kubernetes/kops · error

error parsing RequiredVersion %q from channel

Error message

error parsing RequiredVersion %q from channel

What it means

IsUpgradeRequired validates the channel's spec.kubernetesVersion.requiredVersion with util.ParseKubernetesVersion. This error means the RequiredVersion string in the channel is not a parseable Kubernetes version, so kOps cannot decide whether the cluster must upgrade.

Source

Thrown at pkg/apis/kops/channel.go:215

	}
	if recommendedVersion.GT(version) {
		klog.V(2).Infof("RecommendedVersion=%q, Have=%q.  Recommending upgrade", recommendedVersion, version)
		return &recommendedVersion, nil
	}
	klog.V(4).Infof("RecommendedVersion=%q, Have=%q.  No upgrade needed.", recommendedVersion, version)
	return nil, nil
}

// IsUpgradeRequired returns true if the current version is not acceptable
func (v *KubernetesVersionSpec) IsUpgradeRequired(version semver.Version) (bool, error) {
	if v.RequiredVersion == "" {
		klog.V(2).Infof("VersionRecommendationSpec does not specify RequiredVersion")
		return false, nil
	}

	requiredVersion, err := util.ParseKubernetesVersion(v.RequiredVersion)
	if err != nil {
		return false, fmt.Errorf("error parsing RequiredVersion %q from channel", v.RequiredVersion)
	}
	if requiredVersion.GT(version) {
		klog.V(2).Infof("RequiredVersion=%q, Have=%q.  Requiring upgrade", requiredVersion, version)
		return true, nil
	}
	klog.V(4).Infof("RequiredVersion=%q, Have=%q.  No upgrade needed.", requiredVersion, version)
	return false, nil
}

// IsUpgradeRequired returns true if the current version is not acceptable
func (v *KopsVersionSpec) IsUpgradeRequired(version semver.Version) (bool, error) {
	if v.RequiredVersion == "" {
		klog.V(2).Infof("VersionRecommendationSpec does not specify RequiredVersion")
		return false, nil
	}

	requiredVersion, err := semver.ParseTolerant(v.RequiredVersion)
	if err != nil {

View on GitHub (pinned to 4c8573c808)

Solutions

1. Set requiredVersion to a plain three-component version, e.g. 1.24.7.
2. Check the strictness of util.ParseKubernetesVersion in your kOps version; strip 'v' and any pre-release/build suffixes.
3. If a minimum version range is needed, express it within what the parser supports or bump requiredVersion to a concrete patch release.

Example fix

// before
requiredVersion: v1.24.0-beta.1
// after
requiredVersion: 1.24.0

rq := channel.Spec.KubernetesVersion.RequiredVersion
if _, err := util.ParseKubernetesVersion(rq); err != nil {
    return fmt.Errorf("channel requiredVersion %q invalid", rq)
}

func isValidRequiredVersion(v string) bool { _, err := util.ParseKubernetesVersion(v); return err == nil }

required, err := channel.IsUpgradeRequired(version)
if err != nil && strings.Contains(err.Error(), "RequiredVersion") {
    // fail closed: treat unparseable required version as channel bug
    return fmt.Errorf("channel requiredVersion invalid: %w", err)
}

When it happens

Trigger: IsUpgradeRequired on a channel whose RequiredVersion fails util.ParseKubernetesVersion — leading 'v', pre-release/build metadata, or fewer than three numeric components.

Common situations: Custom channel with requiredVersion: v1.24 or 1.24.0-rc1 where the strict parser rejects the suffix; channel edited by tooling that prefixed 'v'; copy of recommendedVersion into requiredVersion with extra text.

Related errors

• error parsing RecommendedVersion %q from channel
• error parsing version %q for package %q
• error loading channel %q: %v
• invalid base channel location: %q
• error reading channel %q: %v

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/da58e26f9efea7a7. Report an issue: GitHub.