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.
The gateway is also reachable as gateway.docker.internal.
link: https://docs.docker.com/docker-for-mac/networking/
docker在制作镜像时，抛出异常:
debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (This frontend requires a controlling tty.)
debconf: falling back to frontend: Teletype
dpkg-preconfigure: unable to re-open stdin:原因是因为在使用apt-get安装依赖时并非静默安装，需要交互，所以无法正常通过。
解决方法,在docker file中增加一句：
ENV DEBIAN_FRONTEND noninteractivelink: https://blog.csdn.net/a19891024/article/details/78250967