ahmetb/kubectx · error

failed to save modified kubeconfig: %w

Error message

failed to save modified kubeconfig: %w

What it means

kc.Save() failed to persist the modified kubeconfig back to disk after the rename was applied in memory. Fires on filesystem errors: permission denied on the kubeconfig file(s), read-only mounts, or a Reset/encode failure in the save loop over multiple KUBECONFIG files.

Source

Thrown at cmd/kubectx/rename.go:91

		return fmt.Errorf("failed to check context: %w", err)
	}
	if newExists {
		printer.Warning(stderr, "context \"%s\" exists, overwriting it.", op.New)
		if err := kc.DeleteContextEntry(op.New); err != nil {
			return fmt.Errorf("failed to delete new context to overwrite it: %w", err)
		}
	}

	if err := kc.ModifyContextName(op.Old, op.New); err != nil {
		return fmt.Errorf("failed to change context name: %w", err)
	}
	if op.Old == cur {
		if err := kc.ModifyCurrentContext(op.New); err != nil {
			return fmt.Errorf("failed to set current-context to new name: %w", err)
		}
	}
	if err := kc.Save(); err != nil {
		return fmt.Errorf("failed to save modified kubeconfig: %w", err)
	}
	_ = printer.Success(stderr, "Context %s renamed to %s.",
		printer.SuccessColor.Sprint(op.Old),
		printer.SuccessColor.Sprint(op.New))
	return nil
}

View on GitHub (pinned to 12ad6fb22e)

Solutions

1. Check write permissions on every file in KUBECONFIG (chmod/ownership of ~/.kube/config)
2. Ensure the directory is not read-only (e.g. macOS System Integrity protection, container mounts)
3. Verify disk space is available

When it happens

Trigger: Thrown at cmd/kubectx/rename.go:91 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of ahmetb/kubectx@12ad6fb22e (2026-09-02). Data as JSON: /api/errors/a089489e0b171843. Report an issue: GitHub.