Custom resources concept in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Custom Resource in Kubernetes?

A Custom Resource is a way to extend Kubernetes by adding your own API objects. It lets you define new types of resources beyond the built-in ones like Pods or Services.

beginner

What is a CustomResourceDefinition (CRD)?

A CRD is a Kubernetes object that defines a new Custom Resource type. It tells Kubernetes how to recognize and handle your custom objects.

beginner

How do Custom Resources help in Kubernetes?

They let you add new resource types to manage your own applications or infrastructure in Kubernetes, making it more flexible and powerful.

beginner

What command creates a CustomResourceDefinition from a YAML file?

kubectl apply -f your-crd-file.yaml

intermediate

Can you use Custom Resources without writing any code?

Yes, you can create and manage Custom Resources using YAML files and kubectl commands without writing code, but to add logic you might write controllers.

What does a CustomResourceDefinition (CRD) do in Kubernetes?

A Monitors cluster health

B Deletes existing Kubernetes resources

C Manages user access

D Defines a new resource type for Kubernetes

A CRD defines a new resource type so Kubernetes can understand and manage custom objects.

Which command applies a CustomResourceDefinition YAML file?

A kubectl delete crd

B kubectl get crd

C kubectl apply -f file.yaml

D kubectl describe crd

kubectl apply -f file.yaml creates or updates resources defined in the YAML file.

What is a main benefit of using Custom Resources?

A Improving network speed

B Extending Kubernetes with new resource types

C Reducing storage usage

D Automatically scaling nodes

Custom Resources let you add new resource types to Kubernetes for managing custom needs.

Can you manage Custom Resources without writing code?

A Yes, using YAML and kubectl

B Only through the Kubernetes dashboard

C Only with special plugins

D No, code is always required

You can create and manage Custom Resources using YAML files and kubectl commands.

What Kubernetes object lets you add logic to Custom Resources?

A Controller

B Pod

C Service

D Namespace

Controllers watch Custom Resources and add behavior or automation.

Explain what Custom Resources and CustomResourceDefinitions are in Kubernetes and why they are useful.

Think about how Kubernetes can be made to understand new types of objects.

Describe the steps to create and use a Custom Resource in a Kubernetes cluster.

Focus on the YAML files and kubectl commands involved.