Microservices Containerization and Orchestration 2

Question 1

In Kubernetes, which object ensures a specified number of identical Pod replicas are always running?

Accepted Answer

ReplicaSet

Answer

A ReplicaSet maintains a stable set of replica Pods running at any given time.

Question 2

What is the smallest deployable unit in Kubernetes?

Accepted Answer

Pod

Answer

A Pod is the smallest deployable unit and can contain one or more tightly coupled containers.

Question 3

Which Docker instruction sets the default command executed when a container starts?

Accepted Answer

CMD

Answer

CMD specifies the default command to run when the container launches.

Question 4

What does a Kubernetes Service of type ClusterIP provide?

Accepted Answer

An internal-only stable IP for Pods

Answer

ClusterIP exposes the Service on an internal IP reachable only within the cluster.

Question 5

Which command builds a Docker image from a Dockerfile in the current directory?

Accepted Answer

docker build .

Answer

docker build reads the Dockerfile and produces an image.

Microservices Practice Test