对比备份文件：

shell> head -5 /var/log/message_bac
Nov 14 03:11:11 localhost kernel: imklog 5.8.10, log source = /proc/kmsg started.
Nov 14 03:11:11 localhost rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="1241" x-info="http://www.rsyslog.com"] start
Nov 14 03:11:11 localhost kernel: Initializing cgroup subsys cpuset
Nov 14 03:11:11 localhost kernel: Initializing cgroup subsys cpu
Nov 14 03:11:11 localhost kernel: Linux version 2.6.32-431.el6.x86_64 (mockbuild@c6b8.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) ) #1 SMP Fri Nov 22 03:15:09 UTC 2013

对比发现数据是一样的，恢复

shell> cat 1 > /var/log/messages

再次提醒，恢复前提是这个进程必须存在。

3.使用extundelete工具

extundelete工具安装

• extundelete下载地址：http://extundelete.sourceforge.net/

wget https://nchc.dl.sourceforge.net/project/extundelete/extundelete/0.2.4/extundelete-0.2.4.tar.bz2

解压该文件tar jxvf extundelete-0.2.4.tar.bz2

若报这种错误

[root@docking ~]# tar jxvf extundelete-0.2.4.tar.bz2 
tar (child): bzip2：无法 exec: 没有那个文件或目录
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now

则使用yum -y install bzip2进行解决

[root@docking ~]# 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
...................................................

cd  extundelete-0.2.4
./configure 

若这步骤报错

[root@docking extundelete-0.2.4]# ./configure 
Configuring extundelete 0.2.4
configure: error: in `/root/extundelete-0.2.4':
configure: error: C++ compiler cannot create executables
See `config.log' for more details

则使用yum -y install gcc-c++解决.

若执行上一步仍然报错，

[root@docking extundelete-0.2.4]# ./configure 
Configuring extundelete 0.2.4
configure: error: Can't find ext2fs library

则使用yum -y install e2fsprogs e2fsprogs-devel来解决。
#Ubuntu的解决办法为sudo apt-get install e2fslibs-dev e2fslibs-dev

不出意外的话到这里应该configure能够顺利完成.

[root@docking extundelete-0.2.4]# ./configure 
Configuring extundelete 0.2.4
Writing generated files to disk
[root@docking extundelete-0.2.4]# 

最后make然后 make install

[root@docking extundelete-0.2.4]# make
make -s all-recursive
Making all in src
extundelete.cc: 在函数‘ext2_ino_t find_inode(ext2_filsys, ext2_filsys, ext2_inode*, std::string, int)’中:
extundelete.cc:1272:29: 警告：在 {} 内将‘search_flags’从‘int’转换为较窄的类型‘ext2_ino_t {aka unsigned int}’ [-Wnarrowing]
    buf, match_name2, priv, 0};
                             ^
[root@docking extundelete-0.2.4]# make install
Making install in src
  /usr/bin/install -c extundelete '/usr/local/bin'

extundelete安装完成.

扫描误删除的文件：

使用df -lh查看挂载：