Encountering VGL Error - Could not open display 0

[VGL] NOTICE: Automatically setting VGL_CLIENT environment variable to
[VGL] xxx.xxx.xxx.xxx, the IP address of your SSh client.
No protocol specified
[VGL] ERROR: Could not open display :0.

Do note that for VirtualGL has to connect :0 to access the 3D Graphic Card. Apparently, VGL cannot get access to the display :0



Possible resolution 1:
Is the X Server up? X Server should be up to allow connection to display :0



Possible resolution 2:
Granting access the 3D X Server Read  Granting Access to the 3D X Server from VirtualGL Documentation



Possible resolution 3:
After configuring access to the 3D X Server and booting to init 5, you should log off completely and log in for the VirtualGL test. I did not log-off and was wondering why I have the above error.

There may be other resolutions.....Will document when it comes along

Using xdpyinfo to display information utility for X

According to the manual page, xdpyinfo is a useful utility for diaplaying information about an X server. It can be used to examine

1. Capabilities of the server
2. Predefined values for various parameters in communicating between clients and the server
3. Different types of screen and visuals available

Commands to use

# xdpyinfo -display :0

Using TurboVNC 0.6 and VirtualGL 2.1.4 to run OpenGL Application Remotely on CentOS

For more information on Using TurboVNC 0.6 and VirtualGL 2.1.4 to run OpenGL Application Remotely on CentOS on Linux Cluster

“VirtualGL is an open source package which gives any Unix or Linux remote display software the ability to run OpenGL applications with full 3D hardware acceleration…..With VirtualGL, the OpenGL commands and 3D data are instead redirected to a 3D graphics accelerator on the application server, and only the rendered 3D images are sent to the client machine……” For more information see What is VirtualGL? from Project Website"

Determining if Intel Virtualization Technology or AMD Virtualization is enabled in the BIOS without rebooting

If you are using Vmware Technology for your Virtualisation, you may find this information useful.

Taken from Vmware KB Determining if Intel Virtualization Technology or AMD Virtualization is enabled in the BIOS without rebooting (Jul 29 2010). Simplified at my blog Determining if Intel Virtualization Technology or AMD Virtualization is enabled in the BIOS without rebooting (Virtual Machine Journal)

Product Versions affected:

VMware ESX 3.0.x
VMware ESX 3.5.x
VMware ESX 4.0.x
VMware ESXi 3.5.x Embedded
VMware ESXi 3.5.x Installable
VMware ESXi 4.0.x Embedded
VMware ESXi 4.0.x Installable

Installing Linux Kernal-Based Virtual Machine (KVM) on CentOS 5.4 Server

This guide is modified from the article from Howtoforge – “Virtualization With KVM On A CentOS 5.2 Server“  and IBM – Quick Start Guide for installing and running KVM.

1. Installing Linux Kernal-Based Virtual Machine (KVM) on CentOS 5.4 Server (Part I)
2. Installing Linux Kernal-Based Virtual Machine (KVM) on CentOS 5.4 Server (Part II)