Restore the /boot directory after corruption or missing files

• Enable the network so yum can function.
• Mount /boot from your disk.

#mount /dev/sda1 /boot

• Make a directory grub2 on /boot as follows.

#mkdir /boot/grub2

• Copy the modules as or copy the entire things from an identical system as fonts locale directive.

#cp -r /usr/lib/grub/i386-pc /boot/grub2/i386-pc

• Reinstall the kernel packages

# yum remove kernel-<release>
# yum install kernel-<release>

It is anticipated to have grubby fatal error: unable to find a suitable template, which can be ignored at this time because /boot does not yet have /boot/grub2/grub.cfg.

• Install the grub2 package as follows.

#yum reinstall $(rpm -qa | grep grub)

• Recreate the grub configuration as follows.

#grub2-mkconfig -o /boot/grub2/grub.cfg

• Check if /etc/grub2.cfg has a symbolic link to /boot/grub2/grub.cfg
• Finally, reinstall the grub on new created partition as follows.

#grub2-install <disk>
Ex:
#grub2-install /dev/sda

This should be sufficient to create the /boot directory and boot the system, but if you have a backup of /boot, you should restore it from the backup.