我的Dockerfile里暴露的缺失是3000端口，运行下面指令：
docker run -P -d --name myexpress alpha/express
查看结果如下：
可我尝试访问：localhost:32768,没有结果。但是我登进虚拟机，curl端口3000是有结果的。
所以目前我的情况是：容器内的应用（Express）跑起来了，可外部访问不到，我觉得是端口映射出问题了。各路大神，给我出出主意吧。
学习是最好的投资！
If you want to look at it this way on a mac, there is a container management software called kitematic,
It seems there is a problem with the service binding address. Binding 127.0.0.1 may not receive requests from external IPs.
127.0.0.1 is a loopback address, which can only be accessed locally and cannot be accessed externally. So your express needs to monitor the address 0.0.0.0
-p IP address: host port: IP address: container port/protocol
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If you want to look at it this way on a mac, there is a container management software called kitematic,
It seems there is a problem with the service binding address. Binding 127.0.0.1 may not receive requests from external IPs.
127.0.0.1 is a loopback address, which can only be accessed locally and cannot be accessed externally. So your express needs to monitor the address 0.0.0.0
-p IP address: host port: IP address: container port/protocol