kubernetes/kops · error

listing NLBs: %v

Error message

listing NLBs: %v

What it means

The paginated DescribeLoadBalancers call failed while searching NLBs (describeNetworkLoadBalancers); the ELBV2 API request itself errored (permissions, wrong region, throttling) and the wrapped error carries the AWS detail.

Source

Thrown at upup/pkg/fi/cloudup/awstasks/network_load_balancer.go:148

	if len(found) == 0 {
		return nil, nil
	}

	if len(found) != 1 {
		return nil, fmt.Errorf("Found multiple NLBs with DNSName %q", dnsName)
	}

	return &found[0], nil
}

func describeNetworkLoadBalancers(ctx context.Context, cloud awsup.AWSCloud, request *elbv2.DescribeLoadBalancersInput, filter func(elbv2types.LoadBalancer) bool) ([]elbv2types.LoadBalancer, error) {
	var found []elbv2types.LoadBalancer
	paginator := elbv2.NewDescribeLoadBalancersPaginator(cloud.ELBV2(), request)
	for paginator.HasMorePages() {
		page, err := paginator.NextPage(ctx)
		if err != nil {
			return nil, fmt.Errorf("listing NLBs: %v", err)
		}
		for _, lb := range page.LoadBalancers {
			if filter(lb) {
				found = append(found, lb)
			}
		}
	}

	return found, nil
}

func (e *NetworkLoadBalancer) getDNSName() *string {
	return e.DNSName
}

func (e *NetworkLoadBalancer) getHostedZoneId() *string {
	return e.HostedZoneId
}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Grant elasticloadbalancing:DescribeLoadBalancers to the kops principal if UnauthorizedOperation
2. Retry after backoff if the cause is ThrottlingException
3. Check AWS health/status for the region if the API is failing broadly

Example fix

null

_, err := findNLBs(ctx)
var ae smithy.APIError
if errors.As(err, &ae) && (ae.ErrorCode() == "ThrottlingException" || ae.ErrorCode() == "RequestTimeout") {
    time.Sleep(exponentialBackoff(attempt)); retry()
}

When it happens

Trigger: paginator.NextPage(ctx) returns an error — AWS throttling (ThrottlingException), invalid credentials, authorization failure, or network/API error — while paging through the account's NLBs.

Common situations: Accounts with many load balancers hitting pagination and throttling; IAM missing elasticloadbalancing:DescribeLoadBalancers; temporary AWS regional issues.

Related errors

• error describing instances: %v
• error listing AutoScaling LaunchTemplates: %v
• error listing ELBs: %w
• error listing IAM role policies: %v
• error listing IAM role policies for %v

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/3f01f03ba22566cf. Report an issue: GitHub.