entity in Kong.
• TCPIngress: This resource can configure TCP-based routing in Kong for non-HTTP services running inside Kubernetes.
• UDPIngress: This resource can configure UDP-based routing in Kong.
• KongCredential (Deprecated): This resource maps to a credential (key-auth, basic-auth, jwt, hmac-auth) that is associated with a specific KongConsumer.

KongPlugin

This resource provides an API to configure plugins inside Kong using Kubernetes-style resources.

Please see the concept document for how the resource should be used.

The following snippet shows the properties available in KongPlugin resource:

apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: <object name>
  namespace: <object namespace>
disabled: <boolean>  # optionally disable the plugin in Kong
config:              # configuration for the plugin
  key: value
configFrom:
  secretKeyRef:
     name: <Secret name>
     key: <Secret key>
plugin: <name-of-plugin> # like key-auth, rate-limiting etc

• config contains a list of key and value required to configure the plugin. All configuration values specific to the type of plugin go in here. Please read the documentation of the plugin being configured to set values in here. For any plugin in Kong, anything that goes in the config JSON key in the Admin API request, goes into the config YAML key in this resource. Please use a valid JSON to YAML convertor and place the content under the config key in the YAML above.
• configFrom contains a reference to a Secret and key, where the key contains a complete JSON or YAML configuration. This should be used when the plugin configuration contains sensitive information, such as AWS credentials in the Lambda plugin or the client secret in the OIDC plugin. Only one of config or configFrom may be used in a KongPlugin, not both at once.
• plugin field determines the name of the plugin in Kong. This field was introduced in Kong Ingress Controller 0.2.0.

Please note: validation of the configuration fields is left to the user by default. It is advised to setup and use the admission validating controller to catch user errors.

The plugins can be associated with Ingress or Service object in Kubernetes using konghq.com/plugins annotation.

Examples

Applying a plugin to a service

Given the following plugin:

apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: request-id
config:
  header_name: my-request-id
  echo_downstream: true
plugin: correlation-id

It can be applied to a service by annotating like:

apiVersion: v1
kind: Service
metadata:
  name: myapp-service
  labels:
     app: myapp-service
  annotations:
     konghq.com/plugins: request-id
spec:
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
    name: myapp-service
  selector:
    app: myapp-service

Applying a plugin to an ingress

The KongPlugin above can be applied to a specific ingress (route or routes):

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: demo-example-com
  annotations:
    konghq.com/plugins: request-id
spec:
  ingressClassName: kong
  rules:
  - host: example.com
    http:
      paths:
      - path: /bar
        pathType: ImplementationSpecific
        backend:
          service:
            name: echo
            port:
              number: 80

A plugin can also be applied to a specific KongConsumer by adding konghq.com/plugins annotation to the KongConsumer resource.

Please follow the Using the KongPlugin resource guide for details on how to use this resource.

Applying a plugin with a secret configuration

The plugin above can be modified to store its configuration in a secret:

apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: request-id
configFrom:
  secretKeyRef:
    name: plugin-conf-secret
    key: request-id
plugin: correlation-id

apiVersion: v1
kind: Secret
metadata:
  name: plugin-conf-secret
stringData:
  request-id: |
    header_name: my-request-id
    echo_downstream: true
type: Opaque

KongClusterPlugin

A KongClusterPlugin is same as KongPlugin resource. The only differences are that it is a Kubernetes cluster-level resource instead of a namespaced resource, and can be applied as a global plugin using labels.

Please consult the KongPlugin section for details.

Example:

KongClusterPlugin example:

apiVersion: configuration.konghq.com/v1
kind: KongClusterPlugin
metadata:
  name: request-id
  annotations:
    kubernetes.io/ingress.class: <controller ingress class, "kong" by default>
  labels:
    global: "true"   # optional, if set, then the plugin will be executed
                     # for every request that Kong proxies
                     # please note the quotes around true
config:
  header_name: my-request-id
configFrom:
    secretKeyRef:
       name: <Secret name>
       key: <Secret key>
       namespace: <Secret namespace>
plugin: correlation-id

As with KongPlugin, only one of config or configFrom can be used.

Setting the label global to "true" will apply the plugin globally in Kong, meaning it will be executed for every request that is proxied via Kong.

KongIngress

Note: Many fields available on KongIngress are also available as annotations. You can add these annotations directly to Service and Ingress resources without creating a separate KongIngress resource. When an annotation is available, it is the preferred means of configuring that setting, and the annotation value will take precedence over a KongIngress value if both set the same setting.

Ingress resource spec in Kubernetes can define routing policies based on HTTP Host header and paths. While this is sufficient in most cases, sometimes, users may want more control over routing at the Ingress level. KongIngress serves as an “extension” to Ingress resource. It is not meant as a replacement to the Ingress resource in Kubernetes.

Please read the concept document for why this resource exists and how it relates to the existing Ingress resource.

Using KongIngress, all properties of Upstream, Service, and Route entities in Kong related to an Ingress resource can be modified.

Once a KongIngress resource is created, it needs to be associated with an Ingress or Service resource using the following annotation:

konghq.com/override: kong-ingress-resource-name

Specifically,

• To override any properties related to health-checking, load-balancing, or details specific to a service, add the annotation to the Kubernetes Service that is being exposed via the Ingress API.
• To override routing configuration (like protocol or method based routing), add the annotation to the Ingress resource.

Please follow the Using the KongIngress resource guide for details on how to use this resource.

For reference, the following is a complete spec for KongIngress (for property documentation, see Upstream, Service and Route entities.

apiVersion: configuration.konghq.com/v1
kind: KongIngress
metadata:
  name: configuration-demo
upstream:
  slots: 10000
  hash_on: none
  hash_fallback: none
  healthchecks:
    threshold: 25
    active:
      concurrency: 10
      healthy:
        http_statuses:
        - 200
        - 302
        interval: 0
        successes: 0
      http_path: "/"
      timeout: 1
      unhealthy:
        http_failures: 0
        http_statuses:
        - 429
        interval: 0
        tcp_failures: 0
        timeouts: 0
    passive:
      healthy:
        http_statuses:
        - 200
        successes: 0
      unhealthy:
        http_failures: 0
        http_statuses:
        - 429
        - 503
        tcp_failures: 0
        timeouts: 0
proxy:
  protocol: http
  path: /
  connect_timeout: 10000
  retries: 10
  read_timeout: 10000
  write_timeout: 10000
route:
  methods:
  - POST
  - GET
  regex_priority: 0
  strip_path: false
  preserve_host: true
  protocols:
  - http
  - https

TCPIngress

The Ingress resource in Kubernetes is HTTP-only. This custom resource is modeled similar to the Ingress resource but for TCP and TLS SNI based routing purposes:

apiVersion: configuration.konghq.com/v1beta1
kind: TCPIngress
metadata:
  name: <object name>
  namespace: <object namespace>
  annotations:
    kubernetes.io/ingress.class: <controller ingress class, "kong" by default>
spec:
  rules:
  - host: <SNI, optional>
    port: <port on which to expose this service, required>
    backend:
      serviceName: <name of the kubernetes service, required>
      servicePort: <port number to forward on the service, required>

If host is not specified, then port-based TCP routing is performed. Kong doesn’t care about the content of TCP stream in this case.

If host is specified, then Kong expects the TCP stream to be TLS-encrypted and Kong will terminate the TLS session based on the SNI. Also note that, the port in this case should be configured with ssl parameter in Kong.

UDPIngress

The UDPIngress API makes it possible to route traffic to your UDP services using Kong (e.g. DNS, Game Servers, e.t.c.).

apiVersion: configuration.konghq.com/v1beta1
kind: UDPIngress
metadata:
  name: <object name>
  namespace: <object namespace>
  annotations:
    kubernetes.io/ingress.class: <controller ingress class, "kong" by default>
spec:
  rules:
  - port: <port on which to expose this service, required>
    backend:
      serviceName: <name of the kubernetes service, required>
      servicePort: <port number to forward on the service, required>

For each rule provided in the spec the Kong proxy environment must be updated to listen to UDP on that port as well.

KongConsumer

This custom resource configures a consumer in Kong:

The following snippet shows the field available in the resource:

apiVersion: configuration.konghq.com/v1
kind: KongConsumer
metadata:
  name: <object name>
  namespace: <object namespace>
  annotations:
    kubernetes.io/ingress.class: <controller ingress class, "kong" by default>
username: <user name>
custom_id: <custom ID>

An example:

apiVersion: configuration.konghq.com/v1
kind: KongConsumer
metadata:
  name: consumer-team-x
  annotations:
    kubernetes.io/ingress.class: kong
username: team-X
credentials:
  - secretRef1
  - secretRef2

When this resource is created, a corresponding consumer entity will be created in Kong.

Consumers’ username and custom_id values must be unique across the Kong cluster. While KongConsumers exist in a specific Kubernetes namespace, KongConsumers from all namespaces are combined into a single Kong configuration, and no KongConsumers with the same kubernetes.io/ingress.class may share the same username or custom_id value.

For help configuring credentials for the KongConsumer Please refer to the using the Kong Consumer and Credential resource guide.