Reinstall Grub 2 - CentOS

Note: This guide is from inside a running OS, not for recovering a broken OS.

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/sec-Reinstalling_GRUB_2.html

UEFI:

sudo rm /etc/grub.d/* -R
sudo rm /etc/sysconfig/grub
yum reinstall -y grub2-efi shim grub2-tools
grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg

MBR/BIOS:

sudo rm /boot/grub2/grub.cfg
sudo rm /etc/grub.d/* -R
sudo rm /etc/sysconfig/grub
yum reinstall -y grub2-tools
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install /dev/sda

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Reinstall Grub 2 - CentOS