kubernetes/kops · error

determining challenge endpoint for node %q

Error message

determining challenge endpoint for node %q

What it means

Post-collection guard in VerifyToken: the node bootstrap challenge requires an HTTP challenge endpoint served on the node's private IP, but none was derived from the collected endpoints. Fires when privateIPEndpoints returned no challenge endpoints, making node-identity challenge verification impossible.

Source

Thrown at upup/pkg/fi/cloudup/azure/verifier.go:224

		ni, err := a.client.nisClient.GetVirtualMachineScaleSetNetworkInterface(ctx, a.client.resourceGroup, vmssName, vmssIndex, vmssName, nil)
		if err != nil {
			return nil, fmt.Errorf("getting info for %s network interface: %w", desc, err)
		}
		addrs, challengeEndpoints, err = privateIPEndpoints(ni.Interface, desc)
		if err != nil {
			return nil, err
		}

	default:
		return nil, fmt.Errorf("unsupported resource type %q", resourceType)
	}

	// Validate that we found at least one address and challenge endpoint.
	if len(addrs) == 0 {
		return nil, fmt.Errorf("determining certificate alternate names for node %q", nodeName)
	}
	if len(challengeEndpoints) == 0 {
		return nil, fmt.Errorf("determining challenge endpoint for node %q", nodeName)
	}

	result := &bootstrap.VerifyResult{
		NodeName:          nodeName,
		InstanceGroupName: igName,
		CertificateNames:  addrs,
		ChallengeEndpoint: challengeEndpoints[0],
	}

	klog.V(2).Infof("Azure verifier for VM %q verified as node %q in instance group %q", vmLogID, nodeName, igName)
	return result, nil
}

// extractNodeIdentity cross-verifies the attested vmId against the Azure API vmId for the claimed resource and
// extracts the node name and instance group from the API object. desc is a human-readable resource description
// used in errors and logs.
func extractNodeIdentity(data *attestedData, desc string, apiVMID *string, osProfile *compute.OSProfile, tags map[string]*string) (nodeName, igName string, err error) {
	if apiVMID == nil {

View on GitHub (pinned to 4c8573c808)

Solutions

1. Verify the node's private IP is reachable and the challenge server (kops-controller/nodeup) is running
2. Check that the NIC IP configuration exposes a private IPv4 address
3. Re-run node bootstrap after networking on the instance is healthy

When it happens

Trigger: Thrown at upup/pkg/fi/cloudup/azure/verifier.go:224 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/61792e7c48538eba. Report an issue: GitHub.