ExternalDNS in Kubernetes

ExternalDNS is a project that makes Kubernetes resources accessible through public DNS servers. It allows us to control DNS records dynamically through Kubernetes resources. It resolves the service’s hostname to the external IP address of the cluster. The latest release of ExternalDNS supports 30+ DNS providers, including Google Cloud DNS, AWS Route 53, AWS Cloud Map, AzureDNS, CloudFlare, and CoreDNS.

Benefits of using ExternalDNS

ExternalDNS offers advanced features like load balancing, automatic
Benefits of using ExternalDNSfailover, and enhanced security to protect against tampering attempts. It provides consistent infrastructure of DNS for all the applications and simplifies DNS management. ExternalDNS also provides scalability and flexibility.

ExternalDNS with Amazon EKS

Amazon Elastic Kubernetes Services is a service provided by AWS that allows customers to take full advantage of Kubernetes, along with integrating other services of Amazon.

When we create an EKS cluster and deploy an application, we make it accessible on the internet using the load balancer's alias (domain name).

There are multiple approaches to implementing ExternalDNS, such as using a load balancer, Route53, Cloud Map, and Kube Ingress. Here are the prerequisites that are needed in every approach:

IAM policy to update Route53 Resource Records Sets and Hosted Zones
EKS cluster
IAM roles for cluster and nodes
Service account for the load balancer
Route53 hosted zone

Note: It is always recommended to clean up the resources after use to avoid billing.

Unlock your potential: Kubernetes Essentials series, all in one place!

To deepen your understanding of Kubernetes, explore our series of Answers below:

What is Kubernetes?
Get an introduction to Kubernetes, the powerful container orchestration platform that automates deployment, scaling, and management of containerized applications.
What is Kubernetes Event-Driven Autoscaling (KEDA)?
Learn how KEDA enables event-driven scaling, allowing Kubernetes workloads to automatically scale based on external metrics such as message queues, databases, and cloud events.
Why do we use Kubernetes?
Understand the core benefits of Kubernetes, including automated deployment, scaling, and management of containerized applications across distributed environments.
What are Kubernetes namespaces?
Discover how Kubernetes namespaces help organize and isolate workloads within a cluster, enhancing security and resource allocation.
What are the different types of services in Kubernetes?
Explore the various Kubernetes service types—ClusterIP, NodePort, LoadBalancer, and ExternalName—and their roles in facilitating communication between applications.
ReplicationController in Kubernetes
Learn about the ReplicationController, its role in maintaining pod availability, and how it ensures that a specified number of pod replicas are always running.
ExternalDNS in Kubernetes
Understand how ExternalDNS simplifies service discovery by dynamically managing DNS records for Kubernetes services, making external access seamless.
What are taints and tolerations in Kubernetes?
Gain insights into taints and tolerations and how they control pod scheduling by preventing or allowing specific workloads to run on designated nodes.
Introduction to Node Affinity in Kubernetes
Discover how Node Affinity works in Kubernetes to influence pod scheduling by specifying node selection preferences and ensuring efficient workload distribution.