kubernetes/kops · error

unable to parse %q as a url: %v

Error message

unable to parse %q as a url: %v

What it means

The default kOps distribution base URL (built from the kOps version) failed url.Parse while resolving nodeup/docker-asset locations. As with any malformed constant, this indicates a broken build/default rather than user input.

Source

Thrown at pkg/nodemodel/wellknownassets/kopsassets.go:53

var kopsBaseURL *url.URL

// BaseURL returns the base url for the distribution of kops - in particular for nodeup & docker images
func BaseURL() (*url.URL, error) {
	// returning cached value
	// Avoid repeated logging
	if kopsBaseURL != nil {
		klog.V(8).Infof("Using cached kopsBaseUrl url: %q", kopsBaseURL.String())
		return copyBaseURL(kopsBaseURL)
	}

	baseURLString := os.Getenv("KOPS_BASE_URL")
	var err error
	if baseURLString == "" {
		baseURLString = fmt.Sprintf(defaultKopsBaseURL, kops.Version)
		klog.V(8).Infof("Using default base url: %q", baseURLString)
		kopsBaseURL, err = url.Parse(baseURLString)
		if err != nil {
			return nil, fmt.Errorf("unable to parse %q as a url: %v", baseURLString, err)
		}
	} else {
		kopsBaseURL, err = url.Parse(baseURLString)
		if err != nil {
			return nil, fmt.Errorf("unable to parse env var KOPS_BASE_URL %q as a url: %v", baseURLString, err)
		}
		klog.Warningf("Using base url from env var: KOPS_BASE_URL=%q", baseURLString)

		// The last path component of KOPS_BASE_URL is the artifact version.
		// Override kops.Version so image tags in manifests match the sideloaded images.
		if v := path.Base(kopsBaseURL.Path); v != "" && v != "." && v != "/" && v != kops.Version {
			klog.Infof("Overriding kops version from KOPS_BASE_URL: %q -> %q", kops.Version, v)
			kops.Version = v
		}
	}

	return copyBaseURL(kopsBaseURL)
}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Upgrade/reinstall the kOps binary from official distribution
2. File a bug if a released version carries an invalid default base URL

When it happens

Trigger: Thrown at pkg/nodemodel/wellknownassets/kopsassets.go:53 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/92eed4edebf1c474. Report an issue: GitHub.