標籤:恢複boot分區
在CentOS 6系統中,因為不小心或操作失誤導致boot分區被刪除,
遇到這種情況是否能夠恢複被刪除的boot分區呢?
1.首先利用centos6鏡像進入linux rescue救援模式。
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2.啟動sshd服務,查看eth0擷取的ip地址,然後用ssh secure shell 串連。
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. [[email protected] ~]# cd /boot //進入/boot分區 [[email protected] 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 [[email protected] boot]# cd 。。//返回上層目錄 [[email protected] /]# rm -rf /boot/*//刪除/boot分區所有內容 [[email protected] /]# ls /boot//查看/boot分區內容為空白 [[email protected] /]# mount /dev/sr0 /mnt//掛載cdrom裝置到/mnt目錄下 mount: block device /dev/sr0 is write-protected, mounting read-only [[email protected] /]# rpm -ivh /mnt/Packages/kernel-2.6.32-71.el6.i686.rpm --root=/ --
force //安裝光碟片的kernel軟體包
Preparing.。。 ########################################### [100%] 1:kernel ########################################### [100%] [[email protected] /]# 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 [[email protected] /]# mkdir /boot/grub//在/boot目錄建立一個grub目錄 [[email protected] /]# touch /boot/grub/grub.conf//建立一個grub.conf設定檔 [[email protected] /]# 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。
[[email protected] /]# 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 [[email protected] /]# 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 [[email protected] /]# 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開機磁碟分割 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 [[email protected] /]# 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) [[email protected] /]# 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)//設定/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介面測試
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4.尋找find /grub/stage1然後找到/boot分區為(hd0,0),指定kernel,initrd, boot啟動系統成功。
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5.系統啟動成功,然後進入系統重新寫/boot/grub/grub.conf檔案。
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6.[[email protected] /]# vi /boot/grub/grub.conf設定檔如下:
最後填寫grub.conf檔案內容
default=0 //預設菜單為第一個
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所在位置以唯讀模式掛載/dev/sda3根分區rhgb quiet為安靜模式不顯示核心資訊。
initrd /initramfs-2.6.32-71.el6.i686.img//載入initrd鏡像。
7.最後進入linux rescue重建一個grub
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8.最後啟動介面如下
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上面就是CentOS 6恢複被刪除boot分區的方法介紹了,步驟有些長,如果覺得麻煩的話可以重裝系統,同樣能恢複boot分區。
本文出自 “我是一隻小小鳥” 部落格,請務必保留此出處http://liyanchao.blog.51cto.com/9954601/1659891
CentOS 6系統中/boot恢複被刪除的/boot分區 簡單介紹