kubernetes/kops · error

marshaling Azure cloud config: %w

Error message

marshaling Azure cloud config: %w

What it means

Thrown in AzureCloudConfig when encoding the Azure cloud-provider configuration struct (built by azure.BuildCloudConfig) to JSON fails. json.Marshal almost never fails on plain config structs; if it fires, the built config contains a value of an unsupported type (e.g. a channel, function, complex number, or a cycle introduced by a config field).

Source

Thrown at upup/pkg/fi/cloudup/template_functions.go:735

		// Azure reads its cloud config from the azure-cloud-provider Secret.
	default:
		argv = append(argv, "--cloud-config=/etc/kubernetes/cloud.config")
	}

	return argv, nil
}

// AzureCloudConfig returns the base64-encoded Azure cloud provider
// configuration. kOps publishes it in the azure-cloud-provider Secret, which the
// cloud-controller-manager and CSI drivers load via --cloud-config-secret-name.
func (tf *TemplateFunctions) AzureCloudConfig() (string, error) {
	config, err := azure.BuildCloudConfig(tf.Cluster)
	if err != nil {
		return "", err
	}
	data, err := json.Marshal(config)
	if err != nil {
		return "", fmt.Errorf("marshaling Azure cloud config: %w", err)
	}
	return base64.StdEncoding.EncodeToString(data), nil
}

// DNSControllerArgv returns the args to the DNS controller
func (tf *TemplateFunctions) DNSControllerArgv() ([]string, error) {
	cluster := tf.Cluster

	var argv []string

	// @check if the dns controller has custom configuration
	if cluster.Spec.ExternalDNS == nil {
		argv = append(argv, []string{"--watch-ingress=false"}...)

		klog.V(4).Infof("watch-ingress=false set on dns-controller")
	} else {
		// @check if the watch ingress is set
		var watchIngress bool

View on GitHub (pinned to 4c8573c808)

Solutions

1. Inspect the built Azure cloud config for unusual field types (cycles, func/chan fields) added by recent changes
2. Fix the azure.BuildCloudConfig output so it only contains JSON-serializable values
3. Capture the wrapped *json.MarshalerError details (type and field) to locate the offending value

When it happens

Trigger: Thrown at upup/pkg/fi/cloudup/template_functions.go:735 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/5339b48d0ebf6b3c. Report an issue: GitHub.