Change the administrator password in single-user mode in Linux

Change the administrator password in single-user mode in Linux

Use CentOS 6.6 in Linux

1. Press e or enter to enter the GRUB Startup Menu after starting the instance, as shown in figure;

2. Press e to enter the editing mode, and move the up/down key to switch to the 2nd line of kernel;

3. Press e to enter the kernel to edit the command line. For example, enter single, s, or 1

After entering the information, press enter to save and return to the upper-level Startup menu. Press B to start the system.

4. You do not need to enter the administrator password to start the system. In single-user mode, you can run the passwd command to change the administrator password;

5. single-user mode running level

Enter 1. The running level is displayed

[Root @ yong ~] # Runlevel

1 S

The input s or single running level is displayed

[Root @ yong ~] # Runlevel

N S

In single-user mode, the network cannot be connected, which is equivalent to Windows security mode.

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