ITGSS Certified DevOps Engineer Practice Test

When a Service is created in Kubernetes, what entity is generated alongside it?

1. DNS entry

2. IP address

3. Container

4. Pod

The correct answer is: DNS entry

When a Service is created in Kubernetes, it automatically generates a DNS entry. This entry allows for easier access to the Service via a stable hostname rather than relying on the dynamic Pod IP addresses, which may change as Pods are started, stopped, or rescheduled. The DNS entry is part of Kubernetes' internal mechanisms, where it sets up an associated DNS record that maps the Service name to the appropriate IP address. This is crucial for microservices architecture where various services need to communicate with each other using their names, thus enhancing service discovery and orchestration. While the other entities, like an IP address, are also relevant components of a Service, the automatic generation of the DNS entry is specifically highlighted because it provides a more user-friendly way for different components in the cluster to connect. Moreover, while Services do route traffic to Pods and may have associated IP addresses, the primary role of DNS within this context is to facilitate connectivity in a more manageable manner, addressing the challenges posed by dynamic IPs in containerized environments.