Certified Kubernetes Administrator (CKA) Practice Test

Kubernetes uses DNS names for pod-to-service communication, which is a critical aspect of its networking model. When a service is created in Kubernetes, it is assigned a DNS name that can be used by other pods to discover and communicate with it. This allows for seamless service discovery and connectivity within the cluster, as pods can reference services by their DNS names instead of needing to know the specific IP addresses of the service endpoint.

Using DNS names simplifies the dynamic nature of Kubernetes where pods can be created, destroyed, or scaled rapidly. Since pods may change their IP addresses, relying on DNS ensures that communication remains intact as long as the service name remains the same. Kubernetes automatically manages the DNS records for services, allowing for easy integration and connectivity among various components in the cluster.

In contrast, static IP configurations would be impractical in a dynamic environment like Kubernetes, where pods frequently change. Service Accounts are primarily used for authentication and authorization rather than communication. Environment variables can be used to provide service information to pods but do not facilitate the direct communication between pods and services as effectively as DNS.