# external\_links

链接到docker-compose.yaml之外启动的容器上或者Compose外部的容器，特别是那些提供共享或者通用服务的容器。当指定容器名和链接的别名时（CONTAINER:ALIAS)，external\_link的语义类似于老的选项links。

```
 external_links:
   - redis_1
   - project_db_1:mysql
   - project_db_1:postgresql
```

Note:

外部创建的容器与它正在链接的服务必须至少连接到一个相同的网络中。Links选项是老版本的选项，现在推荐使用networks。

当以swarm模式部署一个stack时，external\_links会被忽视。


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