So I'm trying to get this running locally on our system, but run into an
issue.
The batch script to launch the VNC server on a compute node pretty much
does this:
/usr/bin/X &
TVNC_MT=1 TVNC_NTHREADS=4
XDG_DATA_DIRS=$XDG_DATA_DIRS:/usr/local/share/:/usr/share/ \
/opt/TurboVNC/bin/vncserver \
-vgl -wm xfce \
-fg \
-geometry 1240x900 \
-dpi 90
When the VNC server starts up it exits quickly:
snellius paulm@gcn154 17:28 ~$ TVNC_MT=1 TVNC_NTHREADS=4
XDG_DATA_DIRS=$XDG_DATA_DIRS:/usr/local/share/:/usr/share/
/opt/TurboVNC/bin/vncserver -vgl -wm xfce -fg -geometry
1240x900 -dpi 90
Desktop 'TurboVNC: gcn154.local.snellius.surf.nl:1 (paulm)' started on
display gcn154.local.snellius.surf.nl:1
Starting applications specified in /opt/TurboVNC/bin/xstartup.turbovnc
(Enabling VirtualGL)
Log file is /home/paulm/.vnc/gcn154.local.snellius.surf.nl:1.log
Killing Xvnc process ID 1426621
Looking in the VNC log file:
25/09/2024 17:14:01 framebuffer updates 0, rectangles 0, bytes 0
xstartup.turbovnc: Creating new session bus instance:
xstartup.turbovnc:
unix:abstract=/tmp/dbus-qn7ynuWttb,guid=fd2fba716838b6b1474ecf7f66f428b9
xstartup.turbovnc: Using 'xfce' window manager in
xstartup.turbovnc: /usr/share/xsessions/xfce.desktop
xstartup.turbovnc: Executing /usr/bin/ssh-agent vglrun +wm
/etc/X11/xinit/Xsession "startxfce4"
Environment variable $XAUTHORITY not set, ignoring.
Failed to import environment: Process org.freedesktop.systemd1 exited with
status 1
/bin/startxfce4: X server already running on display :1
The "already running on display :1" message is really curious. There isn't
any existing XFCE session running on the node. I found a (very old, 2014)
forum post and link to bug report that lists the same error,
https://bbs.archlinux.org/viewtopic.php?id=180965.
But I'm not sure if this is still relevant?
This is with TurboVNC 3.1.1 and VirtualGL 3.1.1 on a RHEL9 compute node,
btw. The installed XFCE is 4.18.3. I still need to test on our regular
visualization nodes with A100s, the above is one with an H100, but I think
the startup doesn't even come close anything GPU related.
On Friday, September 6, 2024 at 5:45:18 PM UTC+2 DRC wrote:
> No downsides. As a matter of fact, TurboVNC makes that easier for you.
> You can simply pass '-vgl -wm xfce' to /opt/TurboVNC/bin/vncserver, or set
>
> $useVGL = 1;
> $wm = "xfce";
>
> in turbovncserver.conf (under /etc for system-wide or ~/.vnc for
> per-user). The -wm argument/$wm variable correspond to a session desktop
> file under /usr/share/xsessions. In the case of Xfce, the session desktop
> file does nothing but run startxfce4, but other window managers (e.g.
> GNOME) sometimes have additional arguments or environment variables
> embedded in their session desktop files, so using -wm/$wm is the preferred
> way to start a window manager these days.
> /opt/TurboVNC/bin/xstartup.turbovnc should take care of all of the
> mechanics automatically. Also, you should use xstartup.turbovnc rather
> than overriding the X startup script, because xstartup.turbovnc sets up a
> separate D-Bus session bus instance for each TurboVNC session. (Some
> window managers, such as GNOME and MATE, need that in order to run multiple
> simultaneous sessions.)
> All window managers listed here:
>
> https://turbovnc.org/Documentation/Compatibility30
>
> have been tested both with and without VirtualGL.
>
> DRC
> On 9/6/24 7:21 AM, Paul Melis wrote:
>
> Hi, I saw this handy tip somewhere, to start the desktop environment
> within a VNC server under vglrun, e.g. `-xstartup "vglrun xfce4"` when
> using TurboVNC with XFCE. This avoids the user within the VNC session to
> have to use vglrun for OpenGL apps, but I'm wondering if there's downsides
> to this approach that I might be missing.
>
> Paul
>
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