Fixed CentOS 6.4 Grub startup

Cause and solution: it may be grub. the configuration of the conf file is incorrect, or the files under/boot/grub and/boot are lost. First, judge whether the system tries to start the file manually. Maybe the files are still running and can be started, check grub. incorrect conf

Step 1

Grub> root (hd0, 0)

### If you do not know whether boot is installed in the first partition, use find/grub. conf to check whether cat (hd0, 1)/etc/fstab can find the UUID of/partition.

Step 2

Grub> kernel/vmlinuz-xxxxx ro root =/dev/sda2

### Use kernel space or press the TAB key to output the file. You can use root = UUID = xxxx for the subsequent root partition.

Step 3

Grub> initrd/intfsram -- xxx

### Version 6.4 has been renamed

Step 4

Grub> boot

Step 5

### Modify the grub. conf file and save it for the next normal start #3

### Edit grub. conf ###

Default = 0

Timeout = 5

Titile = RedHat

Root (hd0, 0)

Kernel \ xxxxx ro root = xxxxx

Initrd \

### If all files under/boot/are lost, the resuce mode is required ###

Chroot/mnt/sysimage

Mount/dev/cdrom/mnt

Cd/mnt/Packets

Rpm-ivh kernel-xxxx -- force

### Be sure to add the vmlinuz files under/boot/after force is installed ###

After the experiment is restored, it will take some time for The selinux tag to be automatically restored by the system. Later, The selinux tag needs to be restarted.