Creating DNS records on an public managed zone for GCP - External DNS Operator | Networking

Creating DNS records on an public managed zone for GCP by using Red Hat External DNS Operator

You can create DNS records on GCP using External DNS Operator.

Creating DNS records on an public managed zone for GCP by using Red Hat External DNS Operator

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

Procedure

Check the user. The user must have access to the kube-system namespace. If you don’t have the credentials, as you can fetch the credentials from the kube-system namespace to use the cloud provider client:
```
$ oc whoami
```
Example output
```
system:admin
```

Copy the value of service_account.json in gcp-credentials secret in a file encoded-gcloud.json 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 Google credentials:

$ 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:

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

Get the routes to check the domain:

$ 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 the list of managed zones to find the zone which corresponds to the previously found route’s domain:

$ gcloud dns managed-zones list | grep test.gcp.example.com
qe-cvs4g-private-zone test.gcp.example.com

Create ExternalDNS resource for route source:

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)
EOF

1	Specifies the name of External DNS CR.
2	By default all hosted zones are selected as potential targets. You can include a hosted zone that you need.
3	The matching of the target zone’s domain has to be exact (as opposed to regular expression match).
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 Google Cloud DNS provider.
6	You can define options for the source of DNS records.
7	If the source is `OpenShiftRoute` then 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 OpenShift `route` resource as the source for the DNS records which gets created in the previously specified DNS provider.

Check the records created for OCP routes using the following command:

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

Creating DNS records on GCP

Creating DNS records on an public managed zone for GCP by using Red Hat External DNS Operator