Feature flags in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a ConfigMap named 'feature-flags' with a key 'enableFeatureX' set to 'true'.

Kubernetes

apiVersion: v1
kind: ConfigMap
metadata:
  name: feature-flags
data:
  enableFeatureX: "[1]"

Drag options to blanks, or click blank then click option'

Atrue

Bfalse

Cenabled

Dyes

Attempts:

3 left

💡 Hint

Common Mistakes

Using boolean true without quotes causes YAML parsing errors.

Using 'enabled' or 'yes' instead of 'true' as string.

The value for the feature flag should be the string "true" to enable the feature.

2fill in blank

medium

Complete the command to apply the ConfigMap file named 'feature-flags.yaml' to the Kubernetes cluster.

Kubernetes

kubectl [1] -f feature-flags.yaml

Drag options to blanks, or click blank then click option'

Adelete

Bget

Ccreate

Dapply

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'create' will fail if the resource already exists.

Using 'delete' removes resources instead of creating or updating.

The kubectl apply command updates or creates resources from a file.

3fill in blank

hard

Fix the error in the Deployment YAML snippet to use the feature flag from the ConfigMap as an environment variable named FEATURE_X_ENABLED.

Kubernetes

env:
  - name: FEATURE_X_ENABLED
    valueFrom:
      configMapKeyRef:
        name: feature-flags
        [1]: enableFeatureX

Drag options to blanks, or click blank then click option'

AkeyRef

Bkey

CkeyName

DkeyFrom

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'keyName' or 'keyRef' causes Kubernetes to reject the manifest.

Using 'keyFrom' is not a valid field.

The correct field to reference a key in a ConfigMap is key.

4fill in blank

hard

Fill both blanks to create a Deployment environment variable that uses the feature flag 'enableFeatureY' from the ConfigMap named 'feature-flags'.

Kubernetes

env:
  - name: FEATURE_Y_ENABLED
    valueFrom:
      configMapKeyRef:
        name: [1]
        [2]: enableFeatureY

Drag options to blanks, or click blank then click option'

Afeature-flags

Bfeature-flags-prod

Ckey

DkeyRef

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong ConfigMap name.

Using 'keyRef' instead of 'key' for the key field.

The ConfigMap name is 'feature-flags' and the key field is 'key'.

5fill in blank

hard

Fill all three blanks to create a ConfigMap with two feature flags: 'enableFeatureA' set to 'true' and 'enableFeatureB' set to 'false'.

Kubernetes

apiVersion: v1
kind: ConfigMap
metadata:
  name: [1]
data:
  enableFeatureA: "[2]"
  enableFeatureB: "[3]"

Drag options to blanks, or click blank then click option'

Afeature-flags

Btrue

Cfalse

Dfeature-flags-prod

Attempts:

3 left

💡 Hint

Common Mistakes

Using boolean true/false without quotes.

Mixing up the feature flag values.

The ConfigMap name is 'feature-flags'. Feature A is enabled with 'true' and Feature B is disabled with 'false'.