在 Docker 中 使用ubuntu 安装 Symfony 出现问题:

mount: Could not find any loop device. Maybe this kernel does not know about the loop device?  
setfacl xxx operation not supported

To mount an ISO inside a container, you need two things:

access to loop devices,  
permission to mount filesystems.  
By default, Docker locks down both things; that’s why you get that error message. The easiest solution is to start the container in privileged mode (docker run -privileged …).  

问题答案链接:http://stackoverflow.com/questions/22028795/is-it-possible-to-mount-an-iso-inside-a-docker-container?answertab=votes#tab-top