How to quickly modify the root password under CentOS8

Start the centos8 virtual machine and press the up and down keys to select the first line in the interface in Figure 1

As shown in Figure 1

Press the 'e' key to enter the interface shown in Figure 2, and move the down arrow key to the line that begins with "linux16". Then press the right arrow key to move, find "ro" and change it to " rw init=/sysroot/bin/bash ". (There is a space after rw, and \ is added by the system itself), as shown in Figure 3.

As shown in Figure 2

As shown in Figure 3

Press and hold the Ctrl and x keys at the same time, and the system will enter the following interface, which is the emergency mode. As shown in Figures 4 and 5.

As shown in Figure 4, the waiting time for this interface is relatively long, so you need to wait patiently.

As shown in Figure 5

4. Run the command " chroot /sysroot/ " to switch back to the original system (i.e. centos7), and then you can change the password. After changing the password, run the command " touch /.autorelabel " to make SELinux take effect and the password take effect. As shown below. (If the following garbled characters appear (vmware does not support Chinese characters, so squares are displayed), temporarily set the current terminal language to English). As shown in Figure 6.

/# chroot /sysroot/
	/# LANG=en (Change the language to English)
	/#passwd
	/# touch /.autorelabel 

As shown in Figure 6
5. Press and hold the "Ctrl+d" keys at the same time, enter "reboot", and press the Enter key to restart the system. As shown in Figure 7.

As shown in Figure 7

6. Enter this interface and enter the newly set root password to log in successfully. As shown in Figure 8.

As shown in Figure 8

7. Login successful and enter the centos8 system. As shown in Figure 9.

As shown in Figure 9

At this point, the root password of the centos8 system has been modified!

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