* install vnc-server (tigervnc-server on cenOS 6.8.)

```bash
[root@apaternina nfs]# yum install vnc-server
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: centos.uniminuto.edu
 * extras: centos.uniminuto.edu
 * updates: centos.uniminuto.edu
Package tigervnc-server-1.1.0-18.el6.x86_64 already installed and latest version
Nothing to do
```

* install vnc client

```bash
[root@apaternina nfs]# yum install vnc
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: centos.uniminuto.edu
 * extras: centos.uniminuto.edu
 * updates: centos.uniminuto.edu
Package tigervnc-1.1.0-18.el6.x86_64 already installed and latest version
Nothing to do
```

* Create the VNC users accounts

```bash
$ su -
# useradd vnc-user
```

* Edit the server configuration.

```bash
vi /etc/sysconfig/vncservers 

VNCSERVERS="1:vnc-user"
VNCSERVERARGS[1]="-geometry 640x480"
```

* Set your users' VNC passwords.

```bash
[root@apaternina nfs]# su vnc-user
[vnc-user@apaternina nfs]$ vncpasswd
Password:
Verify:
[vnc-user@apaternina nfs]$ cd /home/vnc-user/.vnc/
[vnc-user@apaternina .vnc]$ ls
passwd
[vnc-user@apaternina .vnc]$ exit
exit
[root@apaternina nfs]# 
```

* Confirm that the vncserver will start and stop cleanly.
* Create and customize xstartup scripts.
* Amend the iptables.
* Start the VNC service.
* Test each VNC user.
* Additional optional enhancements