Configuring ExternalDNS

While CoreDNS serves as the internal DNS server for Kubernetes clusters, ExternalDNS is a Kubernetes add-on that is used to manage your cluster external DNS providers, including Route 53, AzureDNS, and Google Cloud DNS.

It makes Kubernetes deployments and services discoverable through public DNS services, such as Route 53. It queries the Kubernetes API to retrieve a list of services and ingresses, and then it communicates with the public DNS and registers these records.

ExternalDNS allows you to control DNS records (via cloud DNS services such as AWS Route 53 or Google Cloud DNS) dynamically via Kubernetes services and ingresses.

ExternalDNS does not come pre-installed with the cluster, so you need to deploy it and specify its configuration, which includes its Docker image, the number of replicas to run, DNS record syncing and interval updates, the cloud provider type (that is, AWS, Azure, and so on), and the hosted zone ID (in the case of AWS Route...