kubernetes/kops · error

error getting instance group for ASG %q

Error message

error getting instance group for ASG %q

What it means

matchInstanceGroup could not unambiguously map an AWS AutoScalingGroup name to a kops InstanceGroup (it returns an error when multiple instance groups match the ASG name). The ASG name is the input at fault; the underlying matcher error is discarded by this wrapping.

Source

Thrown at upup/pkg/fi/cloudup/awsup/aws_cloud.go:806

	return karpenterGroup, nil
}

func getCloudGroups(ctx context.Context, c AWSCloud, cluster *kops.Cluster, instancegroups []*kops.InstanceGroup, warnUnmatched bool, nodes []v1.Node) (map[string]*cloudinstances.CloudInstanceGroup, error) {
	nodeMap := cloudinstances.GetNodeMap(nodes, cluster)

	groups := make(map[string]*cloudinstances.CloudInstanceGroup)
	asgs, err := FindAutoscalingGroups(c, c.Tags())
	if err != nil {
		return nil, fmt.Errorf("unable to find autoscale groups: %v", err)
	}

	for _, asg := range asgs {
		name := aws.ToString(asg.AutoScalingGroupName)

		instancegroup, err := matchInstanceGroup(name, cluster.ObjectMeta.Name, instancegroups)
		if err != nil {
			return nil, fmt.Errorf("error getting instance group for ASG %q", name)
		}
		if instancegroup == nil {
			if warnUnmatched {
				klog.Warningf("Found ASG with no corresponding instance group %q", name)
			}
			continue
		}

		groups[instancegroup.ObjectMeta.Name], err = awsBuildCloudInstanceGroup(ctx, c, cluster, instancegroup, asg, nodeMap)
		if err != nil {
			return nil, fmt.Errorf("error getting cloud instance group %q: %v", instancegroup.ObjectMeta.Name, err)
		}
	}

	return groups, nil
}

// FindAutoscalingGroups finds autoscaling groups matching the specified tags

View on GitHub (pinned to 4c8573c808)

Solutions

1. List the cluster's instance groups and rename or delete the duplicate ones that match the reported ASG name
2. Check for leftover ASGs from a previous cluster with the same name and delete stale ASGs via the AWS console or CLI
3. Run 'kops get ig' to inspect instance group names for collisions

When it happens

Trigger: Thrown at upup/pkg/fi/cloudup/awsup/aws_cloud.go:806 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/38d54546f927093e. Report an issue: GitHub.