to boot your system with a live-cd like systemrescuecd.
mkdir /mnt/temp
mount /dev/xvda2 /mnt/temp/
mount: unknown filesystem type 'LVM2_member'
yum install lvm2
modprobe dm-mod
vgscan
vgchange -ay VolGroup00
fdisk -l
mount /dev/VolGroup00/LogVol00 /mnt/temp/
mount /dev/xvda1 /mnt/temp/boot
mount --bind /proc /mnt/temp/proc
mount --bind /sys /mnt/temp/sys
mount --bind /dev /mnt/temp/dev
chroot /mnt/temp /bin/bash
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install /dev/sda
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