Linux (RedHat) change root password when booting

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When you start to see the following interface, press E to enter the editing interface

And then you see this.

Click on e again to select the second item

Select the second item and press E to enter the edit interface, enter single (remember that there is a space), and then enter, and one is the start-user mode

Return to the previous interface, follow the prompts to restart by B

Single-user mode started successfully

Enter passwd, then enter the new root password

Then enter reboot restart

Re-Login

Connect with SECURECRT, enter the new root password, the connection is successful!

Linux (RedHat) change root password when booting