Sudo prompts the user to use the solution is not in the sudoers file

CentOS sudo prompts the user to use the solution is not in the sudoers file

Method / Step

1. 1

   To root

   [linux@localhost ~]$ su root

   password:

   [root@localhost ~]#

2. 2

   Check / etc / sudoers file permissions, if the read-only access, modify writable permissions

    [root@localhost ~]# ll /etc/sudoers

   -r--r-----. 1  root root 4030 12月  10 09:55 /etc/sudoers

    [root@localhost ~]#  chmod 777 /etc/sudoers

   [root@localhost ~]# ls -l /etc/sudoers

   -rwxrwxrwx. 1 root root 4030 12月  10 09:57 /etc/sudoers

3. 3

   Modify / etc / sudoers file, execute the following command:

   / * Username is your user name * /

   [root@localhost ~]# echo 'username  ALL=(ALL)    ALL' >> /etc/sudoers  

   Visudo input or the root authority or vim / etc / sudoers, find root ALL = (ALL) ALL field, the next line is added:

   username    ALL=(ALL)     ALL

   After 5 minutes the password expires, next time you need to re-enter, so you do not want trouble, you can use the following method

   username    ALL=(ALL)     NOPASSWD: ALL

   Description: the format {username = command network host range (target user executing the command) executed}

4. 4

   Save and exit, and restore the / etc / sudoers access to 440

   [root@localhost ~]# chmod 440 /etc/sudoers

   [root@localhost ~]# ll /etc/sudoers

   -r--r-----. 1 root root 4030 12月  10 09:59 /etc/sudoers

5. 5

   切换到普通用户，测试用户权限提升功能