kubernetes/kops · error

building corev1 client: %w

Error message

building corev1 client: %w

What it means

NewMetalIPAMReconciler builds a typed corev1 client from the controller-runtime manager's REST config; this wraps that construction failing. Like other client builders, it is an internal setup error in the auth/transport configuration rather than a cluster interaction.

Source

Thrown at cmd/kops-controller/controllers/metalipam.go:45

	corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
	"k8s.io/klog/v2"
	kopsapi "k8s.io/kops/pkg/apis/kops/v1alpha2"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/manager"
)

// NewMetalIPAMReconciler is the constructor for a MetalIPAMReconciler
func NewMetalIPAMReconciler(ctx context.Context, mgr manager.Manager) (*MetalIPAMReconciler, error) {
	klog.Info("starting metal ipam controller")
	r := &MetalIPAMReconciler{
		client: mgr.GetClient(),
		log:    ctrl.Log.WithName("controllers").WithName("metal_ipam"),
	}

	coreClient, err := corev1client.NewForConfig(mgr.GetConfig())
	if err != nil {
		return nil, fmt.Errorf("building corev1 client: %w", err)
	}
	r.coreV1Client = coreClient

	return r, nil
}

// MetalIPAMReconciler observes Node objects, assigning their `PodCIDRs` from the instance's `ExternalIpv6`.
type MetalIPAMReconciler struct {
	// client is the controller-runtime client
	client client.Client

	// log is a logr
	log logr.Logger

	// coreV1Client is a client-go client for patching nodes
	coreV1Client *corev1client.CoreV1Client
}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Inspect the wrapped client-go error for the invalid config field
2. Verify kops-controller's credentials and REST config are valid
3. Restart the controller after fixing credential configuration

When it happens

Trigger: Thrown at cmd/kops-controller/controllers/metalipam.go:45 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/4e264cf934b55793. Report an issue: GitHub.