def reserve_free_tcp_port(self):
        """
        
        """
        self.reserved_tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.reserved_tcp_socket.bind(('127.0.0.1', 0))
        self.sql_proxy_tcp_port = self.reserved_tcp_socket.getsockname()[1]