kubernetes/kops · error

failed to extract flavors: %v

Error message

failed to extract flavors: %v

What it means

getFlavor returns this error when flavors.ExtractFlavors fails to decode the flavor listing pages returned by Nova. The API call succeeded, but gophercloud could not extract []flavors.Flavor from the response body.

Source

Thrown at upup/pkg/fi/cloudup/openstack/instance.go:385

		return instances, wait.ErrWaitTimeout
	}
}

func (c *openstackCloud) GetFlavor(name string) (*flavors.Flavor, error) {
	return getFlavor(c, name)
}

func getFlavor(c OpenstackCloud, name string) (*flavors.Flavor, error) {
	opts := flavors.ListOpts{}
	pager := flavors.ListDetail(c.ComputeClient(), opts)
	page, err := pager.AllPages(context.TODO())
	if err != nil {
		return nil, fmt.Errorf("failed to list flavors: %v", err)
	}

	fs, err := flavors.ExtractFlavors(page)
	if err != nil {
		return nil, fmt.Errorf("failed to extract flavors: %v", err)
	}
	for _, f := range fs {
		if f.Name == name {
			return &f, nil
		}
	}

	return nil, fmt.Errorf("could not find flavor with name %v", name)
}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Inspect the raw flavor-list response from the compute endpoint to see the actual body
2. Remove/fix any proxy between the client and Nova that may corrupt the response
3. Update gophercloud (and kops) to a version compatible with your OpenStack release

f, err := GetFlavor(cloud, name)
if err != nil && strings.Contains(err.Error(), "failed to extract flavors") {
    log.Printf("flavor response unparseable; retrying once")
    f, err = GetFlavor(cloud, name)
}

When it happens

Trigger: flavors.ExtractFlavors errors on malformed or unexpected JSON — e.g. a proxy returning non-JSON bodies, a custom OpenStack flavor response schema, or SDK version mismatch between kops' gophercloud and the cloud release.

Common situations: Non-standard OpenStack distributions with altered flavor payloads; intermediary proxies injecting HTML error content; stale gophercloud client incompatible with the cloud's API microversion.

Related errors

• error extracting servers from pages: %v
• failed to extract storage availability zones: %v
• error building cinder client: %w
• error building neutron client: %w
• error building nova client: %w

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/1aae81595ff08fd0. Report an issue: GitHub.