GUI-based centos5.5 system root user forgot password solution

I haven't been tossing the VM on my computer for a long time. if I want to test something on the VM, I forgot the root user password. To see what the linux system looks like, I installed a virtual machine in my own book. But I am used to window interface users, so I installed a window with easy to use for the first time.

I haven't been tossing the VM on my computer for a long time. if I want to test something on the VM, I forgot the root user password.

To see what the linux system looks like, I installed a virtual machine in my own book. But I am used to window interface users, so I installed the CentOS 5.5 system with an interface for the first time.

Okay. now let's begin to introduce the solution for the root user to forget the password.

Step 1:When centos5.5 is started, press "space" on the keyboard until the system menu gnu grub appears. The interface is as follows:[There is no centos interface by default, and the system menu is invisible. In fact, the system menu is loaded. for example, press ctrl + alt + delete on windows to enter the bios setting interface]

Step 2:Go to the step 1 page and press "e" to go to the edit GRUB page [select your own based on the up and down arrow keys, similar ]. For example:

Step 3: Go to step 2. press "e" to go to the editing page, add "space" after rhgb quiet, and then type "single ", or enter "1" of the number and press enter to confirm. [This figure is not truncated, o (too many) o], press enter to confirm, and then enter the figure in step 2 grub again, but rhgb quiet, and then enter the corresponding command.

Step 4: continue to press "e" to enter the editing interface -- set the new password interface sh-3.2 # command [in, my Chinese characters are garbled]

Step 5: enter passwd root after sh-3.2 # command

Enter the password twice. if the entered password is too short, a prompt is displayed.

If the authentication is successful, for example, run the sh-3.2 # command and enter reboot to restart the system.

At this point, it is done, even if the password is forgotten, it is not afraid. [Hey, save my password: testroot]

By the way: sh-3.2 # if passwd root forgets another user name, this is also the case. For example, if another account is lhy, passwd lhy

For several records in CentOS 5.5, refer to the blog "linux Series".