The user in CentOS is not in the sudoers file. The matter will be reported.

First switch to root user su root;

Then change the etc/sudoers file to read-only as a readable writable executable.

sudo chmod 777/etc/sudoers

Enter the visudo command to edit the file and find the root all= (all) field

Append username all= (All)all, where username is the user name you currently need to get root privileges

After 5 minutes the password expires, next time you need to re-enter, if you do not want to be so troublesome, you can use the following methods

Username all= (All) Nopasswd:all

Save exit and restore/etc/sudoers access to 440

chmod 440/etc/sudoers

Switch to normal user, test user privilege elevation function

The user in CentOS is not in the sudoers file. The matter will be reported.