Linux forgot password solution

Many friends often forget the root password of the Linux system. What should I do if the Linux system forgets the root password? Reinstall the system? Of course not! Enter single user mode and change the root password.

Proceed as follows:

Restart the linux system

 

Press Enter in 3 seconds, the following interface appears.

Then enter e

Enter single at the end of the second line, with a space. The specific method is to move to the second line by pressing the downward tip, press "e" to enter the editing mode.

Add single back to the back

Finally, press "b" to start, and then enter the single-user mode.

Now that you have entered single-user mode, you can change the root password. The password more command is passwd

[ Rescue mode using the system installation CD ]

The rescue mode is rescue, which is mainly used when the system cannot enter. For example, grub is corrupted or a configuration file modification error occurs. How to use rescue mode?

CD boot, press F5 to enter rescue mode

Enter linux rescue Enter

Choose a language, I suggest you choose English

 

Select us keyboard

Here you are asked if you want to start the network, sometimes it may be debugged online. We choose no

Tell us here that the system will be mounted in /mnt/sysimage.

There are three options:

• Continue is to continue the next step after mounting. 
• Read-Only is mounted as read-only, which is more secure. Sometimes the read-only mode prevents further damage to the file system when the file system is corrupted.
• Skip is not mounted and enters a command window mode. 

Here we choose Continue.

At this point, the system has been mounted to /mnt/sysimage. Next press Enter and enter chroot /mnt/sysimage to enter the administrator environment.

Tip:  In fact, you can also change the root password in the rescue mode. This rescue mode is very similar to the windows PE system.

When chroot /mnt/sysimage/ is run, ls sees that the directory structure is the same as the directory structure in the original system.

That's right! The current environment is exactly the same as the original system environment. You can exit this environment by typing exit or pressing Ctrl + D. Then you ls look

This directory is actually the directory structure in the rescue mode, and our system files are all in the /mnt/sysimage directory.