CKAD — Custom Resources

Creating Custom Resources

Once the CRD is created, you can create instances (Custom Resources):

apiVersion: stable.example.com/v1
kind: Backup
metadata:
  name: daily-db-backup
  namespace: default
spec:
  database: postgres-main
  schedule: "0 2 * * *"
  retentionDays: 30

kubectl apply -f backup-instance.yaml
# Expected: backup.stable.example.com/daily-db-backup created

# List custom resources
kubectl get backups
# Expected:
# NAME               AGE
# daily-db-backup    5s

# Use the short name
kubectl get bk

# Describe a custom resource
kubectl describe backup daily-db-backup

# Get as YAML
kubectl get backup daily-db-backup -o yaml

Managing CRDs

# List all CRDs
kubectl get crd

# Get details
kubectl describe crd backups.stable.example.com

# Delete a CRD (this also deletes ALL custom resources of that type)
kubectl delete crd backups.stable.example.com

Warning: Deleting a CRD deletes all custom resources of that type. This is a destructive operation.

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