-v 出现 unknown: Are you trying to mount a directory onto a file (or vice-versa)

解决方案:

假设 docker run -v local_file_path:docker_file_path docker_image

1. local_file_path 必须存在, 并且类型为文件
2. docker_file_path 必须存在, 绝对路径, 并且类型为文件

原因:

从 docker 文档 Differences between -v and --mount behavior

If you use -v or --volume to bind-mount a file or directory that does not yet exist on the Docker host, -v creates the endpoint for you. 
It is always created as a directory.

如果文件不存在, docker总会创建一个目录

排查方法

添加 -it --entrypoint bash 进入容器查看文件是否存在

docker run -v local_file_path:docker_file_path -it --entrypoint bash docker_image

参考文档

• How to mount a single file in a volume
  
  

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