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Customer Content Services. David. OBrien. Red Hat. Customer Content Services. Michael. Hideo. Red Hat. Customer Content Services. Don. Domingo. Red Hat. Customer Content Services. John. Ha. Red Hat. Customer Content Services. Chapter 1. 2.  Tiger. VNC Red Hat Customer Portal. Tiger. VNC Tiger Virtual Network Computing is a system for graphical desktop sharing which allows you to remotely control other computers. Tiger. VNC works on the client server principle a server shares its output vncserver and a client vncviewer connects to the server. VNC Virtual Network Computing desktop. It runs Xvnc with appropriate options and starts a window manager on the VNC desktop. Installing VNC Server. To install the Tiger. VNC server, issue the following command as root. Configuring VNC Server. The VNC server can be configured to start a display for one or more users, provided that accounts for the users exist on the system, with optional parameters such as for display settings, network address and port, and security settings. Procedure 1. 2. 1. Configuring a VNC Display for a Single User. A configuration file named etcsystemdsystemvncserver. To create this file, copy the usrlibsystemdsystemvncserver. There is no need to include the display number in the file name because systemd automatically creates the appropriately named instance in memory on demand, replacing i in the service file by the display number. For a single user it is not necessary to rename the file. For multiple users, a uniquely named service file for each user is required, for example, by adding the user name to the file name in some way. See Section 1. 2. Configuring VNC Server for Two Users for details. Edit etcsystemdsystemvncserver. USER with the actual user name. Leave the remaining lines of the file unmodified. The geometry argument specifies the size of the VNC desktop to be created by default, it is set to 1. Exec. Startusrsbinrunuser l USER c usrbinvncserver i geometry 1. PIDFilehomeUSER. Hi. Save the changes. To make the changes take effect immediately, issue the following command. Set the password for the user or users defined in the configuration file. Note that you need to switch from root to USER first. USER vncpasswd. The stored password is not encrypted anyone who has access to the password file can find the plain text password. Configuring VNC Server for Two Users. If you want to configure more than one user on the same machine, create different template type service files, one for each user. Create two service files, for example vncserver USER1. USER2. service. In both these files substitute USER with the correct user name. Set passwords for both users. USER1 vncpasswd. USER2 vncpasswd. Starting VNC Server. To start or enable the service, specify the display number directly in the command. The file configured above in Procedure 1. Configuring a VNC Display for a Single User works as a template, in which i is substituted with the display number by systemd. With a valid display number, execute the following command. You can also enable the service to start automatically at system start. Then, when you log in, vncserver is automatically started. As root, issue a command as follows. At this point, other users are able to use a VNC viewer program to connect to the VNC server using the display number and password defined. Provided a graphical desktop is installed, an instance of that desktop will be displayed. It will not be the same instance as that currently displayed on the target machine. Configuring VNC Server for Two Users and Two Different Displays. For the two configured VNC servers, vncserver USER1. USER2. service, you can enable different display numbers. For example, the following commands will cause a VNC server for USER1 to start on display 3, and a VNC server for USER2 to start on display 5. USER1 3. service systemctl start vncserver USER2 5. VNC setup based on xinetd with XDMCP for GDM. VNC setup based on xinetd with X Display Manager Control Protocol XDMCP for GDM is a useful setup for client systems that consist mainly of thin clients. After the setup, clients are able to access the GDM login window and log in to any system account. The prerequisite for the setup is that the gdm, vnc, vnc server and xinetd packages are installed. Service xinetd must be enabled. System default target unit should be graphical. To get the currently set default target unit, use. The default target unit can be changed by using. Procedure 1. 2. 2. Accessing the GDM login window and logging in. Set up GDM to enable XDMCP by editing the etcgdmcustom. Create a file called etcxinetd. Xvnc. serverargs inetd query localhost once geometry selectedgeometry depth selecteddepth securitytypesnone. In the serverargs section, the query localhost option will make each Xvnc instance query localhost for an xdmcp session. The depth option specifies the pixel depth in bits of the VNC desktop to be created. Acceptable values are 8, 1. Edit file etcservices to have the service defined. To do this, append the following snippet to the etcservices file. VNC xinetd GDM base. To ensure that the configuration changes take effect, reboot the machine. Alternatively, you can run the following. Change init levels to 3 and back to 5 to force gdm to reload. Verify that gdm is listening on UDP port 1. Restart the xinetd service. Verify that the xinetd service has loaded the new services. LISTEN 3. 11. 9xinetd. Test the setup using a vncviewer command. The command will launch a VNC session to the localhost where no password is asked. You will see a GDM login screen, and you will be able to log in to any user account on the system with a valid user name and password. Then you can run the same test on remote connections. Configure firewall for the setup. Run the firewall configuration tool and add TCP port 5. Terminating a VNC Session. Similarly to enabling the vncserver service, you can disable the automatic start of the service at system start. Or, when your system is running, you can stop the service by issuing the following command as root.