kubernetes/kops · error

error replacing instanceGroup: %v

Error message

error replacing instanceGroup: %v

What it means

When the InstanceGroup exists (ig != nil), `kops replace` calls Update to persist the new version. This error wraps any failure returned by that Update call — the replacement of the existing InstanceGroup resource failed against the state store.

Source

Thrown at cmd/kops/replace.go:194

					if errors.IsNotFound(err) {
						if !c.Force {
							return fmt.Errorf("instanceGroup: %v does not exist (try adding --force flag)", igName)
						}
					} else {
						return fmt.Errorf("unable to check for instanceGroup: %v", err)
					}
				}
				switch ig {
				case nil:
					klog.Infof("instanceGroup: %v was not found, creating resource now", igName)
					_, err = clientset.InstanceGroupsFor(cluster).Create(ctx, v, metav1.CreateOptions{})
					if err != nil {
						return fmt.Errorf("error creating instanceGroup: %v", err)
					}
				default:
					_, err = clientset.InstanceGroupsFor(cluster).Update(ctx, v, metav1.UpdateOptions{})
					if err != nil {
						return fmt.Errorf("error replacing instanceGroup: %v", err)
					}
				}
			case *kopsapi.SSHCredential:
				clusterName := v.ObjectMeta.Labels[kopsapi.LabelClusterName]
				if clusterName == "" {
					return fmt.Errorf("must specify %q label with cluster name to replace SSHCredential", kopsapi.LabelClusterName)
				}
				if v.Spec.PublicKey == "" {
					return fmt.Errorf("spec.PublicKey is required")
				}

				cluster, err := clientset.GetCluster(ctx, clusterName)
				if err != nil {
					return err
				}

				sshCredentialStore, err := clientset.SSHCredentialStore(cluster)
				if err != nil {

View on GitHub (pinned to 4c8573c808)

Solutions

1. Read the wrapped error; if it's a conflict, re-fetch the current IG (`kops get ig <name> -o yaml`) and rebase your change before replacing.
2. Fix any validation issues flagged in the wrapped error (e.g. subnet or instance type references).
3. Retry if the backend error was transient.
4. Ensure only one pipeline mutates the cluster at a time (locking in CI).

// Compare your manifest against the live IG before update
live, _ := json.Marshal(liveIG)
wanted, _ := json.Marshal(newIG)
if !bytes.Equal(normalize(live), normalize(wanted)) { /* rebase changes */ }

if strings.HasPrefix(err.Error(), "error replacing instanceGroup:") {
    // fetch current IG, rebase manifest changes, retry once
    ig, _ := clientset.InstanceGroupsFor(cluster).Get(ctx, igName, metav1.GetOptions{})
    mergeChanges(ig, newIG)
    return clientset.InstanceGroupsFor(cluster).Update(ctx, ig, metav1.UpdateOptions{})
}

When it happens

Trigger: Update fails: optimistic-concurrency/conflict (IG modified since last read), spec rejected by validation, or state-store write failure (network/permissions).

Common situations: Another operator or CI job updated the IG concurrently; manifest removes required fields or references deleted subnets/AMIs; temporary S3/etcd unavailability.

Related errors

• did not find owner for node %q
• invalid InstanceGroup name: %v
• error building InstanceGroup from CAPI Machine: %w
• must specify %q label with cluster name to create instanceGr
• cluster %q not found

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/603af533c2b6eeef. Report an issue: GitHub.