hashicorp/terraform · error

Failed to configure: %s

Error message

Failed to configure: %s

What it means

The Kubernetes backend failed to construct its dynamic (secret) client from the rest config. KubernetesSecretClient() lazily calls dynamic.NewForConfig(b.config); if the config is invalid for the dynamic client this wraps the underlying error. It is distinct from the earlier kubeconfig-loading failure (error 269) in that the config object existed but could not be turned into a client.

Source

Thrown at internal/backend/remote-state/kubernetes/backend.go:254

	backendbase.Base

	// The fields below are set from configure
	kubernetesSecretClient dynamic.ResourceInterface
	kubernetesLeaseClient  coordinationv1.LeaseInterface
	config                 *restclient.Config
	namespace              string
	labels                 map[string]string
	nameSuffix             string
}

func (b Backend) KubernetesSecretClient() (dynamic.ResourceInterface, error) {
	if b.kubernetesSecretClient != nil {
		return b.kubernetesSecretClient, nil
	}

	client, err := dynamic.NewForConfig(b.config)
	if err != nil {
		return nil, fmt.Errorf("Failed to configure: %s", err)
	}

	b.kubernetesSecretClient = client.Resource(secretResource).Namespace(b.namespace)
	return b.kubernetesSecretClient, nil
}

func (b Backend) KubernetesLeaseClient() (coordinationv1.LeaseInterface, error) {
	if b.kubernetesLeaseClient != nil {
		return b.kubernetesLeaseClient, nil
	}

	client, err := kubernetes.NewForConfig(b.config)
	if err != nil {
		return nil, err
	}

	b.kubernetesLeaseClient = client.CoordinationV1().Leases(b.namespace)
	return b.kubernetesLeaseClient, nil

View on GitHub (pinned to c9def3e214)

Solutions

1. Read the wrapped error message (it usually names the bad field, e.g. 'expected to find... in PEM block') and fix that specific credential value.
2. Validate that cluster_ca_certificate, client_certificate, and client_key are complete PEM blocks.
3. Test the same connection with kubectl using the same kubeconfig/credentials to isolate whether the issue is config content.
4. If running in-cluster, confirm the service account token and CA mounts exist at /var/run/secrets/...

Example fix

# before - truncated CA cert breaks client construction
cluster_ca_certificate = <<EOT
-----BEGIN CERTIFICATE-----
MIIB...truncated
EOT

# after - supply the full PEM bundle
cluster_ca_certificate = file("/full/path/to/ca.crt")

# Validate the REST config parses into clients before Terraform uses it
kubectl --kubeconfig "$KUBECONFIG" get ns   # confirms base connectivity
# Validate PEM fields parse
openssl x509 -in ca.crt -noout             # CA
openssl x509 -in client.crt -noout         # client cert
openssl rsa -in client.key -check          # client key

When it happens

Trigger: Any backend operation that first needs the secret client (Workspaces, StateMgr, DeleteWorkspace) calls KubernetesSecretClient() at backend.go:247-258, and dynamic.NewForConfig returns an error, typically due to malformed TLS/auth data or an unsupported config shape.

Common situations: A malformed client_certificate/client_key PEM, a cluster_ca_certificate that is not valid PEM, an in-cluster config where the service-account token is missing, or a host URL scheme the dynamic client rejects.

Related errors

• secret_suffix must not end with '-<number>', got %q
• Failed to initialize kubernetes configuration: %s
• can't delete default state
• %v Additionally, unlocking the state in Kubernetes faile
• state is already unlocked

AI-assisted analysis of hashicorp/terraform@c9def3e214 (2026-08-07). Data as JSON: /api/errors/a34021711b3dcc0e. Report an issue: GitHub.