Usually, to grant sudo access you add the user to the sudo group defined in the sudoers. On Debian, Ubuntu and their derivatives, members of the group `sudo` are granted with sudo privileges while on RedHat based distributions like CentOS and Fedora, the name of the sudo group is `wheel`. This tutorial explains how to configure the sudoers file and allow certain users to run sudo commands without being asked for the password.

Source: LXer – How to Run Sudo Command Without Password