Skip to content
CKADApplication Environment, Configuration and SecuritySingle nodeEasy

Use a CustomResourceDefinition

Scenario ckad-env-005 · about 6 minutes · 8 points · 8 grader checks

Discover the schema of a custom resource and create and update objects of that kind with kubectl.

  • crd
  • custom-resource
  • api-resources
  • kubectl-explain

What you will practise

  • Discover custom resources with kubectl api-resources
  • Read a custom resource schema with kubectl explain
  • Create and patch custom objects

Start this lab

With the CLI installed and signed in, this command provisions a single node cluster on your Mac, applies the scenario setup and prints the task below.

goldenkube start ckad-env-005

Task

The task text exactly as the CLI shows it. Solve it on the cluster, then run goldenkube submit.

The cluster has a CustomResourceDefinition for the kind "Backup" in the API group "ops.goldenkube.dev". Namespace "crd-app" already contains one Backup object named "legacy". 1. Find out which fields a Backup accepts, then create a Backup named "nightly" in namespace "crd-app" that runs on the schedule "0 2 * * *", keeps 7 copies (retention) and targets "orders-db". Give it the label team=platform. 2. Change the retention of the existing Backup "legacy" to 14 without deleting it.

Requirements and details

Certification
CKAD · Certified Kubernetes Application Developer
Domain
Application Environment, Configuration and Security
Difficulty
Easy
Cluster topology
Single node
Cluster features
None beyond the base cluster
Recommended time
6 minutes
Points
8
Grader checks
8
Kubernetes version
1.37
Minimum CLI version
0.1.0
Scenario version
1
Published

Grading runs locally: 8 state checks read your cluster when you submit; the scenario passes when every check passes. Hints, the reference solution and the check definitions are available only inside the CLI, not on this page.

Install the CLICreate a free account

More Application Environment, Configuration and Security labs

CKADApplication Environment, Configuration and SecurityEasy

ConfigMap and Secret as env vars and a volume

Create a ConfigMap and a Secret and consume them in a Pod as single env vars, envFrom and a mounted volume.

Single node · ~7 min · 9 points

  • configmap
  • secret
  • env
  • envfrom
  • volumes

goldenkube start ckad-env-001

CKADApplication Environment, Configuration and SecurityMedium

Pod and container SecurityContext

Run a Pod as a non-root user with a read-only root filesystem, no privilege escalation and no capabilities.

Single node · ~7 min · 11 points

  • securitycontext
  • runasnonroot
  • capabilities
  • readonlyrootfilesystem
  • pod

goldenkube start ckad-env-002

CKADApplication Environment, Configuration and SecurityMedium

Requests, limits, LimitRange and ResourceQuota

Constrain a namespace with a ResourceQuota and LimitRange defaults, then deploy a workload that fits inside them.

Single node · ~8 min · 10 points

  • resources
  • requests
  • limits
  • resourcequota
  • limitrange

goldenkube start ckad-env-003

CKADApplication Environment, Configuration and SecurityMedium

ServiceAccount with least-privilege RBAC for an app

Give an application its own ServiceAccount with a namespaced Role and switch a running Deployment to it.

Single node · ~8 min · 10 points

  • serviceaccount
  • rbac
  • role
  • rolebinding
  • deployment

goldenkube start ckad-env-004

Independent community project, not affiliated with or endorsed by CNCF or The Linux Foundation. Lab results are practice feedback, not an exam score.