kubernetes/kops · error

unable to parse env var KOPS_BASE_URL %q as a url: %v

Error message

unable to parse env var KOPS_BASE_URL %q as a url: %v

What it means

The user-set KOPS_BASE_URL environment variable is not a parseable URL. Unlike the default-URL failure, this one is directly caused by operator configuration and is checked before any downloads happen.

Source

Thrown at pkg/nodemodel/wellknownassets/kopsassets.go:58

	// 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)
}

// copyBaseURL makes a copy of the base url or the path.Joins can append stuff to this URL
func copyBaseURL(base *url.URL) (*url.URL, error) {
	u, err := url.Parse(base.String())
	if err != nil {

View on GitHub (pinned to 4c8573c808)

Solutions

1. Fix KOPS_BASE_URL to a valid absolute URL (e.g. https://artifacts.example/kops/<version>/)
2. Unset KOPS_BASE_URL to fall back to the default distribution location

When it happens

Trigger: Thrown at pkg/nodemodel/wellknownassets/kopsassets.go:58 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/197d879dd5b541c7. Report an issue: GitHub.