Custom domain mapping - Configuring custom domains for Knative services | Serving

You can customize the domain for your Knative service by mapping a custom domain name that you own to a Knative service. To map a custom domain name to a custom resource (CR), you must create a DomainMapping CR that maps to an Addressable target CR, such as a Knative service or a Knative route.

Creating a custom domain mapping

Prerequisites

The OpenShift Serverless Operator and Knative Serving are installed on your cluster.
Install the OpenShift CLI (oc).
You have created a project or have access to a project with the appropriate roles and permissions to create applications and other workloads in OpenShift Container Platform.
You have created a Knative service and control a custom domain that you want to map to that service.

Your custom domain must point to the IP address of the OpenShift Container Platform cluster.

Procedure

Create a YAML file containing the DomainMapping CR in the same namespace as the target CR you want to map to:

apiVersion: serving.knative.dev/v1alpha1
kind: DomainMapping
metadata:
 name: <domain_name> (1)
 namespace: <namespace> (2)
spec:
 ref:
   name: <target_name> (3)
   kind: <target_type> (4)
   apiVersion: serving.knative.dev/v1

1	The custom domain name that you want to map to the target CR.
2	The namespace of both the `DomainMapping` CR and the target CR.
3	The name of the target CR to map to the custom domain.
4	The type of CR being mapped to the custom domain.

Example service domain mapping

apiVersion: serving.knative.dev/v1alpha1
kind: DomainMapping
metadata:
 name: example.com
 namespace: default
spec:
 ref:
   name: showcase
   kind: Service
   apiVersion: serving.knative.dev/v1

Example route domain mapping

apiVersion: serving.knative.dev/v1alpha1
kind: DomainMapping
metadata:
 name: example.com
 namespace: default
spec:
 ref:
   name: example-route
   kind: Route
   apiVersion: serving.knative.dev/v1

Apply the DomainMapping CR as a YAML file:
```
$ oc apply -f <filename>
```