How to solve the problem when ‘sudo’ doesn’t work

1. problem

$ sudo not work

$ sudo yum install ~~~~
...is not in the sudoers file. This incident will be reported.

2. solution

register user into /etc/sudoers
<pre> $ su - $ chmod u+w /etc/sudoers $ vi /etc/sudoers </pre>

[/etc/sudoers 하단에 다음을 추가]

'USER_NAME' ALL=(ALL) ALL

$ chmod u-w /etc/sudoers

done!!