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centos 6如何恢復被刪除了的boot分區

Centos6系統/boot分區被刪除了,但是又不想重新安裝系統,下面介紹一種快速的方法恢復boot分區。

1.首先利用centos6鏡像進入linux rescue救援模式。

2.啟動sshd服務,查看eth0獲取的ip地址,然後用ssh secure shell 連接。

SSH Secure Shell 3.2.9 (Build 283)

Copyright (c) 2000-2003 SSH Communications Security Corp - http://www.ssh.com/

This copy of SSH Secure Shell is a non-commercial version.

This version does not include PKI and PKCS #11 functionality.

[root@localhost ~]# cd /boot //進入/boot分區

[root@localhost boot]# ls //查看boot分區的內容

config-2.6.32-71.el6.i686         symvers-2.6.32-71.el6.i686.gz

grub                              System.map-2.6.32-71.el6.i686

initramfs-2.6.32-71.el6.i686.img  vmlinuz-2.6.32-71.el6.i686

[root@localhost boot]# cd ..//返回上層目錄

[root@localhost /]# rm -rf /boot/*//刪除/boot分區所有內容

[root@localhost /]# ls /boot//查看/boot分區內容為空

[root@localhost /]# mount /dev/sr0 /mnt//掛載cdrom設備到/mnt目錄下

mount: block device /dev/sr0 is write-protected, mounting read-only

[root@localhost /]# rpm -ivh /mnt/Packages/kernel-2.6.32-71.el6.i686.rpm --root=/ --force //安裝光盤的kernel軟件包

Preparing...                ########################################### [100%]

1:kernel                 ########################################### [100%]

[root@localhost /]# ls /boot //查看/boot分區內容

config-2.6.32-71.el6.i686         System.map-2.6.32-71.el6.i686

initramfs-2.6.32-71.el6.i686.img  vmlinuz-2.6.32-71.el6.i686

symvers-2.6.32-71.el6.i686.gz

[root@localhost /]# mkdir /boot/grub//在/boot目錄新建一個grub目錄

[root@localhost /]# touch /boot/grub/grub.conf//新建一個grub.conf配置文件

[root@localhost /]# cp -rf /usr/share/grub/i386-pc/* /boot/grub/ //把/usr/share/grub/i386-pc的所有內容拷貝到/boot/grub中。

[root@localhost /]# ls /boot//查看/boot分區內容

config-2.6.32-71.el6.i686         symvers-2.6.32-71.el6.i686.gz

grub                              System.map-2.6.32-71.el6.i686

initramfs-2.6.32-71.el6.i686.img  vmlinuz-2.6.32-71.el6.i686

[root@localhost /]# ls /boot/grub/ //查看/boot/grub目錄內容

e2fs_stage1_5  iso9660_stage1_5   stage1           vstafs_stage1_5

fat_stage1_5   jfs_stage1_5       stage2           xfs_stage1_5

ffs_stage1_5   minix_stage1_5     stage2_eltorito

grub.conf      reiserfs_stage1_5  ufs2_stage1_5

[root@localhost /]# fdisk -l //查看分區

Disk /dev/sda: 21.5 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000b1db4

Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          13      102400   83  Linux//這個為/boot啟動分區

Partition 1 does not end on cylinder boundary.

/dev/sda2              13         144     1048576   82  Linux swap / Solaris

Partition 2 does not end on cylinder boundary.

/dev/sda3             144        2611    19819520   83  Linux //這個為/根分區

[root@localhost /]# mount//查看所有掛載分區

/dev/sda3 on / type ext4 (rw)//根分區

/dev/sda1 on /boot type ext4 (rw)//boot分區為sda1

devpts on /dev/pts type devpts (rw)

tmpfs on /dev/shm type tmpfs (rw)

proc on /proc type proc (rw)

sysfs on /sys type sysfs (rw)

/dev/sr0 on /mnt type iso9660 (ro)

[root@localhost /]# grub//啟動grub

Probing devices to guess BIOS drives. This may take a long time.

GNU GRUB  version 0.97  (640K lower / 3072K upper memory)

[ Minimal BASH-like line editing is supported.  For the first word, TAB

lists possible command completions.  Anywhere else TAB lists the possible

completions of a device/filename.]

grub> root (hd0,0) //首先find /grub/stage1查看/boot分區為(hd0,0)

root (hd0,0)//設置/boot分區為/dev/sda1

Filesystem type is ext2fs, partition type 0x83

grub> setup (hd0)//重新安裝grub

setup (hd0)

Checking if "/boot/grub/stage1" exists... no

Checking if "/grub/stage1" exists... yes

Checking if "/grub/stage2" exists... yes

Checking if "/grub/e2fs_stage1_5" exists... yes

Running "embed /grub/e2fs_stage1_5 (hd0)"...  26 sectors are embedded.

succeeded

Running "install /grub/stage1 (hd0) (hd0)1+26 p (hd0,0)/grub/stage2 /grub/grub.conf"... succeeded

Done.

grub> quit//退出

3.重新reboot啟動系統進入grub界面測試

4.查找find /grub/stage1然後找到/boot分區為(hd0,0),指定kernel,initrd, boot啟動系統成功。

5.系統啟動成功,然後進入系統重新寫/boot/grub/grub.conf文件。

6.[root@localhost /]# vi /boot/grub/grub.conf配置文件如下:

最後填寫grub.conf文件內容

default=0 //默認菜單為第一個

timeout=6//等待時間為6秒

title mylinux //啟動標題為mylinux

root (hd0,0) //boot所在分區為/dev/sda1

kernel /vmlinuz-2.6.32-71.el6.i686 ro root=/dev/sda3 rhgb quiet//kernel所在位置以只讀模式掛載/dev/sda3根分區rhgb quiet為安靜模式不顯示內核信息。

initrd /initramfs-2.6.32-71.el6.i686.img//加載initrd鏡像。

7.最後進入linux rescue重建一個grub

8.最後啟動界面如下

本文出自 “有志者事竟成!” 博客,請務必保留此出處http://zh888.blog.51cto.com/1684752/902574

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