Local User ROOT privileges (sudo) Linux 7

open the file and command below :- 

#visudo

If you want to give the some permission to user with out password in  restart, start and stop
the services in linux 7 version put the below in last visudo file
bhandari    ALL = NOPASSWD: /bin/systemctl, /etc/init.d/network

If you want to root privileges to local user with out password below the command 
bhandari        ALL=(ALL)       NOPASSWD: ALL
If you want to root privileges with sudo and password 
bhandari        ALL=(ALL)        ALL