What to do with Linux forgetting the root password, and grub encryption

What about forgetting the root password with Linux? Restart the host before the physical host into single-user mode and change the password.

First, enter the single-user mode,

1. Restart the machine, press any key in the interface

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2, in the interface by E (this case to grub encryption, you need to press p after entering the password)

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3, such as the interface, move the cursor to the second option, press E

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4, such as, at the end of the input 1 or S or single, return to the return, press B to boot to enter one-user mode.

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Second, change the root password, directly passwd and enter the new password.

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Third, for the Grub encryption, prevent others from touching the physical host after easy to modify the root password.

Configure the grub plaintext password, modify the Grub file, add password lines.

[Email protected] ~]# vi/etc/grub.conf [[email protected] ~]# cat/etc/grub.conf | Grep-v ^# | Head-5 # View first 5 lines non # start file default=0timeout=5password 123456 # Add password splashimage= (hd0,0)/grub/splash.xpm.gzhiddenmenu[[em AIL protected] ~]#

Configure the Grub ciphertext password, Grub-md5-crypt first, and then modify the configuration file.

[Email protected] ~]# grub-md5-cryptpassword:retype Password: $1$ppq/9$0onwm6l.6oz7y3daujckp0 #加密后的密码 [[Email Protected] ~]# vim/etc/grub.conf [[email protected] ~]# cat/etc/grub.conf | Grep-v ^# | Head-5default=0timeout=5password--md5 $1$ppq/9$0onwm6l.6oz7y3daujckp0 #添加密文splashimage = (hd0,0)/grub/ Splash.xpm.gzhiddenmenu[[email protected] ~]#

What to do with Linux forgetting the root password, and grub encryption