kubernetes/kops · error

error writing InstanceGroup %q: %v

Error message

error writing InstanceGroup %q: %v

What it means

Wraps a failure of the InstanceGroups Update API call during `kops upgrade --yes`: the upgraded instance group configuration could not be written back to the state store. Earlier cluster-spec updates may already have been applied.

Source

Thrown at cmd/kops/upgrade_cluster.go:308

		}
	}

	if !options.Yes {
		fmt.Printf("\nMust specify --yes to perform upgrade\n")
		return nil
	}
	for _, action := range actions {
		action.apply()
	}

	if err := commands.UpdateCluster(ctx, clientset, cluster, instanceGroups); err != nil {
		return err
	}

	for _, g := range instanceGroups {
		_, err := clientset.InstanceGroupsFor(cluster).Update(ctx, g, metav1.UpdateOptions{})
		if err != nil {
			return fmt.Errorf("error writing InstanceGroup %q: %v", g.ObjectMeta.Name, err)
		}
	}

	fmt.Printf("\nUpdates applied to configuration.\n")

	// TODO: automate this step
	fmt.Printf("You can now apply these changes, using `kops update cluster %s`\n", cluster.ObjectMeta.Name)

	return nil
}

func completeChannel(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	// TODO implement completion against VFS
	return []string{"alpha", "stable"}, cobra.ShellCompDirectiveNoFileComp
}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Check state store (S3/GCS) write permissions and connectivity
2. Re-run kops upgrade cluster --yes after fixing access
3. Inspect kops get instancegroups for partial state

When it happens

Trigger: Thrown at cmd/kops/upgrade_cluster.go:308 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/cc61750ba5c8827f. Report an issue: GitHub.