It happens sometime that you can't remember root password. On Linux,
recovering root password can be done by booting Linux under a specific
mode: single user mode.
This tutorial will show how to boot Linux in single user mode when using GRUB and finally how to change root password.
During normal usage, a Linux OS runs under runlevels between 3 and 5 which correspond to various multi-user modes. Booting Linux under runlevel 1 will allow one to enter into a specific mode, single user mode. Under such a level, you directly get a root prompt. From there, changing root password is a piece of cake.
01. Start your PC at the boot loader press the space bar before 5 seconds
02. Press “p” and enter the boot loader password
03. Press “a” to modify the kernel arguments before booting
04. At the end of the line add the word single or 1
05. It will be logged on as root user
06. Change the root password (As root, changing password does not ask for your old password, therefore running the command :)
This tutorial will show how to boot Linux in single user mode when using GRUB and finally how to change root password.
During normal usage, a Linux OS runs under runlevels between 3 and 5 which correspond to various multi-user modes. Booting Linux under runlevel 1 will allow one to enter into a specific mode, single user mode. Under such a level, you directly get a root prompt. From there, changing root password is a piece of cake.
01. Start your PC at the boot loader press the space bar before 5 seconds
02. Press “p” and enter the boot loader password
03. Press “a” to modify the kernel arguments before booting
04. At the end of the line add the word single or 1
grub append> ro root=/dev/lvm/logvol01 rhgb quiet 1
05. It will be logged on as root user
06. Change the root password (As root, changing password does not ask for your old password, therefore running the command :)
[root@daddylinux~]#passwd
At least with CentOS, starting on step 02, we presed "e", selected our volume, added "1" to the command, and then pressed "b" to boot.
ReplyDeleteverry good. but i have problems. I want to disable Recover root password funtions. are you idia about file config disable recovery root password ???
ReplyDelete