How can I manage many games by using a dedicated server?

Now I have a dedicated server for my games. The game needs a match system, I use the command “open xxx.xxx.xx.xxx” to connect to my server. Now I meet a problem: One server can only host one game. When the game start , the server also need to open the gamemap(servertravel) . Thus more player join it only join the game map,but I don’t want them to join the game started…
So my question is: How to manage more than one game in one server?

I think I have those problem too:
When the game started , I need to stop other players join the started game.

我现在有一个专用的服务器了,我的游戏需要一个匹配机制,我用“”open ip“”这个指令来连接我的服务器,现在我遇到了一个问题:一个服务器只可以开启一个游戏。在游戏开始后,服务器也加入了那个游戏的地图里,所以别的玩家想再加入就只会加入服务器所在的游戏地图,然而这是我不想看到的。。。。
所以我的问题是:怎么让服务器一次管理(开启)多个游戏?可以理解为开很多游戏房间,而不是只有一个房间。
我想我还有一个问题:怎么让游戏开始后禁止别的玩家加入这个游戏?(Open IP)