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Configuring The TigerVNC Server In Fedora 21/RHEL7/CentOS7

Introduction: 
TigerVNC (Tiger Virtual Network Computing) is a system for graphical desktop sharing which allows you to remotely control other computers. TigerVNC works on the client-server network. A server shares its output (vncserver) and a client (vncviewer) connects to the server. 



1. Installing VNC Server

~]# yum install tigervnc-server

Now we need to copy the configure the configuration file as following:

~]# cp /lib/systemd/system/vncserver@.service /etc/systemd/system/vncserver@.service

Now need to edit the file, and here we can mention the name of the user which we want to allow for desktop sharing:

~]# vim /etc/systemd/system/vncserver@.service

replace USER with the actual user name. Leave the remaining lines of the file unmodified.

Following is the actual line in the file:
ExecStart=/sbin/runuser -l USER -c "/usr/bin/vncserver %i -geometry 1280x1024"
PIDFile=/home/USER/.vnc/%H%i.pid

Here we need to write Username instead of USER, EX: if my username is vchauhan then line would we like that:
ExecStart=/sbin/runuser -l vchauhan -c "/usr/bin/vncserver %i -geometry 1280x1024"

3. save the changes and exit from file.

4. To make the changes take effect immediately, issue the following command:

~]# systemctl daemon-reload


5. Set the password for the user or users defined in the configuration file. Note that you need to switch from root to USER first.

~]# su – vchauhan
~]$ vncpasswd
Password:
Verify:



Configuring VNC Server for Two Users

1. First of all need to set the password for the users which we are going to add into vnc

~]$ su - suresh
~]$ vncpasswd
Password:
Verify:

~]$ su - sonu
~]$ vncpasswd
Password:
Verify:

2. Now need to start the VNC server daemon again:

~]# systemctl start vncserver@:1.service

Note: Here “1” is the display number, we can type any number, after daemon reload a port number will be start from the server, in my example, port number would be: 5901.
we can verify it:

~]# netstat -tupnl | grep 5901

Now we can access the server by using this port using any given user name:

~]# vncviewer localhost:5901


Configuring VNC Server for two users and two different displays

Now if we want to specify the different port number for each user, so every user can have it's own desktop at the same time, we need to specify the port number for them according to following. 

Those commands will start a VNC server for suresh user to start on display 3, and a VNC server for sonu user to start on display 4:


~]# systemctl start vncserver-suresh@:3.service
~]# systemctl start vncserver-sonu@:4.service

Terminating a VNC session

We can disable the service for particular display or user:

~]# systemctl disable vncserver@:display_number.service


For the run time only we can disable the service also:


~]# systemctl stop vncserver@:display_number.service



Done........

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