|Availability||bwUniCluster_2 | BwForCluster_JUSTUS_2|
TigerVNC is a high-performance implementation of Virtual Network Computing (VNC). VNC is a client/server application that allows users to launch and interact with graphical applications on remote machines. It is usually faster than standard X11 forwarding and thus should be used if a graphical software feels slow and has bad responsiveness.
TigerVNC is available on selected bwHPC-Clusters. A complete list of versions currently installed on the bwHPC-Clusters can be obtained from the Cluster Information System (CIS).
3 VNC Server
First, you have to start the VNC Server on the cluster. The startup procedure depends on the cluster and hardware you are using.
- VNC Server - bwUniCluster 2.0
- VNC Server - bwForCluster Chemistry
- VNC Server - bwForCluster Chemistry - 3D Acceleration
4 VNC Client
The startup script of the VNC Server should have printed out detailed instructions about how to establish a connection to the VNC Server from your local computer. These instructions depend on the operating system (e.g., Linux/macOS, MS Windows) you are using and if you work with TurboVNC Java Viewer which is a tool that can simplify the handling but needs the Java Development Kit (JDK) to run. Therefore, the next steps are divided into three cases. The commands should be executed on the local computer.
- Login using TurboVNC Java Viewer
Needed software: TurboVNC, JDK
Open TurboVNC Java Viewer. Go to Options... -> Security -> Gateway and fill in the parameters provided by the run_vncserver script. You can save these settings in the "Global" tab if you want to. Now you can click "OK", supply the VNC server and connect to the server. You should be prompted for your ssh password and your VNC password and after that the connection is established.
- Login using TightVNC Java Viewer
Needed software: TightVNC
Start the TightVNC Viewer: On Linux, open a terminal and execute the following command:
$ java -jar tightvnc-jviewer.jar. On Windows, just double-click tightvnc-jviewer.jar in the Windows Explorer.
Fill in the parameters given to you by the run_vncserver script (see example below) and press connect to establish a VNC session.
- Login without TurboVNC Java Viewer for Linux users
Needed software: A VNC Client such as TurboVNC
A SSH tunnel must be created with the command given to you by the run_vncserver script, e.g.:
$ ssh -fCL 5903:localhost:5903 firstname.lastname@example.org
Start your VNC Client and connect to localhost:n, where n is the display number, using the command given to you by the run_vncserver script. E.g.:
$ vncviewer localhost:3
- Login without TurboVNC Java Viewer for Windows users
Needed software: TigerVNC, Putty
Start Putty and navigate to Connection -> SSH -> Tunnels to fill in the parameters provided by the run_vncserver script. Subsequently, clicked "Add" and navigate to Session to connect with the cluster using your username and password. Once the connection is established, start the TigerVNC Client and connect to localhost:n, where n is the display number provided by run_vncserver.
To exit your VNC session it is not sufficient to only close the window of the viewer, because this will not terminate the VNC server. The server will keep running and you will run into problems
when you try to start a new VNC session later on. Please use the "log out" function of the desktop environment inside the VNC session, this will terminate the server properly.
6 OpenGL applications within VNC sessions
Executing an OpenGL program in a 3D accelerated VNC session will issue an error message. In order to fix this issue and redirect OpenGL commands to the graphics card on the cluster you have to use the vglrun command like in the following example:
$ vglrun glxgears -info