CKAD Multi-Container Pods and Init Containers 2

Question 1

What type of volume is created when a pod starts, lives as long as the pod, and is deleted when the pod is removed?

Accepted Answer

emptyDir

Answer

An emptyDir volume is created empty when the pod is scheduled, shared among containers, and deleted when the pod is removed.

Question 2

An Init Container needs to clone a Git repo before the main app starts. Which volume type is best for sharing the cloned files?

Accepted Answer

emptyDir

Answer

An emptyDir volume is ideal for passing data from an init container to app containers since it's shared within the pod and cleaned up automatically.

Question 3

Which field in a pod spec lists init containers?

Accepted Answer

spec.initContainers

Answer

Init containers are defined under 'spec.initContainers', separate from 'spec.containers' where app containers are listed.

Question 4

In the Sidecar pattern, which describes the relationship between the sidecar and main container?

Accepted Answer

The sidecar enhances or extends the main container's functionality while running alongside it

Answer

A sidecar runs concurrently with the main container in the same pod, extending its capabilities (e.g., log shipping, proxying).

Question 5

What is a key difference between Init Containers and regular containers regarding running simultaneously?

Accepted Answer

Init containers run sequentially to completion before any app container starts

Answer

Init containers run one at a time in order and must complete successfully before the pod's main containers are started.

CKAD - Certified Kubernetes Application Developer Practice Test