Set grub password
Through grub, the user can enter the single-user mode and change the root password, so in order to ensure the security of the system, set the password for grub.
1. Plaintext encryption
Vim / etc/grub.con
Add under hiddenmenu
Password= password
Save exit
Restart the virtual machine, press any key to enter grub, press p to enter the password
2. Encryption of ciphertext
1. Md5 encryption
First generate the ciphertext corresponding to the password
Grub-md5-crypt
After the ciphertext is generated, add it to the same location in the configuration file
Password-md5 ciphertext
2. Sha encryption
Add in the same location
Password-encrypted ciphertext
