centos7配置
1.生成密碼
root:~ # grub2-mkpasswd-pbkdf2
2.編輯文件
root:~ # vim /etc/grub.d/00_header
cat <<EOF
set superusers='root'
password_pbkdf2 root grub.pbkdf2.sha512.10000.B26A27BDB528B6B5C06979B5E0EFD8B9B436D96629C78B062A2B161945BE38965118BB13D2D88C09FFC415DDE73BBD294795F00F08279957DA0132978E0A69D0.8A506D6B41740DEB74A1C618D0E34BC1DBC0578800C40599670D81BF13DA3DC5D0427C21325BAAEC73A12789A096BD077A06B918F5A74C420A4B291CFD059E76
EOF
3.更新grub信息
root:~ # grub2-mkconfig -o /boot/grub2/grub.cfg
測試(顯示引導時按e進入輸入密碼模式)成功
centos6配置
獲取密文密碼
# grub-md5-crypt
編輯文件(在title行上面加入password --md5)
vim /boot/grub/grub.conf
password --md5