What if linux forgets the root password and grub Password?

Article Title: What should I do if I forget the root password and grub Password in linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

When we forget the root password, we can

Use a single user method to change the password. We need to use a CD to change the root password.

1. Place the system disc into the optical drive and set the Boot Mode of the optical drive.

 

2. Select F2 to go to system repair. Enter the command: linux rescue.

 

3. the options below are the same as those when installing the system.

4. Remember the command: chroot/mnt/sysimage.

 

5. The next step is to change the password. We should first go to the "chroot/mnt/sysimage" mode.

 

6. Run the command passwd.
New Password
Confirm New Password
7. restart the computer.

How to encrypt grub: There are two types of grub passwords: plaintext and MD5.
Plaintext encryption: edit the grub. conf file
Vim/boor/grub. conf add a line of password = 1234567890 Under default = 0 (this is the plaintext password)

MD5 encryption: First Command grub-md5-crypt to calculate the MD5 value, and then copy this value to grub. password in the conf file -- md5 $ BYxEn $ e5X/xOTS2pTpPPWtgIMhU1 (this is the value encrypted with MD5)