我的Dockerfile里暴露的缺失是3000端口，運(yùn)行下面指令：
docker run -P -d --name myexpress alpha/express
查看結(jié)果如下：
可我嘗試訪問：localhost:32768,沒有結(jié)果。
但是我登進(jìn)虛擬機(jī)，curl端口3000是有結(jié)果的。
所以目前我的情況是：容器內(nèi)的應(yīng)用（Express）跑起來了，可外部訪問不到，我覺得是端口映射出問題了。
各路大神，給我出出主意吧。
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學(xué)習(xí)是最好的投資！
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
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