[镜像的分层](%E9%95%9C%E5%83%8F%E7%9A%84%E5%88%86%E5%B1%82.md) [add copy](addcopy.md) [构建实例](%E6%9E%84%E5%BB%BA%E5%AE%9E%E4%BE%8B.md)