由于权限被拒绝错误，无法从 Docker 图像创建 Dockerfile

Question

我正在尝试从 Docker 图像中提取 Dockerfile。看看一个流行的答案，我执行了以下命令：

docker run -v /var/run/docker.sock:/var/run/docker.sock --rm alpine/dfimage -sV=1.36 quay.io/opendatahub/spark-cluster-image:spark24

得到以下错误：

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.36/images/create?fromImage=quay.io%2Fopendatahub%2Fspark-cluster-image&tag=spark24": dial unix /var/run/docker.sock: connect: permission denied

如何获得此图像对应的 Dockerfile？

Answer 1

使用sudo命令运行。

sudo docker run -v /var/run/docker.sock:/var/run/docker.sock --rm alpine/dfimage -sV=1.36 quay.io/opendatahub/spark-cluster-image:spark24

或添加权限

If you would like to use Docker as a non-root user, you should now consider
adding your user to the "docker" group with something like:

  sudo usermod -aG docker your-user