Setting up a custom domain per Service

By default, Knative uses the {route}.{namespace}.{default-domain} fully qualified domain name for the Service, where default-domain is example.com. You are able to change the default-domain following the Setting up a custom domain guide.

This guide documents the process to use a custom FQDN for a Service, like my-service.example.com, created by @bsideup.

There is currently no official process to set up a custom domain per Service. The topic is being discussed here.

Edit using kubectl

  1. Edit the domainTemplate entry on the config-network configuration. You can find more information about it here:

    1. kubectl edit cm config-network --namespace knative-serving

    Replace the domainTemplate with the following (the spaces must be respected):

    1. [...]
    2. data:
    3.   [...]
    4.   domainTemplate: |-
    5.     {{if index .Annotations "custom-hostname" -}}
    6.       {{- index .Annotations "custom-hostname" -}}
    7.     {{else -}}
    8.       {{- .Name}}.{{.Namespace -}}
    9.     {{end -}}
    10.     .{{.Domain}}

    Save and close your editor.

Edit the Service

  1. In a Service definition, add the custom-hostname annotation:

    1. apiVersion: serving.knative.dev/v1
    2. kind: Service
    3. metadata:
    4.   name: hello-world
    5.   annotations:
    6.     # the Service FQDN will become hello-world.{default-domain}
    7.     custom-hostname: hello-world
    8. spec:
    9. [...]

    Apply your changes.

Verify the changes

  1. Verify that the Service was created with the specified hostname:
  1. kubectl get ksvc hello-world
  3. NAME          URL                              LATESTCREATED       LATESTREADY         READY   REASON
  4. hello-world   http://hello-world.example.com   hello-world-nfqh2   hello-world-nfqh2   True

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