Error xxx is not in the sudoers file. This incident will be reported solution in Centos

Introduction - Explanation of the cause of the error

xxx is not in the sudoers file. This incident will be reported "The solution
is the problem of not obtaining the highest authority . Sometimes it is not possible to solve the problem by adding sudo. Different versions of different systems have different methods of obtaining the highest authority.

Method 1: Permanently obtain the highest authority

Step 1 : Switch to the root user to log in to the system

Be sure to switch to root user login

Step 2: Open the command line and enter the following

chmod u+w /etc/sudoers

The purpose of this step is that the /etc/sudoers file is read-only by default , and it is also for root, so you need to add the write permission of the sudoers file first

Step 3: Enter vim /etc/sudoers

vim /etc/sudoers

As shown in the figure below, find line 91 , enter xxx ALL=(ALL) ALL under it, xxx is which user you want to obtain the highest authority, my ordinary user is localhost

After editing, press the Esc key and enter: wq to save and exit,
then reboot to restart ok

Tips: Let me talk about the meaning of the statement just entered on line 92:
you can sudoers add any of the following four lines
youuser ALL=(ALL) ALL
%youuser ALL=(ALL) ALL
youuser ALL=(ALL) NOPASSWD: ALL
% youuser ALL=(ALL) NOPASSWD: ALL

The first line: allow the user youuser to execute the sudo command (password required). The
second line: allow users in the user group youuser to execute the sudo command (need to enter the password). The
third line: allow the user youuser to execute the sudo command, and execute Do not enter the password.
The fourth line: Allow users in the user group youuser to execute the sudo command, and do not enter the password when executing.

Method 2: How to log in remotely as root

Step 1:
Still using root to log in to the system, open the command line and enter the following

 vi /etc/ssh/sshd_config

As shown below:

Step 2:
Find #PermitRootLogin yes, remove the # in front, that is, uncomment

After editing, press the Esc key and enter: wq to save and exit,
then reboot to restart ok

Method 3: Let ordinary users belong to the wheel group, and the wheel group can obtain the highest authority

Step 1:
Log in to the system with root, open the command line, and enter vim /etc/sudoers

vim /etc/sudoers

Step two:

find #%wheel ALL=(ALL)

# %wheel   ALL=(ALL)    NOPASSWD:ALL

remove the leading #

%wheel   ALL=(ALL)    NOPASSWD:ALL

After editing, press the Esc key and enter: wq to save and exit,
then reboot to restart ok