+function _add_user_to_visudo()
+{
+# Allow admin users to access without password
+if ! grep -q "#openmano" /etc/sudoers
+then
+ cat >> /home/${option_user}/script_visudo.sh << EOL
+#!/bin/bash
+echo "#openmano allow to group admin to grant root privileges without password" >> \$1
+echo "${option_user} ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+EOL
+ chmod +x /home/${option_user}/script_visudo.sh
+ echo "allowing admin user to get root privileges withut password"
+ export EDITOR=/home/${option_user}/script_visudo.sh && sudo -E visudo
+ rm -f /home/${option_user}/script_visudo.sh
+fi
+
+}