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External DNS Operator configuration parameters

To customize the behavior of the External DNS Operator, configure the available parameters in the ExternalDNS custom resource (CR). By configuraing parameters, you can control how the Operator synchronizes services and routes with your external DNS provider.

External DNS Operator configuration parameters

To customize the behavior of the External DNS Operator, configure the available parameters in the ExternalDNS custom resource (CR). By configuring parameters, you can control how the Operator synchronizes services and routes with your external DNS provider.

Parameter Description

spec

Enables the type of a cloud provider.

spec:
  provider:
    type: AWS
    aws:
      credentials:
        name: aws-access-key

  • provider.type: Specifies available options such as AWS, Google Cloud, Azure, and Infoblox.

  • provider.aws.credentials.name: Specifies a secret name for your cloud provider.

zones

Enables you to specify DNS zones by their domains. If you do not specify zones, the ExternalDNS resource discovers all of the zones present in your cloud provider account.

zones:
- "<zone_id>"

  • <zone_id>: Specifies the name of DNS zones.

domains

Enables you to specify AWS zones by their domains. If you do not specify domains, the ExternalDNS resource discovers all of the zones present in your cloud provider account.

domains:
- filterType: Include
  matchType: Exact
  name: "myzonedomain1.com"
- filterType: Include
  matchType: Pattern
  pattern: ".*\\.otherzonedomain\\.com"

  • domains.filterType: Specifies that the ExternalDNS resource includes the domain name.

  • domains.matchType: Specifies that the domain matching has to be exact as opposed to regular expression match.

  • domains.name: Specifies the name of the domain.

  • filterType.matchType: Specifies the regex-domain-filter flag in the ExternalDNS resource. You can limit possible domains by using a Regex filter.

  • filterType.pattern: Specifies the regex pattern to be used by the ExternalDNS resource to filter the domains of the target zones.

source

Enables you to specify the source for the DNS records, Service or Route.

source:
  type: Service
  service:
    serviceType:
      - LoadBalancer
      - ClusterIP
  labelFilter:
    matchLabels:
      external-dns.mydomain.org/publish: "yes"
  hostnameAnnotation: "Allow"
  fqdnTemplate:
  - "{{.Name}}.myzonedomain.com"

  • source: Specifies the settings for the source of DNS records.

  • source.type: Specifies that the ExternalDNS CR uses the Service type as the source for creating DNS records.

  • service.serviceType: Specifies the service-type-filter flag in the ExternalDNS resource. The serviceType contains the following fields: default: LoadBalancer; expected: ClusterIP; NodePort; LoadBalancer; ExternalName.

  • service.labelFilter: Specifies that the controller considers only those resources that match with label filter.

  • hostnameAnnotation: Specifies that the default value for hostnameAnnotation is Ignore which instructs ExternalDNS to generate DNS records by using the templates specified in the field fqdnTemplates. When the value is Allow the DNS records get generated based on the value specified in the external-dns.alpha.kubernetes.io/hostname annotation.

  • fqdnTemplate: Specifies that the External DNS Operator uses a string to generate DNS names from sources that do not define a hostname, or to add a hostname suffix when paired with the fake source.

source:
  type: OpenShiftRoute
  openshiftRouteOptions:
    routerName: default
    labelFilter:
      matchLabels:
        external-dns.mydomain.org/publish: "yes"

  • source.type: Specifies the creation of DNS records.

  • openshiftRouteOptions.routerName: Specifies if the source type is OpenShiftRoute. If so, you can pass the Ingress Controller name. The ExternalDNS resource uses the canonical name of the Ingress Controller as the target for CNAME records.