[Paraview] Setting up Paraview Web on a headless Fedora server with GPU

Fri May 6 07:06:11 EDT 2016

Thanks Sebastien. It seems I'm getting somewhere - I installed "slim" instead of xdm, and had the 
paraview user login automatically. Now when I login via ssh, I can see the X server is running, and 
the paraview user has the ~/.Xauthority file created in its homedir (so I guess it did login 
successfuly). The DISPLAY variable is still unset, but I get a new error if I set it manually:

[paraview at vbl-sim ~] $ DISPLAY=:0 glxinfo
Invalid MIT-MAGIC-COOKIE-1 keyError: unable to open display :0

and the same error for any X program (so I can't run i.e. "xhost +" recommended somewhere). This 
situation persists through restarts. I trie ro remove the ~/.Xauthority file as recommended 
elsewhere, but that didn't help either.

(I also tried a second method - starting the launcher through .xinitrc, but it seems slim ignores 
this file altogether. That's a different problem anyways, as for testing it would be more 
comfortable if I could launch the server form command line)

Jiri

On 05/05/16 16:23, Sebastien Jourdain wrote:
> You were on the right track with DISPLAY=:0 but I'm wondering if you setup a "virtual" monitor or 
> if your "paraview" user is auto logged in a X session or if it stuck at the "login" panel?
>
> You can find some information about the virtual screen here: (Search for "Screen")
>
> http://kitware.github.io/paraviewweb/docs/guides/graphics_on_ec2_g2.html
>
> And for the autologin if it is needed. (Note on EC2 the user start X hence no need to login...)
>
> https://github.com/Kitware/paraviewweb/blob/master/tools/ansible/roles/paraview/tasks/Ubuntu.yml
>
> Seb
>
> On Thu, May 5, 2016 at 6:58 AM, Jiří Vyskočil <jiri.vyskocil at fjfi.cvut.cz 
> <mailto:jiri.vyskocil at fjfi.cvut.cz>> wrote:
>
>     Hello,
>
>
>     I'm trying to set up a Paraview Web server on a Fedora 23 machine. The serves is not connected
>     to a monitor or a keyboard (I only have access through ssh), but it has a nvidia GPU which I
>     want to use for paraview.
>
>
>     I have installed xdm to run the X server, and verified that it is in fact running with the
>     correct nvidia drivers (by checking the Xorg.0.log file). The problem is I don't know how to
>     run the paraview webserver on the X display when there's no one physically logged in - I can
>     only get to the server via ssh. When I log in, and switch to the paraview user, the DISPLAY
>     and XAUTHORITY variables are empty.
>
>
>     The webserver itself is running (apache + the python launcher), but when I try to open any of
>     the example applications, I get an error like this:
>
>
>     $ ./launch-paraview.sh
>     2016-05-05 14:54:17,528:INFO:twisted:Site starting on 9000
>     2016-05-05 14:54:17,528:INFO:twisted:Starting factory <twisted.web.server.Site instance at
>     0x7fe20da6a998>
>     2016-05-05 14:55:09,655:INFO:twisted:"127.0.0.1" - - [05/May/2016:12:55:09 +0000] "POST
>     /paraview/ HTTP/1.1" 503 78 "https://vbl-sim.eli-beams.eu/apps/Visualizer/" "Mozilla/5.0 (X11;
>     Fedora; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0"
>
>
>     $ cat 965318f2-12c0-11e6-a3cb-002590e6af35.txt
>     2016-05-05 14:55:06+0200 [-] Log opened.
>     ERROR: In
>     /home/strazce/hax/ParaView-v5.0.0-source/VTK/Rendering/OpenGL/vtkXOpenGLRenderWindow.cxx, line 333
>     vtkXOpenGLRenderWindow (0x3f00be0): bad X server connection. DISPLAY=
>
>
>     Specifying DISPLAY=:0 when running the launcher gives this error:
>
>     $ cat e73921bc-12c0-11e6-b002-002590e6af35.txt
>     2016-05-05 14:57:22+0200 [-] Log opened.
>     No protocol specified
>     No protocol specified
>     No protocol specified
>     ERROR: In
>     /home/strazce/hax/ParaView-v5.0.0-source/VTK/Rendering/OpenGL/vtkXOpenGLRenderWindow.cxx, line 333
>     vtkXOpenGLRenderWindow (0x4127c10): bad X server connection. DISPLAY=:0. Aborting.
>
>
>
>     Thanks for any hints,
>
>     Jiri
>
>
>
>
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