I am using vncserver to connect to a CentOS7 machine in the network. In 
order to make use of 3D graphics accelerations I am using VirtualGL 
<https://virtualgl.org/>. So any OpenGL program needs to be launched with 
*vglrun 
* to make use of OpenGL. 

This works like a charm but only if I log myself in on DISPLAY 0 and launch 
at least one OpenGL application beforehand. In other words:

If I 

   - reboot the machine, 
   - directly start a vncserver and 
   - connect to it with a client,

no OpenGL application is working and I get the error 

[VGL] ERROR: Could not open display :0.

As soon as I log myself in on DISPLAY 0 and start an OpenGL application the 
error does not occur anymore until the machine is rebooted again.

My question:
How can I run OpenGL applications with *vglrun* without first running an 
OpenGL application on DISPLAY 0 after rebooting the machine?

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