Mac中Docker访问宿主机服务

Mac的docker并没有docker0这个桥接的网卡，所以无法通过容器的网关IP访问宿主机的服务，这个好坑。。。 查询了官方文档给的解释如下：

There is no docker0 bridge on macOS Because of the way networking is implemented in Docker Desktop for Mac, you cannot see a docker0 interface on the host. This interface is actually within the virtual machine.

容器与宿主机的网络连接是通过Docker Desktop实现的，要访问只能通过域名host.docker.internal访问，官方说明如下：

I WANT TO CONNECT FROM A CONTAINER TO A SERVICE ON THE HOST

The host has a changing IP address (or none if you have no network access). From 18.03 onwards our recommendation is to connect to the special DNS name host.docker.internal, which resolves to the internal IP address used by the host. This is for development purpose and will not work in a production environment outside of Docker Desktop for Mac.