在linux中extundelete恢复已删除的数据文件

  extundelete就是用来恢复文件了,只要我们删除后的文件没有被覆盖就可以常用使用此工具来恢复了,下面来看个例子.
 
  因为人员离职闹得不愉快,系统工程师离职后,由于公司未及时关闭其vpn,数据库服务器(Linux 6.5 Oracle 11.2.0.1)帐号未及时被修改,最后直接上去rm ORACLE_BASE给干掉,悲剧的是ORADATA目录也在里面,更加悲剧的是所有数据文件都在里面.也就是说数据库彻底被删除,而且没有任何备份.朋友咨询了我,让我给予支持.最后比较幸运,文件没有被覆盖,inode都还在,通过extundelete顺利恢复所有数据文件,控制文件,redo文件(extundelete恢复Linux被删除文件),数据库顺利打开,实现0丢失,算是一次完美的恢复,代码如下:
 
  [root@DB1 tmp]# tar xvf extundelete-0.2.4.tar  
  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@DB1 tmp]# cd extundelete-0.2.4
  [root@DB1 extundelete-0.2.4]# ./configure  
  Configuring extundelete 0.2.4
  Writing generated files to disk
  [root@DB1 extundelete-0.2.4]# make && make install
  make -s all-recursive
  Making all in src
  Making install in src
    /usr/bin/install -c extundelete '/usr/local/bin'
  [root@DB1 extundelete-0.2.4]# df -h
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/sda3       244G   11G  221G   5% /
  tmpfs            16G   72K   16G   1% /dev/shm
  /dev/sda1       190M   62M  119M  35% /boot
  /dev/sdb1       2.0T   71M  1.9T   1% /home
  [root@DB1 extundelete-0.2.4]# umount /dev/sdb1
  umount: /home: device is busy.
          (In some cases useful info about processes that use
           the device is found by lsof(8) or fuser(1))
  [root@DB1 extundelete-0.2.4]# fuser -m -u /home
  /home:                3914c(oracle)  8372c(oracle)
  [root@DB1 extundelete-0.2.4]# kill -9 3914
  [root@DB1 extundelete-0.2.4]# fuser -m -u /home
  /home:                8372c(oracle)
  [root@DB1 extundelete-0.2.4]# kill -9 8372
  [root@DB1 extundelete-0.2.4]# fuser -m -u /home
  [root@DB1 extundelete-0.2.4]# umount /dev/sdb1
  [root@DB1 extundelete-0.2.4]# df -h
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/sda3       244G   11G  221G   5% /
  tmpfs            16G   72K   16G   1% /dev/shm
  /dev/sda1       190M   62M  119M  35% /boot
  [root@DB1 extundelete-0.2.4]# extundelete /dev/sdb1 --restore-all
  NOTICE: Extended attributes are not restored.
  Loading filesystem metadata ... 16384 groups loaded.
  Loading journal descriptors ... 26542 descriptors loaded.
  Searching for recoverable inodes in directory / ...  
  18896 recoverable inodes found.
  Looking through the directory structure for deleted files ...  
  2 recoverable inodes still lost.
  Unable to restore inode 43778050 (file.43778050): Space has been reallocated.
  [root@DB1 extundelete-0.2.4]# ls
  acinclude.m4  autogen.sh  config.h.in  config.status  configure.ac  install-sh  Makefile     Makefile.in
  aclocal.m4    config.h    config.log   configure      depcomp       LICENSE     Makefile.am  missing     
  [root@DB1 extundelete-0.2.4]# cd RECOVERED_FILES/
  [root@DB1 RECOVERED_FILES]# ls
  app  file.43778051  oracle  oraInventory
  [root@DB1 RECOVERED_FILES]# cd app
  [root@DB1 app]# ls
  admin  cfgtoollogs  diag  oracle  oradata  orcl  ORCL
  [root@DB1 app]# cd oradata  //phpfensi.com
  [root@DB1 oradata]# ls
  orcl
  [root@DB1 oradata]# cd orcl
  [root@DB1 orcl]# ls
  control01.ctl  redo01.log  redo02.log  redo03.log  sysaux01.dbf  system01.dbf  undotbs01.dbf  users01.dbf
  [root@DB1 orcl]# ls -ltr
  total 2908776
  -rw-r--r--. 1 root root  734011392 Nov 18 02:06 system01.dbf
  -rw-r--r--. 1 root root 1069555712 Nov 18 02:06 sysaux01.dbf
  -rw-r--r--. 1 root root  120594432 Nov 18 02:06 undotbs01.dbf
  -rw-r--r--. 1 root root  887365632 Nov 18 02:06 users01.dbf
  -rw-r--r--. 1 root root    9748480 Nov 18 02:06 control01.ctl
  -rw-r--r--. 1 root root   52429312 Nov 18 02:06 redo01.log
  -rw-r--r--. 1 root root   52429312 Nov 18 02:06 redo02.log
  -rw-r--r--. 1 root root   52429312 Nov 18 02:06 redo03.log
  [root@DB1 orcl]#
  再次提醒各位:数据库备份重于一切,防天灾的同时还要防人灾,也希望圈子里面以后不要听到类似故障.

dawei

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