That is incorrect advice. VirtualGL (at least the current version)
requires two X servers:
The 3D X server runs on the server machine and is used only to access
the server-side GPU. vglserver_config is used to grant access to the 3D
X server while the display manager is sitting at the login prompt.
The 2D X server can be either a real client-side X server or a
server-side X proxy (such as VNC or Xpra.) The 2D X server is used to
display the non-OpenGL portions of the application's GUI and to display
rendered images of the OpenGL portions of the application's GUI. Those
images are delivered to the 2D X server by VirtualGL using an "image
transport."
At no point is 'ssh -X' invoked directly in a VirtualGL workflow. If
using a client-side 2D X server, then the VGL Transport is recommended.
That requires invoking 'vglconnect' on the client, which wraps 'ssh -X'
but also automatically starts the VirtualGL Client (vglclient.) If
using a server-side X proxy as a 2D X server, then the X11 Transport is
recommended, and SSH X forwarding is irrelevant.
On 6/8/21 3:08 PM, Spencer Bliven wrote:
Looks like you don't have X11 running. Most likely you forgot the -X
option when connecting with ssh. Try running `xeyes` or similar to
verify that you have X11 working. After that vglrun should work.
-Spencer
On 8 June 2021 at 20:55:55, Emanuel ([email protected]
<mailto:[email protected]>) wrote:
I need some help with how to resolve the vglserver_config/vglrun
issue below.
Installing VirtualGL 2.5.1 on Ubuntu 20.04 has been problematic. I
have tried VirtualGL 2.6.5 as well on Ubuntu 20.04 but no luck.
VirtualGL 2.5.1 install on Ubuntu 18.04 works.
A reboot after running vglserver_config on Ubuntu 20.04 results in a
blank screen with a blinking cursor; system comes back up on the
network however - which allows me to run the vglrun command.
server:opt/apps/tigervnc/1.10.1/usr/bin$ vglrun glxgears
[VGL] ERROR: Could not open display :0.
server:/opt/apps/tigervnc/1.10.1/usr/bin$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal
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