Kubernetes Dynamic Client Requires Plural Resource Type

Fri, 01 May 2026 00:00:00 +0000

In GoLang, in addition to invoking kubectl, an alternative approach to access CRDs on a Kubernetes cluster via Dynamic client. It allows users to access CRDs programmatically without exec module and kubectl, which requires handling shells, exit code and STDIN/STDOU. However, it seems the module is not well document. An general error type users encounter often is resource type not found related error, which could be triggered by the code:

func GetNetworkPolicy(ctx context.Context, client dynamic.Interface, policy string) error {
	gvr := schema.GroupVersionResource{
        Group:    "cilium.io",
        Version:  "v2",
        Resource: "ciliumclusterwidenetworkpolicy",
    }

    policy, err := client.Resource(gvr).Get(ctx, policy, metav1.GetOptions{})
    if err != nil {
        return fmt.Errof("Error getting policy: %v", err)
    }
	// ... snipped
}

The issue here is the resource type. I didn’t find documents mention that directly, but value ofResource member in the GroupVersionResource structure should be plural. To make code above work correctly, ciliumclusterwidenetworkpolicy should be ciliumclusterwidenetworkpolicies. This is different from writing K8s objects in yaml format which singular is used. By contrary, if the problem is target objects not found, then users should get errors like ciliumclusterwidenetworkpolicy not found.

GoLang on Hallblazzar: Dev Journal

Kubernetes Dynamic Client Requires Plural Resource Type