使用docker创建mysql容器出错：
Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: error mounting "/data/mysql/my.cnf" to rootfs at "/etc/my.cnf": mount /data/mysql/my.cnf:/etc/my.cnf (via /proc/self/fd/6), flags: 0x5000: not a directory: unknown: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type

解决方法：

原因是因为挂载数据文件时/data/mysql/my.cnf是以一个目录生成，而不是文件！！！（由于容器内的/etc/my.cnf是文件，而挂载时/data/mysql/my.cnf是目录）

所以：删除my.cnf 目录，然后新建一个my.cnf 文件就可以了。