Microservices Containerization and Orchestration 3

Question 1

What Kubernetes object stores non-confidential configuration data as key-value pairs?

Accepted Answer

ConfigMap

Answer

A ConfigMap holds non-sensitive configuration data injected into Pods.

Question 2

Which Docker concept allows data to persist beyond a container's lifecycle?

Accepted Answer

Volume

Answer

Volumes store data outside the container's writable layer so it survives container removal.

Question 3

What does Kubernetes Horizontal Pod Autoscaler (HPA) adjust automatically?

Accepted Answer

The number of Pod replicas

Answer

HPA scales the replica count up or down based on observed metrics like CPU.

Question 4

Which Kubernetes object is best suited for stateful applications requiring stable network identities?

Accepted Answer

StatefulSet

Answer

A StatefulSet provides stable, unique network identifiers and ordered deployment for stateful apps.

Question 5

What is the role of a container registry such as Docker Hub?

Accepted Answer

To store and distribute container images

Answer

A registry stores container images and serves them for pulls and pushes.

Microservices Practice Test