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1、REDHAT6.3_X64 BOOT分区丢失或者误删除重建1 光盘引导进入rescue模式 或者 USB闪存光驱引导进入rescue模式2 输入 chroot /mnt/sysimage3 清空boot目录以及boot分区。将boot分区挂载到boot目录。一般我们将第一块硬盘的第一块分区作为boot分区，分区格式ext34 挂载光盘 5 进入光盘Packages目录 执行 rpm -ivh kernel-2.6.32-279.el6.x86_64.rpm -root=/ -force6 ls /boot /查看/boot分区内容config-2.6.32-279.el6.x86_64 sym
2、vers-2.6.32-279.el6.x86_64.gz System.map-2.6.32-279.el6.x86_64initramfs-2.6.32-279.el6.x86_64.img vmlinuz-2.6.32-279.el6.x86_64initrd-2.6.32-279.el6.x86_64kdump.img 7 mkdir /boot/grub/在/boot目录新建一个grub目录8 touch /boot/grub/grub.conf/新建一个grub.conf配置文件9 cp -rf /usr/share/grub/x86_64-redhat/* /boot/grub/
3、 的所有内容拷贝到/boot/grub中。10 设置grub参数 如果有flash CDROM这一步必须将其拔掉rootbogon boot# grubProbing 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, TABlists possible command completions.
4、Anywhere else TAB lists the possiblecompletions of a device/filename.grub root (hd0,0)root (hd0,0)Filesystem type is ext2fs, partition type 0x83grub setup (hd0)setup (hd0)Checking if /boot/grub/stage1 exists. noChecking if /grub/stage1 exists. yesChecking if /grub/stage2 exists. yesChecking if /grub
5、/e2fs_stage1_5 exists. yesRunning embed /grub/e2fs_stage1_5 (hd0). 27 sectors are embedded.succeededRunning install /grub/stage1 (hd0) (hd0)1+27 p (hd0,0)/grub/stage2 /grub/grub.conf. succeededDone.11 重启进入grub 分别输入grub root (hd0,0)root (hd0,0)Filesystem type is ext2fs, partition type 0x83grub kernel
6、 /vmlinuz-2.6.32-279.el6.x86_64 ro root=/dev/sda3 /默认系统的根分区为/dev/sda3kernel /vmlinuz-2.6.32-279.el6.x86_64 ro root=/dev/sda3 grub initrd /initramfs-2.6.32-279.el6.x86_64.imginitrd /initramfs-2.6.32-279.el6.x86_64.imggrub boot 12系统启动后重建grub.confdefault=0timeout=5splashimage=(hd0,0)/grub/splash.xpm.gzhiddenmenutitle Red Hat Enterprise Linux (2.6.32-279.el6.x86_64)root (hd0,0)kernel /vmlinuz-2.6.32-279.el6.x86_64 ro root=/dev/sda3 rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto LANG=zh_CN.UTF-8 rd_NO_LVM rd_NO_DM rhgb quietinitrd /initramfs-2.6.32-279.el6.x86_64.img