可能出现的故障:

1,管理员密码忘记

  进入单用户模式修改密码

2.系统无法正常启动

  a.grub损坏(MBR损坏,grub配置文件丢失)

  b.系统初始化故障(某文件系统无法正常挂载、驱动不兼容)

  c.服务故障

  d. 用户无法登陆系统(bash程序故障)

3.命令无法运行

4.编译过程无法继续(开发环境缺少基本组件)

模拟故障

1 MBR损坏

  1.1.先备份好MBR:dd if=/dev/sda of=/root/mbr.back  bs=512 count=1
说明:主引导记录512字节中前446是MBR代码(即:bootloader),后64字节包含分区表信息,最后2字节标识是MBR。(在装双系统的时候一般本分的是前446个字节)

  1.2.破坏掉MBR:

 dd if=/dev/zero of=/dev/sda count= bs=
sync
3 shutdown -r now  

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alt="" /> 

解决办法:

  1.  借助别的主机的进行恢复

  2. 使用紧急救援模式

    a. boot.iso

    b. 使用完整的系统安装盘

在紧急救援模式下,文件系统都被挂载到/mnt/sysimage下(read-only,rw)

 root (hd0,)

 setup (hd0)

 quit

 sync

 reboot

  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alt="" />

grub配置文件丢失

  mv /boot/grub/grub.conf /root/,系统重启将直接进入grub
解决办法:

aaarticlea/png;base64,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alt="" />

root (hd0,)

kernel /vmlinuz-(再按tab键)

initrd /initrd-(再按tab键)

boot

如果不小心 rm -rf /bin/bash,系统将不能正常开机

按F2通过光盘启动进入紧急救援模式,通过挂在光盘的方式安装bash.rpm:

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