2V0-71.23 Question 109
Select 3A Kubernetes cluster managed by VMware Tanzu uses External DNS to integrate with a cloud DNS provider. Which of the following functionalities is provided by External DNS in this scenario?
- A
Automatically creates DNS records for Kubernetes Services with specific annotations.
- B
Provides an internal DNS resolver for resolving pod-to-pod communication within the cluster.
- C
Updates DNS records dynamically when the IP address of a Kubernetes Service changes.
- D
Manages SSL/TLS certificates for Kubernetes Ingress resources.
- E
Enables external clients to resolve cluster service endpoints using friendly DNS names.
Show answer and explanation
Correct answers: A, C, E
Explanation
External DNS is used in Kubernetes environments to automatically create and manage DNS records for services exposed to external networks. It integrates with cloud DNS providers to ensure that DNS entries are kept up to date as the cluster resources change, such as when a Service's IP address is updated. This functionality is crucial for enabling external access to Kubernetes workloads by using friendly DNS names.
- A. Correct.
Correct: External DNS can automatically create DNS records for Kubernetes Services that are annotated with specific metadata, enabling DNS integration with external providers.
- B. Incorrect.
Incorrect: Internal DNS resolution for pod-to-pod communication is handled by CoreDNS, not External DNS.
- C. Correct.
Correct: External DNS dynamically updates DNS records to reflect changes in the IP addresses of Kubernetes Services, ensuring DNS entries remain accurate.
- D. Incorrect.
Incorrect: Managing SSL/TLS certificates is typically handled by cert-manager or ingress controllers, not by External DNS.
- E. Correct.
Correct: External DNS allows external clients to resolve Kubernetes service endpoints using human-readable DNS names instead of direct IPs.