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Use the Notary client
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VFS存储驱动程序不是联合文件系统；相反，每个图层都是磁盘上的目录，并且没有写时复制支持。要创建一个新图层，先前的图层会进行“深层复制”。与其他存储驱动程序相比，这会导致磁盘性能下降和磁盘使用空间更多。但是，它强大，稳定，适用于各种环境。它也可以用作在测试环境中验证其他存储后端的机制。
使用vfs存储驱动程序配置Docker
停止Docker。$ sudo systemctl stop docker
2. 编辑/etc/docker/daemon.json。如果它还不存在，请创建它。假设文件为空，请添加以下内容。
{ "storage-driver": "vfs" }
如果daemon.json文件包含格式错误的JSON，Docker将无法启动。
3. 启动Docker。$ sudo systemctl start docker
4. 验证守护进程正在使用vfs存储驱动程序。使用该docker info命令并查找Storage Driver和Backing filesystem。
$ docker info存储驱动程序：vfs <output truncated>
Docker现在使用vfs存储驱动程序。Docker自动创建了/var/lib/docker/vfs/目录，其中包含运行容器使用的所有图层。
如何vfs存储驱动程序作品
VFS不是联合文件系统。相反，每个图像层和可写容器层都在Docker主机上表示为子目录/var/lib/docker/。联合安装提供了所有图层的统一视图。目录名称不直接对应于图层本身的ID。
VFS不支持写入时拷贝（COW），因此每次创建一个新图层时，它都是其父图层的深层副本。这些图层都位于下方/var/lib/docker/dir/。
示例：映像和容器在磁盘上的结构
以下docker pull命令显示了一个Docker主机下载一个包含五层的Docker镜像。
$ docker pull ubuntu Using default tag: latest latest: Pulling from library/ubuntu e0a742c2abfd: Pull complete 486cb8339a27: Pull complete dc6f0d824617: Pull complete 4f7a5649a30e: Pull complete 672363445ad2: Pull complete Digest: sha256:84c334414e2bfdcae99509a6add166bbb4fa4041dc3fa6af08046a66fed3005f Status: Downloaded newer image for ubuntu:latest
pull之后，这些层中的每一层都被表示为一个子目录/var/lib/docker/vfs/dir/。目录名称与docker pull命令中显示的图像层ID不相关。要查看每个图层在磁盘上占用的大小，可以使用du -sh命令，该命令将大小视为可读的值。
$ ls -l /var/lib/docker/vfs/dir/total 0drwxr-xr-x. 2 root root 19 Aug 2 18:19 3262dfbe53dac3e1ab7dcc8ad5d8c4d586a11d2ac3c4234892e34bff7f6b821e drwxr-xr-x. 21 root root 224 Aug 2 18:23 6af21814449345f55d88c403e66564faad965d6afa84b294ae6e740c9ded2561 drwxr-xr-x. 21 root root 224 Aug 2 18:23 6d3be4585ba32f9f5cbff0110e8d07aea5f5b9fbb1439677c27e7dfee263171c drwxr-xr-x. 21 root root 224 Aug 2 18:23 9ecd2d88ca177413ab89f987e1507325285a7418fc76d0dcb4bc021447ba2bab drwxr-xr-x. 21 root root 224 Aug 2 18:23 a292ac6341a65bf3a5da7b7c251e19de1294bd2ec32828de621d41c7ad31f895 drwxr-xr-x. 21 root root 224 Aug 2 18:23 e92be7a4a4e3ccbb7dd87695bca1a0ea373d4f673f455491b1342b33ed91446b
$ du -sh /var/lib/docker/vfs/dir/* 4.0K /var/lib/docker/vfs/dir/3262dfbe53dac3e1ab7dcc8ad5d8c4d586a11d2ac3c4234892e34bff7f6b821e 125M /var/lib/docker/vfs/dir/6af21814449345f55d88c403e66564faad965d6afa84b294ae6e740c9ded2561 104M /var/lib/docker/vfs/dir/6d3be4585ba32f9f5cbff0110e8d07aea5f5b9fbb1439677c27e7dfee263171c 125M /var/lib/docker/vfs/dir/9ecd2d88ca177413ab89f987e1507325285a7418fc76d0dcb4bc021447ba2bab 104M /var/lib/docker/vfs/dir/a292ac6341a65bf3a5da7b7c251e19de1294bd2ec32828de621d41c7ad31f895 104M /var/lib/docker/vfs/dir/e92be7a4a4e3ccbb7dd87695bca1a0ea373d4f673f455491b1342b33ed91446b
以上输出结果显示三层各取104M，两层取125M。这些目录彼此之间只有很小的差异，但在磁盘上占用的空间几乎相同。这是使用vfs存储驱动程序的一个缺点。
相关信息
了解图像，容器和存储驱动程序
选择存储驱动程序
AUFS存储驱动程序在实践中
OverlayFS存储驱动程序在实践中的应用
Btrfs存储驱动程序在实践中的应用
设备Mapper存储驱动程序在实践中的应用