xxx is not in the sudoers file.This incident will be reported.的解决方法

执行sudo yum -y update的时候

[sandwich@192 ~]$ sudo yum -y update

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

[sudo] password for sandwich: 
sandwich is not in the sudoers file.  This incident will be reported.

这时候需要给sandwich这个用户分配sudo权限，请follow以下步骤吧

[sandwich@192 ~]$ su root
Password: 

[root@192 sandwich]# chmod u+w /etc/sudoers

vi /etc/sudoers

找到这行 root ALL=(ALL) ALL,在他下面添加xxx ALL=(ALL) ALL (这里的xxx是你的用户名)
ps:这里说下你可以sudoers添加下面四行中任意一条

#允许用户yuser执行sudo命令(需要输入密码).
user            ALL=(ALL)                ALL
#允许用户组user里面的用户执行sudo命令(需要输入密码).
%user           ALL=(ALL)                ALL
#允许用户user执行sudo命令,并且在执行的时候不输入密码.
user            ALL=(ALL)                NOPASSWD: ALL
#允许用户组youuser里面的用户执行sudo命令,并且在执行的时候不输入密码.
%user           ALL=(ALL)                NOPASSWD: ALL

[root@192 sandwich]# chmod u-w /etc/sudoers

这样新用户就可以使用sudo了。