kubernetes/kops · error

error listing instances in InstanceGroupManager: %v

Error message

error listing instances in InstanceGroupManager: %v

What it means

Fires when listManagedInstances fails to enumerate the VM instances belonging to a discovered InstanceGroupManager during GCE cluster resource discovery — an API or network failure listing managed instances.

Source

Thrown at pkg/resources/gce/gce.go:241

				continue
			}

			resourceTracker := &resources.Resource{
				Name:    mig.Name,
				ID:      zoneName + "/" + mig.Name,
				Type:    typeInstanceGroupManager,
				Deleter: func(cloud fi.Cloud, r *resources.Resource) error { return gce.DeleteInstanceGroupManager(c, mig) },
				Obj:     mig,
			}

			resourceTracker.Blocks = append(resourceTracker.Blocks, typeInstanceTemplate+":"+instanceTemplate.Name)

			klog.V(4).Infof("Found resource: %s", mig.SelfLink)
			resourceTrackers = append(resourceTrackers, resourceTracker)

			instanceTrackers, err := d.listManagedInstances(mig)
			if err != nil {
				return nil, fmt.Errorf("error listing instances in InstanceGroupManager: %v", err)
			}
			resourceTrackers = append(resourceTrackers, instanceTrackers...)
		}
	}

	return resourceTrackers, nil
}

func (d *clusterDiscoveryGCE) listManagedInstances(igm *compute.InstanceGroupManager) ([]*resources.Resource, error) {
	c := d.gceCloud

	var resourceTrackers []*resources.Resource

	zoneName := gce.LastComponent(igm.Zone)

	instances, err := gce.ListManagedInstances(c, igm)
	if err != nil {
		return nil, err

View on GitHub (pinned to 4c8573c808)

Solutions

1. Check compute.instanceGroupManagers.listManagedInstances permission
2. Retry; the MIG may be mid-resize and transient errors can occur
3. Inspect the MIG via gcloud to verify its instances are accessible

When it happens

Trigger: Thrown at pkg/resources/gce/gce.go:241 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/9cddbaf441dfdfb1. Report an issue: GitHub.