code: def configure_nodes(self):
          
          # Since load balancing runs after server provisioning,
          # the servers should already be created regardless of
          # whether this was a preexisting load balancer or not.
          # We also have the existing nodes, because add_to_inventory
          # has been called already
          required_nodes = self._get_required_nodes()
  
          log.debug(
                  "Matching existing lb nodes to required %s (port %s)"
                  % (", ".join(required_nodes), self.backend_port)
                  )
  
          self.consul.match_lb_nodes(
              self.lb_attrs[A.loadbalancer.ID],
              self.lb_attrs[A.loadbalancer.NODES_KEY],
              required_nodes,
              self.backend_port)
  
          self.lb_attrs = self.consul.lb_details(
                  self.lb_attrs[A.loadbalancer.ID]
                  )
docs: Ensure that the LB's nodes matches the stack