Overview

Kong Dataplane instances can be configured in Konnect by means of the KonnectExtension resource. This resource can be used to provision isolated DataPlanes or pairs of ControlPlanes and DataPlanes. The KonnectExtension resource can be referenced by ControlPlanes, DataPlanes, or GatewayConfigurations from the extension point in their spec. Dedicated guides will guide you to through these kinds of setup.

Konnect ControlPlane reference

KonnectExtension can be attached to Konnect ControlPlanes of type Hybrid or KIC. This reference can be performed in two different ways: via Konnect ID or via Kubernetes object reference to an in cluster KonnectGatewayControlPlane.

Reference by Konnect ID

The Konnect ControlPlane can be referenced by its ID, without having any KonnectGatewayControlPlane resource deployed in the cluster. The ControlPlane ID can be fetched by the Konnect UI, in the ControlPlane page. Whit this configuration, the KonnectExtension object requires to have the konnect.configuration.authref field set, as follows in the snippet below:

spec:
  konnect:
    controlPlane:
      ref:
        type: konnectID
        konnectID: a6554c4c-79a6-4db7-b7a4-201c0cf746ba # The Konnect controlPlane ID
    configuration:
      authRef:
        name: konnect-api-auth # Reference to the KonnectAPIAuthConfiguration object

The authRef.name fields refers to an object of type KonnectAPIAuthConfiguration that needs to exist in the same namespace as the KonnectExtension. Such objects contains all the data (server, token, etc.) to interact with konnect.

Reference By Kubernetes object

Alternatively, the KonnectExtension can reference an object in the cluster. This reference allows to attach the DataPlanes to the Konnect ControlPlane via a local object (a.k.a. KonnectGatewayControlPlane). When this type of reference is used, the KonnectAPIAuthConfiguration data is inferred by the KonnectGatewayControlPlane objects. For this reason, it’s not possible to set the konnect.configuration.authref field in this scenario.

spec:
  konnect:
    controlPlane:
      ref:
        type: konnectNamespacedRef
        konnectNamespacedRef:
          name: gateway-control-plane # The KonnectGatewayControlPlane resource name

DataPlane authentication

The DataPlane, in order to be configured in Konnect, needs a client certificate. This certificate can be manually created and managed by the user, or automatically provisioned by KGO.

Manual certificate provisioning

In order to manually create and set up a certificate to be used for Konnect DataPlanes, you can perform type the following commands:

1. Generate a new certificate and key:

    openssl req -new -x509 -nodes -newkey rsa:2048 -subj "/CN=kongdp/C=US" -keyout ./tls.key -out ./tls.crt
   

2. Create a Kubernetes secret that contains the previously created certificate:

    kubectl create secret tls konnect-client-tls --cert=./tls.crt --key=./tls.key
   

3. Label the secret to tell KGO to reconcile it:

    kubectl label secret konnect-client-tls konghq.com/konnect-dp-cert=true
   

Once the secret containing your certificate has been created in the cluster, you can set up your KonnectExtension as follows:

spec:
  clientAuth:
    certificateSecret:
      provisioning: Manual
        secretRef:
          name: konnect-client-tls # The name of the secret containing your certificate

Automatic certificate provisioning

Alternatively, you can leave the certificate provisioning and management to KGO, which will take care of creating a new certificate, write it into a Kubernetes Secret and manage the Secret’s lifecycle on behalf of you. To do so, you can configure a KonnectExtension as follows:

spec:
  clientAuth:
    certificateSecret:
      provisioning: Automatic

or you can just leave the spec.clientAuth field empty, and the automatic provisioning will be automatically defaulted.

DataPlane labels

Multiple labels can be configured to the Konnect DataPlane via the following field:

spec:
  konnect:
    dataPlane:
      foo: bar
      foo2: bar2

Please note that the amount of labels that can be set on DataPlanes via KonnectExtension is limited to 5.