unable prepare context:unable to evaluate symlinks in Dockerfile path:lstat /mydocker/Dockerfile:

unable prepare context:unable to evaluate symlinks in Dockerfile path:lstat /mydocker/Dockerfile:
Docker build 的路径问题,把 docker build -f /mydocker/Dockerfile -t zzyy/centos .
改为docker build -f /Dockerfile -t zzyy/centos .
.
unable prepare context:unable to evaluate symlinks in Dockerfile path:lstat /mydocker/Dockerfile: