前言
一提到在 linux 环境下删除文件，那绝对离不开 sudo rm -rf /* 这个梗，每次看到这个命令，我都想到一幅恶搞的图片：
这个『清理垃圾』的说明真是解释的“恰到好处”，据说有小白在论坛问问题，被人开玩笑的回复了 sudo rm -rf /* 这个命令，结果问题就解决了，人也拜拜了~
从删库到跑路，一天一个入狱小技巧，所以我们一定要谨慎使用 rm -rf 命令，这相当于我们在 Windows 上使用 Shift+Delete 组合，文件不会放到回收站中，而是直接永久删除了，在 Linux 中执行 rm 命令就相当于永久删除。
虽说 sudo rm -rf /* 危险无比，但是我们很少会直接这样写，但是 rm 命令还是经常用的，这不就在前几天，辛辛苦苦写的Shell脚本就被我直接 rm -rf 删掉了，幸亏我之前将内容打印到了控制台，否则整个脚本就白写了。
rm之后还有救吗
尽管 rm 命令表示永久删除，但是不代表文件就一定找不回来，只是找回的几率有大有小。其实删除命令只是在文件节点中作删除标记，并不真正清除文件内容，如果删除后马上进行恢复，那么成功的概率还是很大的，但是如果其他用户一直在用这台机器，或者有一些写盘操作的进程一直在执行，那么这部分数据可能很快就会被覆盖。这时基本上就无法恢复该文件了。
使用foremost找回文件
foremost 是一个基于文件头和尾部信息以及文件的内建数据结构恢复文件的命令行工具，接下来是安装和恢复的步骤：
安装 foremost
CentOS系统直接运行 sudo yum install https://forensics.cert.org/centos/cert/7/x86_64//foremost-1.5.7-13.1.el7.x86_64.rpm -y 命令就可以完成
如果是Ubuntu系统请尝试命令：sudo apt install foremost
[root@VM-0-3-centos ~]# sudo yum install https://forensics.cert.org/centos/cert/7/x86_64//foremost-1.5.7-13.1.el7.x86_64.rpm -y Loaded plugins: fastestmirror, langpacks Repository epel is listed more than once in the configuration foremost-1.5.7-13.1.el7.x86_64.rpm | 46 kB 00:00:01 Examining /var/tmp/yum-root-XJIfxM/foremost-1.5.7-13.1.el7.x86_64.rpm: foremost-1.5.7-13.1.el7.x86_64 Marking /var/tmp/yum-root-XJIfxM/foremost-1.5.7-13.1.el7.x86_64.rpm to be installed Resolving Dependencies --> Running transaction check ---> Package foremost.x86_64 0:1.5.7-13.1.el7 will be installed --> Finished Dependency Resolution epel/7/x86_64 | 4.7 kB 00:00:00 epel/7/x86_64/group_gz | 96 kB 00:00:00 epel/7/x86_64/updateinfo | 1.0 MB 00:00:00 epel/7/x86_64/primary_db | 7.0 MB 00:00:01 extras/7/x86_64 | 2.9 kB 00:00:00 extras/7/x86_64/primary_db | 243 kB 00:00:00 os/7/x86_64 | 3.6 kB 00:00:00 updates/7/x86_64 | 2.9 kB 00:00:00 updates/7/x86_64/primary_db | 12 MB 00:00:01 Dependencies Resolved ===================================================================================================================== Package Arch Version Repository Size ===================================================================================================================== Installing: foremost x86_64 1.5.7-13.1.el7 /foremost-1.5.7-13.1.el7.x86_64 85 k Transaction Summary ===================================================================================================================== Install 1 Package Total size: 85 k Installed size: 85 k Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : foremost-1.5.7-13.1.el7.x86_64 1/1 Verifying : foremost-1.5.7-13.1.el7.x86_64 1/1 Installed: foremost.x86_64 0:1.5.7-13.1.el7 Complete! [root@VM-0-3-centos ~]#
创建一个测试文件
[root@VM-0-3-centos ~]# echo "this is a important file">important.txt [root@VM-0-3-centos ~]# pwd /root [root@VM-0-3-centos ~]# ls connecttendis.sh important.txt restore tarlist tendis test.iso [root@VM-0-3-centos ~]# mkdir -p /tmp/restore
删除文件后尝试还原
[root@VM-0-3-centos ~]# rm important.txt [root@VM-0-3-centos ~]# foremost -i /dev/vda1 -o /tmp/restore/ Processing: /dev/vda1 |***********Segmentation fault
执行几分钟之后崩溃，恢复失败，打开目录查看发现：
[root@VM-0-3-centos ~]# ls /tmp/restore/ audit.txt bmp doc exe htm jpg mov mpg pdf ppt rar sdw sxc sxw wav xls zip avi dll docx gif jar mbd mp4 ole png pptx rif sx sxi vis wmv xlsx
看来与需要恢复的文件类型有关，换台机器再换一个png文件试试，先找一个showball.png测试文件，然后确认分区 /dev/vda1
[root@VM-0-3-centos ~]# df Filesystem 1K-blocks Used Available Use% Mounted on devtmpfs 930496 0 930496 0% /dev tmpfs 941004 24 940980 1% /dev/shm tmpfs 941004 508 940496 1% /run tmpfs 941004 0 941004 0% /sys/fs/cgroup /dev/vda1 51473868 6458344 42692404 14% / /dev/loop0 361650 361650 0 100% /mnt/iso tmpfs 188204 0 188204 0% /run/user/0 [root@VM-0-3-centos ~]# pwd /root [root@VM-0-3-centos ~]# ls restore showball.png
删除png文件后尝试恢复，进度条结束后即可进入指定的目录 /root/restore/ 查看
[root@VM-0-3-centos ~]# rm showball.png rm: remove regular file ‘showball.png'? y [root@VM-0-3-centos ~]# pwd /root [root@VM-0-3-centos ~]# foremost -t png -i /dev/vda1 -o /root/restore/ Processing: /dev/vda1 |*********************************************************************************************|
在指定目录下会有一个 audit.txt 统计文件和一个类型文件夹 png
[root@VM-0-3-centos ~]# ll restore/ total 40 -rw-r--r-- 1 root root 24548 Nov 27 22:57 audit.txt drwxr-xr-- 2 root root 16384 Nov 27 22:56 png [root@VM-0-3-centos ~]# cd restore/ [root@VM-0-3-centos restore]# ll png total 43764 -rw-r--r-- 1 root root 3500 Nov 27 22:53 00367400.png -rw-r--r-- 1 root root 3578 Nov 27 22:53 00367408.png -rw-r--r-- 1 root root 3445 Nov 27 22:53 00367416.png -rw-r--r-- 1 root root 368 Nov 27 22:53 00367432.png -rw-r--r-- 1 root root 363 Nov 27 22:53 00367456.png -rw-r--r-- 1 root root 392 Nov 27 22:53 00367464.png -rw-r--r-- 1 root root 199 Nov 27 22:53 00367616.png ...
png目录下的文件名都是一些编号，与原来删除的文件完全不一样了，需要根据 audit.txt 文件确认，打开文件确认一下：
[root@VM-0-3-centos restore]# head audit.txt Foremost version 1.5.7 by Jesse Kornblum, Kris Kendall, and Nick Mikus Audit File Foremost started at Sat Nov 27 22:53:48 2021 Invocation: foremost -t png -i /dev/vda1 -o /root/restore/ Output directory: /root/restore Configuration file: /etc/foremost.conf ------------------------------------------------------------------ File: /dev/vda1 Start: Sat Nov 27 22:53:48 2021 [root@VM-0-3-centos restore]# head -n 20 audit.txt Foremost version 1.5.7 by Jesse Kornblum, Kris Kendall, and Nick Mikus Audit File Foremost started at Sat Nov 27 22:53:48 2021 Invocation: foremost -t png -i /dev/vda1 -o /root/restore/ Output directory: /root/restore Configuration file: /etc/foremost.conf ------------------------------------------------------------------ File: /dev/vda1 Start: Sat Nov 27 22:53:48 2021 Length: 49 GB (53686025728 bytes) Num Name (bs=512) Size File Offset Comment 0: 00367400.png 3 KB 188108800 (16 x 16) 1: 00367408.png 3 KB 188112896 (16 x 16) 2: 00367416.png 3 KB 188116992 (16 x 16) 3: 00367432.png 368 B 188125184 (16 x 16) 4: 00367456.png 363 B 188137472 (16 x 16) 5: 00367464.png 392 B 188141568 (16 x 16) ...
audit.txt 文件中记录着恢复文件的简要信息，这需要你知道原来删除文件的相关信息，不然就只能一个个打开查看了，我是通过分辨率查找的
[root@VM-0-3-centos restore]# grep "1217" audit.txt 116: 12888200.png 40 KB 6598758400 (1217 x 690) 360: 38088960.png 40 KB 19501547520 (1217 x 690)
根据过滤出的信息把 12888200.png 打开发现就是自己“误删”的文件这就恢复好了
使用extundelete找回文件
extundelete 支持ext3、ext4文件系统下的文件恢复，使用 cat /etc/fstab 可以在linux环境下查看文件系统类型
[root@VM-0-3-centos ~]# cat /etc/fstab UUID=21dbe030-aa71-4b3a-8610-3b942dd447fa / ext4 noatime,acl,user_xattr 1 1 proc /proc proc defaults 0 0 sysfs /sys sysfs noauto 0 0 debugfs /sys/kernel/debug debugfs noauto 0 0 devpts /dev/pts devpts mode=0620,gid=5 0 0 [root@VM-0-3-centos ~]#
安装依赖文件
[root@VM-0-3-centos ~]# yum install e2fsprogs-devel Loaded plugins: fastestmirror, langpacks Repository epel is listed more than once in the configuration Determining fastest mirrors epel | 4.7 kB 00:00:00 extras | 2.9 kB 00:00:00 os | 3.6 kB 00:00:00 updates | 2.9 kB 00:00:00 (1/2): epel/7/x86_64/updateinfo | 1.0 MB 00:00:00 (2/2): epel/7/x86_64/primary_db | 7.0 MB 00:00:01 Resolving Dependencies --> Running transaction check ---> Package e2fsprogs-devel.x86_64 0:1.42.9-19.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved =============================================================================================================== Package Arch Version Repository Size =============================================================================================================== Installing: e2fsprogs-devel x86_64 1.42.9-19.el7 os 73 k Transaction Summary =============================================================================================================== Install 1 Package Total download size: 73 k Installed size: 162 k Is this ok [y/d/N]: y Downloading packages: e2fsprogs-devel-1.42.9-19.el7.x86_64.rpm | 73 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : e2fsprogs-devel-1.42.9-19.el7.x86_64 1/1 Verifying : e2fsprogs-devel-1.42.9-19.el7.x86_64 1/1 Installed: e2fsprogs-devel.x86_64 0:1.42.9-19.el7 Complete! [root@VM-0-3-centos ~]#
下载extundelete源码
[root@VM-0-3-centos ~]# wget https://src.fedoraproject.org/repo/pkgs/extundelete/extundelete-0.2.4.tar.bz2/77e626ad31433680c0a222069295d2ca/extundelete-0.2.4.tar.bz2 --2021-11-28 18:36:15-- https://src.fedoraproject.org/repo/pkgs/extundelete/extundelete-0.2.4.tar.bz2/77e626ad31433680c0a222069295d2ca/extundelete-0.2.4.tar.bz2 Resolving src.fedoraproject.org (src.fedoraproject.org)... 38.145.60.20, 38.145.60.21 Connecting to src.fedoraproject.org (src.fedoraproject.org)|38.145.60.20|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 108472 (106K) [application/x-bzip2] Saving to: ‘extundelete-0.2.4.tar.bz2' 100%[============================================================================>] 108,472 33.5KB/s in 3.2s 2021-11-28 18:36:20 (33.5 KB/s) - ‘extundelete-0.2.4.tar.bz2' saved [108472/108472] [root@VM-0-3-centos ~]# ls extundelete-0.2.4.tar.bz2
解压extundelete源码
[root@VM-0-3-centos ~]# tar -jxvf extundelete-0.2.4.tar.bz2 extundelete-0.2.4/ extundelete-0.2.4/acinclude.m4 extundelete-0.2.4/missing extundelete-0.2.4/autogen.sh extundelete-0.2.4/aclocal.m4 extundelete-0.2.4/configure extundelete-0.2.4/LICENSE extundelete-0.2.4/README extundelete-0.2.4/install-sh extundelete-0.2.4/config.h.in extundelete-0.2.4/src/ extundelete-0.2.4/src/extundelete.cc extundelete-0.2.4/src/block.h extundelete-0.2.4/src/kernel-jbd.h extundelete-0.2.4/src/insertionops.cc extundelete-0.2.4/src/block.c extundelete-0.2.4/src/cli.cc extundelete-0.2.4/src/extundelete-priv.h extundelete-0.2.4/src/extundelete.h extundelete-0.2.4/src/jfs_compat.h extundelete-0.2.4/src/Makefile.in extundelete-0.2.4/src/Makefile.am extundelete-0.2.4/configure.ac extundelete-0.2.4/depcomp extundelete-0.2.4/Makefile.in extundelete-0.2.4/Makefile.am [root@VM-0-3-centos ~]# cd extundelete-0.2.4/ [root@VM-0-3-centos extundelete-0.2.4]# ls acinclude.m4 aclocal.m4 autogen.sh config.h.in configure configure.ac depcomp install-sh LICENSE Makefile.am Makefile.in missing README src [root@VM-0-3-centos extundelete-0.2.4]#
编译xtundelete源码安装
[root@VM-0-3-centos extundelete-0.2.4]# ./configure --prefix=/usr/local/extundelete && make && make install
Configuring extundelete 0.2.4
Writing generated files to disk
make -s all-recursive
Making all in src
extundelete.cc: In function ‘ext2_ino_t find_inode(ext2_filsys, ext2_filsys, ext2_inode*, std::string, int)':
extundelete.cc:1272:29: warning: narrowing conversion of ‘search_flags' from ‘int' to ‘ext2_ino_t {aka unsigned int}' inside { } [-Wnarrowing]
buf, match_name2, priv, 0};
^
Making install in src
/usr/bin/install -c extundelete '/usr/local/extundelete/bin'
[root@VM-0-3-centos extundelete-0.2.4]# which extundelete
/usr/bin/which: no extundelete in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
[root@VM-0-3-centos extundelete-0.2.4]# ll /usr/local/extundelete/bin/
total 1296
-rwxr-xr-x 1 root root 1323360 Nov 28 18:45 extundelete
如果在这一步报错 configure: error: C++ compiler cannot create executables，可以运行 yum -y install gcc-c++ 命令安装编译环境
准备测试文件
[root@VM-0-3-centos examples]# df -T Filesystem Type 1K-blocks Used Available Use% Mounted on devtmpfs devtmpfs 930496 0 930496 0% /dev tmpfs tmpfs 941004 24 940980 1% /dev/shm tmpfs tmpfs 941004 508 940496 1% /run tmpfs tmpfs 941004 0 941004 0% /sys/fs/cgroup /dev/vda1 ext4 51473868 6465732 42685016 14% / /dev/loop0 iso9660 361650 361650 0 100% /mnt/iso tmpfs tmpfs 188204 0 188204 0% /run/user/0 [root@VM-0-3-centos examples]# cp ../extundelete-0.2.4.tar.bz2 . [root@VM-0-3-centos examples]# ls extundelete-0.2.4.tar.bz2
查询文件的inode信息
我们选择刚刚下载的extundelete源码包作为“误删”的文件，先查看一下信息，-li 可以在第一列查看文件的inode信息，examples文件夹的inode值为1311798：
[root@VM-0-3-centos ~]# ls examples/ extundelete-0.2.4.tar.bz2 [root@VM-0-3-centos ~]# ls -li total 361676 1311798 drwxr-xr-x 2 root root 4096 Nov 28 20:28 examples 1310761 drwxr-xr-x 3 1000 1000 4096 Nov 28 18:45 extundelete-0.2.4 918157 drwxr-xr-x 2 root root 4096 Feb 28 2021 tarlist 396057 -rw-r--r-- 1 root root 370329600 Feb 27 2021 test.iso
删除测试文件，并用查询信息
[root@VM-0-3-centos ~]# cd examples/ [root@VM-0-3-centos examples]# ls extundelete-0.2.4.tar.bz2 [root@VM-0-3-centos examples]# rm extundelete-0.2.4.tar.bz2 -f [root@VM-0-3-centos examples]# ls [root@VM-0-3-centos examples]# /usr/local/extundelete/bin/extundelete /dev/vda1 --inode 1311798 NOTICE: Extended attributes are not restored. WARNING: EXT3_FEATURE_INCOMPAT_RECOVER is set. The partition should be unmounted to undelete any files without further data loss. If the partition is not currently mounted, this message indicates it was improperly unmounted, and you should run fsck before continuing. If you decide to continue, extundelete may overwrite some of the deleted files and make recovering those files impossible. You should unmount the file system and check it with fsck before using extundelete. Would you like to continue? (y/n) y Loading filesystem metadata ... 400 groups loaded. Group: 160 Contents of inode 1311798: 0000 | ed 41 00 00 00 10 00 00 7a 62 a3 61 1b 7a a3 61 | .A......zb.a.z.a 0010 | 1b 7a a3 61 00 00 00 00 00 00 02 00 08 00 00 00 | .z.a............ 0020 | 00 00 08 00 0b 00 00 00 0a f3 01 00 04 00 00 00 | ................ 0030 | 00 00 00 00 00 00 00 00 01 00 00 00 79 20 50 00 | ............y P. 0040 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ 0050 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ 0060 | 00 00 00 00 7c 63 ab ad 00 00 00 00 00 00 00 00 | ....|c.......... 0070 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ 0080 | 1c 00 00 00 80 da 0d a3 80 da 0d a3 94 24 04 08 | .............$.. 0090 | 7a 62 a3 61 94 24 04 08 00 00 00 00 00 00 00 00 | zb.a.$.......... 00a0 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ 00b0 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ 00c0 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ 00d0 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ 00e0 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ 00f0 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ Inode is Allocated File mode: 16877 Low 16 bits of Owner Uid: 0 Size in bytes: 4096 Access time: 1638097530 Creation time: 1638103579 Modification time: 1638103579 Deletion Time: 0 Low 16 bits of Group Id: 0 Links count: 2 Blocks count: 8 File flags: 524288 File version (for NFS): 2913690492 File ACL: 0 Directory ACL: 0 Fragment address: 0 Direct blocks: 127754, 4, 0, 0, 1, 5251193, 0, 0, 0, 0, 0, 0 Indirect block: 0 Double indirect block: 0 Triple indirect block: 0 File name | Inode number | Deleted status . 1311798 .. 393219 extundelete-0.2.4.tar.bz2 396764 Deleted conftest.err 1311833 Deleted [root@VM-0-3-centos examples]#
我们发现 extundelete-0.2.4.tar.bz2 文件的状态为 Deleted
使用extundelete恢复文件
[root@VM-0-3-centos ~]# /usr/local/extundelete/bin/extundelete /dev/vda1 --restore-directory /tmp NOTICE: Extended attributes are not restored. WARNING: EXT3_FEATURE_INCOMPAT_RECOVER is set. The partition should be unmounted to undelete any files without further data loss. If the partition is not currently mounted, this message indicates it was improperly unmounted, and you should run fsck before continuing. If you decide to continue, extundelete may overwrite some of the deleted files and make recovering those files impossible. You should unmount the file system and check it with fsck before using extundelete. Would you like to continue? (y/n) y Loading filesystem metadata ... 400 groups loaded. Loading journal descriptors ... 31842 descriptors loaded. *** Error in `/usr/local/extundelete/bin/extundelete': double free or corruption (!prev): 0x00000000014d6020 *** ======= Backtrace: ========= /lib64/libc.so.6(+0x81299)[0x7f5c08190299] /usr/local/extundelete/bin/extundelete[0x40cdcb] /usr/local/extundelete/bin/extundelete[0x40fee6] /usr/local/extundelete/bin/extundelete[0x4045b4] /lib64/libc.so.6(__libc_start_main+0xf5)[0x7f5c08131555] /usr/local/extundelete/bin/extundelete[0x404aef] ======= Memory map: ======== 00400000-0041c000 r-xp 00000000 fd:01 1311942 /usr/local/extundelete/bin/extundelete 0061c000-0061d000 r--p 0001c000 fd:01 1311942 /usr/local/extundelete/bin/extundelete 0061d000-0061e000 rw-p 0001d000 fd:01 1311942 /usr/local/extundelete/bin/extundelete 0061e000-0061f000 rw-p 00000000 00:00 0 014c6000-0176e000 rw-p 00000000 00:00 0 [heap] 7f5c00000000-7f5c00021000 rw-p 00000000 00:00 0 7f5c00021000-7f5c04000000 ---p 00000000 00:00 0 7f5c07ca1000-7f5c07ef3000 rw-p 00000000 00:00 0 7f5c07ef3000-7f5c07f0a000 r-xp 00000000 fd:01 265649 /usr/lib64/libpthread-2.17.so 7f5c07f0a000-7f5c08109000 ---p 00017000 fd:01 265649 /usr/lib64/libpthread-2.17.so 7f5c08109000-7f5c0810a000 r--p 00016000 fd:01 265649 /usr/lib64/libpthread-2.17.so 7f5c0810a000-7f5c0810b000 rw-p 00017000 fd:01 265649 /usr/lib64/libpthread-2.17.so 7f5c0810b000-7f5c0810f000 rw-p 00000000 00:00 0 7f5c0810f000-7f5c082d2000 r-xp 00000000 fd:01 265623 /usr/lib64/libc-2.17.so 7f5c082d2000-7f5c084d2000 ---p 001c3000 fd:01 265623 /usr/lib64/libc-2.17.so 7f5c084d2000-7f5c084d6000 r--p 001c3000 fd:01 265623 /usr/lib64/libc-2.17.so 7f5c084d6000-7f5c084d8000 rw-p 001c7000 fd:01 265623 /usr/lib64/libc-2.17.so 7f5c084d8000-7f5c084dd000 rw-p 00000000 00:00 0 7f5c084dd000-7f5c084f2000 r-xp 00000000 fd:01 291206 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7f5c084f2000-7f5c086f1000 ---p 00015000 fd:01 291206 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7f5c086f1000-7f5c086f2000 r--p 00014000 fd:01 291206 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7f5c086f2000-7f5c086f3000 rw-p 00015000 fd:01 291206 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7f5c086f3000-7f5c087f4000 r-xp 00000000 fd:01 287349 /usr/lib64/libm-2.17.so 7f5c087f4000-7f5c089f3000 ---p 00101000 fd:01 287349 /usr/lib64/libm-2.17.so 7f5c089f3000-7f5c089f4000 r--p 00100000 fd:01 287349 /usr/lib64/libm-2.17.so 7f5c089f4000-7f5c089f5000 rw-p 00101000 fd:01 287349 /usr/lib64/libm-2.17.so 7f5c089f5000-7f5c08ade000 r-xp 00000000 fd:01 266798 /usr/lib64/libstdc++.so.6.0.19 7f5c08ade000-7f5c08cde000 ---p 000e9000 fd:01 266798 /usr/lib64/libstdc++.so.6.0.19 7f5c08cde000-7f5c08ce6000 r--p 000e9000 fd:01 266798 /usr/lib64/libstdc++.so.6.0.19 7f5c08ce6000-7f5c08ce8000 rw-p 000f1000 fd:01 266798 /usr/lib64/libstdc++.so.6.0.19 7f5c08ce8000-7f5c08cfd000 rw-p 00000000 00:00 0 7f5c08cfd000-7f5c08d3f000 r-xp 00000000 fd:01 267873 /usr/lib64/libext2fs.so.2.4 7f5c08d3f000-7f5c08f3f000 ---p 00042000 fd:01 267873 /usr/lib64/libext2fs.so.2.4 7f5c08f3f000-7f5c08f40000 r--p 00042000 fd:01 267873 /usr/lib64/libext2fs.so.2.4 7f5c08f40000-7f5c08f42000 rw-p 00043000 fd:01 267873 /usr/lib64/libext2fs.so.2.4 7f5c08f42000-7f5c08f45000 r-xp 00000000 fd:01 265948 /usr/lib64/libcom_err.so.2.1 7f5c08f45000-7f5c09144000 ---p 00003000 fd:01 265948 /usr/lib64/libcom_err.so.2.1 7f5c09144000-7f5c09145000 r--p 00002000 fd:01 265948 /usr/lib64/libcom_err.so.2.1 7f5c09145000-7f5c09146000 rw-p 00003000 fd:01 265948 /usr/lib64/libcom_err.so.2.1 7f5c09146000-7f5c09168000 r-xp 00000000 fd:01 265614 /usr/lib64/ld-2.17.so 7f5c092b1000-7f5c0935d000 rw-p 00000000 00:00 0 7f5c09363000-7f5c09367000 rw-p 00000000 00:00 0 7f5c09367000-7f5c09368000 r--p 00021000 fd:01 265614 /usr/lib64/ld-2.17.so 7f5c09368000-7f5c09369000 rw-p 00022000 fd:01 265614 /usr/lib64/ld-2.17.so 7f5c09369000-7f5c0936a000 rw-p 00000000 00:00 0 7ffe581db000-7ffe581fc000 rw-p 00000000 00:00 0 [stack] 7ffe581fc000-7ffe581fe000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall] Aborted [root@VM-0-3-centos ~]#
恢复失败，此路不通！！！
有其他人成功了，但是我测试失败，释放内存崩溃，有大神给说一下怎么改源码吗？此处存疑，后续再测，先记录一下常用参数。
查询inode文件状态：/usr/local/extundelete/bin/extundelete /dev/vda1 --inode 1311798
恢复指定节点数据：/usr/local/extundelete/bin/extundelete /dev/vda1 --restore-inode 1311798
恢复单个文件：/usr/local/extundelete/bin/extundelete /dev/vda1 --restore-file root/examples/extundelete-0.2.4.tar.bz2
恢复一个目录：/usr/local/extundelete/bin/extundelete /dev/vda1 --restore-files root/examples
恢复所有文件：/usr/local/extundelete/bin/extundelete /dev/vda1 --restore-all
预防误删引发的事故
定义别名，提示删除
定义别名 alias rm='rm -i'， 在删除文件前会出现一个提示，使用 -i 选项来需要逐个确认要删除的文件，只有用户输入 y 才会将文件删除，但是这种做法在加上 -f 选项之后会失效。
禁用rm，使用mv代替
在系统中不允许直接使用rm命令直接删除文件，需要mv文件到指定的回收目录 /.delete，然后配合一个定时任务，每周清空/.delete下文件，相当于手动创建了一个回收站。
总结
使用foremost恢复时的目标目录最好是另外一个磁盘中的目录，把文件恢复到被删除文件所在的磁盘中很可能会在恢复前覆盖被误删的文件
sodu 的全称目前有 substitute user do 和 super user do 两种说法，使用sudo通常是行驶超级用户的权限，但有时也可以其他普通用户，所以翻译成 substitute user do 代替其他用户来做更准确一点
foremost 支持的文件系统比较多，其中包括 ext2、 ext3 、vfat、NTFS、ufs、jfs 等，但是只能恢复特定格式的文件，而 extundelete 只支持ext3、ext4文件系统，不过可恢复的文件类型很多。
除了本文中总结的这两款不怎么好用的恢复软件，还有 testdisk 和 photorec 可以用来恢复，后续可以尝试一下数据无价，请谨慎删除，可参考别名方法或禁用 rm -rf 来减少事故的发生
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