14.5. Securing a mapped service using a TLS certificate

Procedure

1. Create a Kubernetes TLS secret:

   $ oc create secret tls <tls_secret_name> --cert=<path_to_certificate_file> --key=<path_to_key_file>

2. Add the networking.internal.knative.dev/certificate-uid: <id>` label to the Kubernetes TLS secret:

   $ oc label secret <tls_secret_name> networking.internal.knative.dev/certificate-uid="<id>"

   If you are using a third-party secret provider such as cert-manager, you can configure your secret manager to label the Kubernetes TLS secret automatically. cert-manager users can use the secret template offered to automatically generate secrets with the correct label. In this case, secret filtering is done based on the key only, but this value can carry useful information such as the certificate ID that the secret contains.

   참고

   The cert-manager Operator for Red Hat OpenShift is a Technology Preview feature. For more information, see the Installing the cert-manager Operator for Red Hat OpenShift documentation.

3. Update the DomainMapping CR to use the TLS secret that you have created:

   apiVersion: serving.knative.dev/v1beta1
   kind: DomainMapping
   metadata:
     name: <domain_name>
     namespace: <namespace>
   spec:
     ref:
       name: <service_name>
       kind: Service
       apiVersion: serving.knative.dev/v1
   # TLS block specifies the secret to be used
     tls:
       secretName: <tls_secret_name>

Verification

1. Verify that the DomainMapping CR status is True, and that the URL column of the output shows the mapped domain with the scheme https:

   $ oc get domainmapping <domain_name>

   Example output

   NAME                      URL                               READY   REASON
   example.com               https://example.com               True

2. Optional: If the service is exposed publicly, verify that it is available by running the following command:

   $ curl https://<domain_name>

   If the certificate is self-signed, skip verification by adding the -k flag to the curl command.