CKA ConfigMaps and Secrets

Question 1

Which kubectl command creates a ConfigMap named 'app-config' with a literal key-value pair 'ENV=production'?

Accepted Answer

kubectl create configmap app-config --from-literal=ENV=production

Answer

kubectl create configmap app-config --literal ENV=production

Answer

kubectl apply configmap app-config --key=ENV --value=production

Answer

kubectl new configmap app-config ENV=production

Question 2

How do you expose all key-value pairs from a ConfigMap named 'app-config' as environment variables in a Pod?

Accepted Answer

Use envFrom with configMapRef specifying the ConfigMap name

Answer

Use env with configMapKeyRef for each individual key

Answer

Mount the ConfigMap as a volume and source the file

Answer

Use valueFrom with configMapRef in the container spec

Question 3

A ConfigMap is mounted as a volume in a Pod. After the ConfigMap is updated, what happens to the files inside the running Pod?

Accepted Answer

The files are eventually updated automatically by the kubelet

Answer

The Pod must be restarted for changes to take effect

Answer

The files are updated immediately and synchronously

Answer

The volume becomes read-only and cannot reflect changes

Question 4

Which kubectl command creates a ConfigMap from all files in a directory named 'configs/'?

Accepted Answer

kubectl create configmap my-config --from-file=configs/

Answer

kubectl create configmap my-config --from-dir=configs/

Answer

kubectl create configmap my-config --directory=configs/

Answer

kubectl create configmap my-config --files=configs/

Question 5

What is the maximum data size allowed in a single Kubernetes ConfigMap?

Accepted Answer

1 MiB

Answer

10 MiB

Answer

512 KiB

Answer

Unlimited

Question 6

How do you reference a single key 'DB_HOST' from a ConfigMap named 'db-config' as an environment variable in a container?

Accepted Answer

Use env with valueFrom.configMapKeyRef specifying the ConfigMap name and key

Answer

Use envFrom with configMapRef and a keySelector field

Answer

Use env with configMapRef and specify the key as a prefix

Answer

Use volumes with configMap and the key as a subPath

Question 7

What field do you set on a ConfigMap to prevent any future modifications to its data?

Accepted Answer

immutable: true

Answer

readOnly: true

Answer

locked: true

Answer

frozen: true