Install TightVNC Server in RHEL/CentOS and Fedora to Access Remote Desktops

Virtual Networking Computing (VNC) is a Kind of remote sharing system that makes it possible to take control of any other computer connected to internet. Keyboard and mouse clicks can easily transmit from one computer to another. It helps administrator and technical staff to manage their servers and desktops without being to the same location physically.

VNC is an open source application created in late 1990’s. It is independent and is compatible with Windows and Unix/Linux. Means a normal Windows based user can interact with Linux based system without any hazel.

To use VNC you must have TCP/IP connection and VNC viewer client to connect to a computer running VNC server component. The server transmits a duplicate display of a remote computer to the viewer.

This artilce demonstrates how to install VNC Server using TightVNC a much enhanced version of a older VNC program, with GNOME Desktop remote access on RHEL, CentOS and Fedora systems.

Step 1: Installing GNOME Desktop

If you’ve installed a minimal version of Operating System, which gives only a command-line interface not GUI. Then you need to install a GUI (Graphical User Interface) with GNOME Desktop. The GNOME desktop provides a lightweight desktop environment that works very well on remote VNC desktops.

[[email protected] ~]# yum groupinstall "X Window System" "Desktop"

Step 2: Installing TightVNC Server

TightVNC a remote desktop control software that enables us to connect to remote desktops. To install, use the following yum command as shown below.

[[email protected] ~]# yum -y install tigervnc-server xorg-x11-fonts-Type1

Step 3: Create a Normal VNC User

Create a normal user, that will be used to connect to remote desktop. For example, I’ve used “tecmint” as a user, you can choose your own username.

[[email protected] ~]# useradd tecmint
[[email protected] ~]# passwd tecmint
Changing password for user tecmint. 
New password: 
Retype new password: 
passwd: all authentication tokens updated successfully.

Step 4: Set VNC Password for User

Create a new password for newly created user. Login to the user (su – tecmint) and run ‘vncpasswd‘ to set the VNC password for the user.

Note : This password is for accessing VNC remote desktop, and the password we created in step 3 is for accessing SSH.

[[email protected] ~]# su - tecmint
[[email protected] ~]$ vncpasswd
Password:
Verify:

The above command ask you to supply password twice and creates “.vnc” directory under user’s home directory with passwd file inside it. You can check the password file is created, by using following command.

# ls -l /home/tecmint/.vnc
-rw------- 1 tecmint tecmint 8 Jul 14 21:33 passwd

Now exit from user login and return to root user login.

[[email protected] ~]$ exit
exit

Step 5: Create VNC Xstartup Script

Create the xstartup script as root user. This can be created by starting the VNC server.

[[email protected] ~]# /etc/init.d/vncserver start

Starting VNC server: 1:tecmint 
New 'tecmint.com:1 (tecmint)' desktop is tecmint.com:1

Starting applications specified in /home/tecmint/.vnc/xstartup
Log file is /home/tecmint/.vnc/tecmint.com:1.log
						 [  OK  ]

Next, check whether xstartup script is created under (tecmint) user’s home directory, do “ls -l” command.

[[email protected] ~]# ls -l /home/tecmint/.vnc/
-rw-------. 1 tecmint tecmint    8 Jul 15 12:27 passwd
-rwxr-xr-x. 1 tecmint tecmint  654 Oct 11  2012 xstartup

Once, it created,  set a desktop resolution in xstartup file. For this, you must stop running VNC service.

[[email protected] ~]# /etc/init.d/vncserver stop

Shutting down VNC server: 1:tecmint              [  OK  ]

Step 6: Setting Xstarup Resolution

Open file “/etc/sysconfig/vncservers” file your choice of editor. Here I’m using “nano” editor.  Create new VNC Session for “tecmint” with below command. where “-geomerty” is used define desktop resolution.

[[email protected] ~]# nano /etc/sysconfig/vncservers

And add following lines to it at the bottom of file. Save and close it.

## Single User ##
VNCSERVERS="1:tecmint"
VNCSERVERARGS[1]="-geometry 1280x1024"

If you’re dealing with multiple users, first create a vncpasswd for all user’s as described above in step 4, and then add those user’s to the VNCSERVERS line and add a VNCSERVERARGS[x] entry as shown below. Where ‘x‘ is the ID number.

## Multiple Users ##
VNCSERVERS="2:ravi 3:navin 4:avishek"
VNCSERVERARGS[2]="-geometry 1280x1024"
VNCSERVERARGS[3]="-geometry 1280x1024"
VNCSERVERARGS[4]="-geometry 1280x1024"

Step 7: Starting TightVNC Server

After making all changes, run the following command to start again the VNC server. Before starting VNC session to “tecmint” user, let me give you a small intro about Port Numbers and ID‘s. By Default VNC runs on Port 5900 and ID:0 (which is for root user). In our scenario I’ve created tecmint, ravi, navin and avishek. So, the ports and id’s are used by these users as follows

User's		Port's		ID's
5900		root		:0
5901		tecmint		:1
5902		ravi		:2
5903		navin		:3
5904		avishek		:4

So, here user “tecmint” will get port 5901 and id as :1 and so on. If you’ve created another user say (user5) then he will get port 5905 and id:5 and so on for each user you creates.

[[email protected] ~]# /etc/init.d/vncserver start

Starting VNC server: 1:tecmint 
New 'tecmint.com:1 (tecmint)' desktop is tecmint.com:1

Starting applications specified in /home/tecmint/.vnc/xstartup
Log file is /home/tecmint/.vnc/tecmint.com:1.log

2:ravi 
New 'tecmint.com:2 (ravi)' desktop is tecmint.com:2

Starting applications specified in /home/ravi/.vnc/xstartup
Log file is /home/ravi/.vnc/tecmint.com:2.log

3:navin 
New 'tecmint.com:3 (navin)' desktop is tecmint.com:3

Starting applications specified in /home/navin/.vnc/xstartup
Log file is /home/navin/.vnc/tecmint.com:3.log

4:avishek 
New 'tecmint.com:4 (avishek)' desktop is tecmint.com:4

Starting applications specified in /home/avishek/.vnc/xstartup
Log file is /home/avishek/.vnc/tecmint.com:4.log

                                                           [  OK  ]

Step 8: Open VNC Ports on Firewall

Open port on iptables, say for user (tecmint) at 5901.

[[email protected] ~]# iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 5901 -j ACCEPT

For multiple users, ravi, navin and avishek. I open ports 5902, 5903 and 5904 respectively.

[[email protected] ~]# iptables -I INPUT 5 -m state --state NEW -m tcp -p tcp -m multiport --dports 5902:5904 -j ACCEPT

Restart Iptables service.

[[email protected] ~]# service iptables save
[[email protected] ~]# service iptables restart

Step 9: Download VNC Client

Now go to your Windows or Linux machine and download VNC Viewer client and install in your system to access the desktop.

  1. Download VNC Viewer

Step 10: Connect to Remote Desktop Using Client

After you installed the VNC Viewer client, open it you’ll get similar to below screen. Enter VNC Server IP address along with VNC ID (i.e 1) for user tecmint.

VNC Server Login Details
Enter VNC Server IP Address

Enter password that we created with “vncpasswd” command.

Enter VNC User Password
Enter VNC User Password

That’s it, you connected to your Remote Desktop.

VNC Remote Desktop
VNC Remote Desktop

Read Also : Access VNC Desktop from Web Browser

Reference Link

TightVNC Homepage

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42 thoughts on “Install TightVNC Server in RHEL/CentOS and Fedora to Access Remote Desktops”

  1. Hello,

    This is not really TightVNC but TigerVNC. I wanted TightVNC to be able to only share one application and not the whole desktop.
    Do you know how to do it with TigerVNC ?

    Kindly

    Reply
    • @Antechno,
      Are you taken written permission from us before creating videos from our articles? this is against our copyright violation..I request you to remove article either give proper credit to original article..

      Reply
  2. hi i did all steps and try start the service get this error
    /etc/init.d/vncserver start
    plymouth: ply-event-loop.c:493: ply_event_loop_new: Assertion `loop->epoll_fd >=
    0′ failed.
    /etc/init.d/functions: line 543: 28173 Aborted /bin/plymouth –d
    etails

    system: centos6.4

    please help sending me crazy

    Reply
  3. hi

    my problem is in step 5
    when i try to open commend : /etc/init.d/vncserver start

    this error showing :

    Starting VNC server: no displays configured [FAILED]

    on centos-6-x86

    Reply
  4. Oh Boy ! ***************************************************************

    Close but no cigar…

    @ Ravi

    1st, at the end of step 5, you write:
    “Once, it created, set a desktop resolution in xstartup file. For this, you must stop running VNC service.”

    The at the beginning of step 6 you go:
    Open file “/etc/sysconfig/vncservers” file your choice of editor. Here I’m using “nano” editor. Create new VNC Session for “tecmint” with below command. where “-geomerty” is used define desktop resolution.

    ??? Ambiguous file references ???

    In xstartup in the user’s home directory or in /etc/sysconfig/vncservers do we add the Resolution setting code ?

    2nd, This is ok for sysint and iptables. If, like the gentlemen named Matheis, as of the date of publication of this article, one would be using an advance distribution like Fedora 18, out Jan 15 2013 this article is already old school.

    With systemd and firewalld, most of this nice try does not work.

    MotherDawg
    Aka: NetWeezurd

    Reply
    • Hey my fedora too required me to tweak around the systemd. Could you create a page with how to set up vnc with config files under systemd

      Reply
  5. I have installed VNC as per above tutorial

    now Vnc viewer is asking for session password after keeping the server in idel conditins for some time..when i entered the login password its not working

    kindly suggest what can be done

    Reply

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