Retrieve Centos root User Permissions

Retrieve Centos root User Permissions

The last time I encountered this problem, my friend encountered this problem again today, I recorded it by the way:
The last time we encountered a problem on our server, the linux root User was lost. At that time, I found an article on the Internet and restored it. Today I will summarize it again:
Restart the server and enter the single-user mode. If the entire root user is lost, re-create the root user. The command is as follows:

Useradd-u 0-g 0-d/root-s/bin/bash root

Create root
-U 0-g 0 specify the root uid gid as 0
-D/root: Specify the root directory as/root.
-S/bin/bash specifies the root bash
Passwd root
Reset Password
Restart