Custom resources concept in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Custom Resource Definition (CRD) with the correct API version.

Kubernetes

apiVersion: [1]
kind: CustomResourceDefinition
metadata:
  name: widgets.example.com

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

Acore/v1

Bv1

Capps/v1

Dapiextensions.k8s.io/v1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'v1' or 'core/v1' which are for core Kubernetes resources.

Using 'apps/v1' which is for deployments and similar resources.

The correct API version for defining a CustomResourceDefinition is apiextensions.k8s.io/v1.

2fill in blank

medium

Complete the code to specify the kind of the custom resource in the CRD spec.

Kubernetes

spec:
  group: example.com
  versions:
  - name: v1
    served: true
    storage: true
  scope: Namespaced
  names:
    plural: widgets
    singular: widget
    kind: [1]

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

AWidget

Bwidgets

CWidgetList

Dwidget

Attempts:

3 left

💡 Hint

Common Mistakes

Using plural or lowercase names for the kind.

Confusing kind with plural or singular names.

The kind field should be the singular, PascalCase name of the custom resource, here Widget.

3fill in blank

hard

Fix the error in the command to create a custom resource from a YAML file named 'widget.yaml'.

Kubernetes

kubectl [1] -f widget.yaml

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

Aapply

Brun

Ccreate

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'run' which is for running pods or containers.

Using 'delete' which removes resources.

Using 'apply' which can update existing resources but may not be ideal for initial creation.

To create a custom resource from a YAML file, the correct command is kubectl create -f widget.yaml.

4fill in blank

hard

Fill both blanks to define a Custom Resource Definition with the correct scope and plural name.

Kubernetes

spec:
  scope: [1]
  names:
    plural: [2]

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

ANamespaced

BCluster

Cwidgets

Dwidget

Attempts:

3 left

💡 Hint

Common Mistakes

Using singular for plural name.

Confusing 'Cluster' and 'Namespaced' scope.

The scope should be Namespaced for resources limited to namespaces, and the plural name should be the plural form, here widgets.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that filters custom resources with replicas greater than 3.

Kubernetes

filtered = {cr['metadata']['name']: cr['spec']['replicas'] for cr in resources if cr['spec']['replicas'] [1] [2]

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

A>

B3

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using equality or less than operators.

Using the wrong number for comparison.

The comprehension filters resources where replicas is greater than 3, so the operator is > and the number is 3.