Centos7 grub damage repair

The tester came to me and told me that the test environment could not be remotely operated, but I could ping. After logging in to the virtual machine, I found that the system had been faked dead and could not be operated, so I had no choice but to reset the virtual machine. After the reset, the virtual machine could not enter the system prompt:

Error: can't find command':'

Grub >

1. Manual boot

# failed to repair grub by manual boot! #

Grub > ls

Grub > ls (hd0,msdos1) / grub2 # # separate partition

Grub > insmod xfs

Grub > set root= (hd0,msdos1) (- > this is the boot partition you found in the previous step)

Grub > linux16 / vmlinuz-xxxxx root=/dev/sda1 # I see sda1 when boot partition through rescue mode

Grub > initrd16 / initramfs-.xxxxx.img

Grub > boot

#! Failure! #

2. Repair through rescue mode

(1) the virtual machine loads the centos7 CD-ROM drive, and the BIOS setting is started through dvd.

(2) Select Trobleshooting

(3) Select Rescue a CentOS Linux system

(4) Select 1) Continue

(5) enter the sh interface

Sh-4.2# chroot / mnt/sysimage # change to the root directory

Sh-4.2# cp-r / boot/ / tmp/ # backup boot partition files

Sh-4.2# rm-fr / boot/* # Delete all files under the boot partition

Sh-4.2# mount / dev/cdrom / media # Mount the CD-ROM drive

Sh-4.2# rpm-ivh / mnt/Packages/kernel-3.10.0-514.e17.x86_64.rpm-- force # reinstall the kernel, preferably with the previous version of the kernel

Sh-4.2# grub2-install / dev/sda1 # install grub directory

Sh-4.2# grub2-mkconfig-o / boot/grub2/grub.cfg # repair grub2 configuration file

Sh-4.2# exit

Sh-4.2# reboot

Choose: boot from the hard disk, the system can find the grub normally, find the kernel to boot normally, and the repair is complete.