内容简介：自Linux3.4之后，就可以使用overlay了。来，耍耍。解释两点：实现，就去看下边的 overlay.txt，用法，就看ArchWiki和Docker那个文档，就不赘述了。另外：
自 Linux 3.4之后，就可以使用overlay了。来，耍耍。
[email protected]:~/playoverlay$ mkdir lower{1,2,3} upper work merged # 创建文件夹 [email protected]:~/playoverlay$ touch lower1/l1.txt lower2/l2.txt lower3/l3.txt # 创建文件 [email protected]:~/playoverlay$ tree # 这是目前的结构 . ├── lower1 │ └── l1.txt ├── lower2 │ └── l2.txt ├── lower3 │ └── l3.txt ├── merged ├── upper └── work 6 directories, 3 files [email protected]:~/playoverlay$ sudo mount -t overlay overlay -o lowerdir=./lower1:./lower2:./lower3,upperdir=./upper,workdir=./work ./merged/ # 挂载 [email protected]:~/playoverlay$ tree # 这是目前的结构 . ├── lower1 │ └── l1.txt ├── lower2 │ └── l2.txt ├── lower3 │ └── l3.txt ├── merged │ ├── l1.txt │ ├── l2.txt │ └── l3.txt ├── upper └── work └── work [error opening dir] 7 directories, 6 files [email protected]:~/playoverlay$ touch merged/hahahahhha # 创建一个文件 [email protected]:~/playoverlay$ rm merged/l1.txt # 删除一个文件 [email protected]:~/playoverlay$ tree . ├── lower1 │ └── l1.txt ├── lower2 │ └── l2.txt ├── lower3 │ └── l3.txt ├── merged │ ├── hahahahhha │ ├── l2.txt │ └── l3.txt ├── upper │ ├── hahahahhha │ └── l1.txt └── work └── work [error opening dir] 7 directories, 8 files [email protected]:~/playoverlay$
解释两点：
-
sudo mount -t overlay overlay -o lowerdir=./lower1:./lower2:./lower3,upperdir=./upper,workdir=./work ./merged/:./merged/
- 如果我们直接删除lower2里的文件会怎样呢？
[email protected]:~/playoverlay$ tree . ├── lower1 │ └── l1.txt ├── lower2 │ └── l2.txt ├── lower3 │ └── l3.txt ├── merged │ ├── hahahahhha │ ├── l2.txt │ └── l3.txt ├── upper │ ├── hahahahhha │ └── l1.txt └── work └── work [error opening dir] 7 directories, 8 files [email protected]:~/playoverlay$ rm lower2/l2.txt [email protected]:~/playoverlay$ tree . ├── lower1 │ └── l1.txt ├── lower2 ├── lower3 │ └── l3.txt ├── merged │ ├── hahahahhha │ └── l3.txt ├── upper │ ├── hahahahhha │ └── l1.txt └── work └── work [error opening dir] 7 directories, 6 files [email protected]:~/playoverlay$
当然是上边就看不到了。
实现，就去看下边的 overlay.txt，用法，就看ArchWiki和 Docker 那个文档，就不赘述了。另外：
- 可以使用mount打印出当前挂载的overlayfs
- 用Docker起容器之后，可以用mount打印出挂载的overlayfs，然后探索探索Docker是怎么使用overlayfs的
以上所述就是小编给大家介绍的《耍耍OverlayFS》，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持！
猜你喜欢:
本站部分资源来源于网络，本站转载出于传递更多信息之目的，版权归原作者或者来源机构所有，如转载稿涉及版权问题，请联系我们。
Twenty Lectures on Algorithmic Game Theory
Tim Roughgarden / Cambridge University Press / 2016-8-31 / USD 34.99
Computer science and economics have engaged in a lively interaction over the past fifteen years, resulting in the new field of algorithmic game theory. Many problems that are central to modern compute......一起来看看 《Twenty Lectures on Algorithmic Game Theory》 这本书的介绍吧!
