VNC Server

Server Side

# yum install tigervnc-server
# vncpasswd --> This is done by the user you want to access with
# vim /etc/sysconfig/vncservers --> Add the following line

VNCSERVERS="1:root"

Note:- If you want to add multiple users you can do it as follow
VNCSERVERS="1:user1 2:user2 3:user3"
OR you can do each user in one line as follow
VNCSERVERS="1:user1"
VNCSERVERS="2:user2"
VNCSERVERS="3:user3"

# /etc/init.d/vncserver start

Client Side

# yum install vncviewer
# vncviewer VNCserverIP:1 --> For user1
OR
# vncviewer VNCserverIP:2 --> For user2 ... etc

For Further Options of vncviewer Command You Can Consult Man Pages

# man vncviewer