code: func (proxier *Proxier) ensurePortals() {
  	// NB: This does not remove rules that should not be present.
  	for name, info := range proxier.serviceMap {
  		err := proxier.openPortal(name, info)
  		if err != nil {
  			klog.Errorf("Failed to ensure portal for %q: %v", name, err)
  		}
  	}
  }
docs: // Ensure that portals exist for all services.