使用此选项可删除所有内容：

docker system prune -a --volumes

删除所有未使用的容器、卷、网络和映像

WARNING! This will remove:
    - all stopped containers
    - all networks not used by at least one container
    - all volumes not used by at least one container
    - all images without at least one container associated to them
    - all build cache

https://docs.docker.com/engine/reference/commandline/system_prune/#extended-说明

要删除所有Docker本地Docker镜像，请执行以下两个步骤：

步骤1：docker图像（列出所有具有id的docker图像）

     example :
     REPOSITORY    TAG    IMAGE ID            CREATED             SIZE
     pradip564/my  latest 31e522c6cfe4        3 months ago        915MB

步骤2：docker image rm 31e522c6cfe4（图像ID）

      OUTPUT : image deleted

xargs的另一种方式（仅限Unix）

docker image ls -q | xargs -I {} docker image rm -f {}

删除所有停止的容器和所有未使用的图像。

docker系统prune-a

docker image prune -a

删除所有未使用的图像，而不仅仅是悬挂的图像。将-f选项添加到武力

本地docker版本：17.09.0-ce，Gitcommit:afdb6d4，OS/Arch:darwin/amd64

$ docker image prune -h
Flag shorthand -h has been deprecated, please use --help

Usage:  docker image prune [OPTIONS]

Remove unused images

Options:
  -a, --all             Remove all unused images, not just dangling ones
      --filter filter   Provide filter values (e.g. 'until=<timestamp>')
  -f, --force           Do not prompt for confirmation
      --help            Print usage

使用此选项可删除所有内容：

docker system prune -a --volumes

删除所有未使用的容器、卷、网络和映像

WARNING! This will remove:
    - all stopped containers
    - all networks not used by at least one container
    - all volumes not used by at least one container
    - all images without at least one container associated to them
    - all build cache

https://docs.docker.com/engine/reference/commandline/system_prune/#extended-说明