To edit a Custom Resource Definition (CRD) in a specific namespace in Kubernetes, you need to distinguish between Custom Resource Definitions (CRDs) and Custom Resources (CRs) created by those CRDs:
• CRDs: These define the schema for custom resources across the cluster and are not namespaced. They apply to the entire cluster.
• CRs: These are the actual resources created based on the CRD and can be namespaced depending on the CRD definition.
If you want to edit a Custom Resource (CR) in a specific namespace, follow these steps:
1. Check the Available CRDs
First, list all CRDs in your cluster to identify the one you're working with:
kubectl get crds
2. List Custom Resources in a Namespace
To find the resources defined by the CRD in a particular namespace:
kubectl get <crd-name> -n <namespace>
For example:
kubectl get myresources.mygroup.example.com -n mynamespace
3. Edit the Custom Resource
Once you identify the resource you want to edit:
kubectl edit <crd-name> <resource-name> -n <namespace>
Example:
kubectl edit myresources.mygroup.example.com myresource1 -n mynamespace
This opens the resource definition in your default text editor (e.g., vi or nano). After making changes, save and exit. Kubernetes will apply the changes immediately.
4. Editing the CRD (Cluster-wide)
If you actually need to edit the CRD itself (not the custom resource):
kubectl edit crd <crd-name>
Important Notes:
• CRDs are cluster-wide and cannot be scoped to a specific namespace.
• Editing a CRD affects all resources created from that CRD in the entire cluster.
5. Validate Changes
After editing, validate the changes to ensure they are applied:
kubectl get <crd-name> -n <namespace> -o yaml
If you edited the CRD:
kubectl get crd <crd-name> -o yaml
Tips
• Always back up the resource or CRD definition before editing:
• kubectl get <crd-name> <resource-name> -n <namespace> -o yaml > resource-backup.yaml
• Use kubectl apply -f with a modified YAML file for better control over updates.
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