Creating DNS records on a public managed zone for GCP

Creating DNS records on a public managed zone for GCP

You can create DNS records on Google Cloud Platform (GCP) by using the External DNS Operator.

Using the External DNS Operator on a cluster with GCP Workload Identity enabled is not supported. For more information about the GCP Workload Identity, see Using manual mode with GCP Workload Identity.

You can create DNS records on a public managed zone for GCP by using the External DNS Operator.

Prerequisites

You must have administrator privileges.

Procedure

Copy the gcp-credentials secret in the encoded-gcloud.json file by running the following command:

$ oc get secret gcp-credentials -n kube-system --template='{{$v := index .data "service_account.json"}}{{$v}}' | base64 -d - > decoded-gcloud.json

Export your Google credentials by running the following command:
```
$ export GOOGLE_CREDENTIALS=decoded-gcloud.json
```

Activate your account by using the following command:

$ gcloud auth activate-service-account  <client_email as per decoded-gcloud.json> --key-file=decoded-gcloud.json

Set your project by running the following command:

$ gcloud config set project <project_id as per decoded-gcloud.json>

Get a list of routes by running the following command:

$ oc get routes --all-namespaces | grep console

Example output

openshift-console          console             console-openshift-console.apps.test.gcp.example.com                       console             https   reencrypt/Redirect     None
openshift-console          downloads           downloads-openshift-console.apps.test.gcp.example.com                     downloads           http    edge/Redirect          None

Get a list of managed zones by running the following command:

$ gcloud dns managed-zones list | grep test.gcp.example.com

Example output

qe-cvs4g-private-zone test.gcp.example.com

Create a YAML file, for example, external-dns-sample-gcp.yaml, that defines the ExternalDNS object:

Example external-dns-sample-gcp.yaml file

apiVersion: externaldns.olm.openshift.io/v1beta1
kind: ExternalDNS
metadata:
  name: sample-gcp (1)
spec:
  domains:
    - filterType: Include (2)
      matchType: Exact (3)
      name: test.gcp.example.com (4)
  provider:
    type: GCP (5)
  source:
    openshiftrouteOptions: (6)
      routerName: default (7)
    type: OpenShiftroute (8)

1	Specifies the External DNS name.
2	By default, all hosted zones are selected as potential targets. You can include your hosted zone.
3	The domain of the target must match the string defined by the `name` key.
4	Specify the exact domain of the zone you want to update. The hostname of the routes must be subdomains of the specified domain.
5	Defines the provider type.
6	You can define options for the source of DNS records.
7	If the source type is `OpenShiftroute`, you can pass the OpenShift Ingress Controller name. External DNS selects the canonical hostname of that router as the target while creating CNAME record.
8	Defines the `route` resource as the source for GCP DNS records.

Check the DNS records created for OKD routes by running the following command:

$ gcloud dns record-sets list --zone=qe-cvs4g-private-zone | grep console

Creating DNS records on GCP

Creating DNS records on a public managed zone for GCP