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vglconnect with -e = "The server does not appear to have VirtualGL 2.1 or later installed" #53

Closed PhilippeRaven closed 7 years ago

PhilippeRaven commented 7 years ago

Hello ! I'm proudly using VGL since some years now, and it works great. I never really used vglconnect because vglrun -d was enough for my needs, but today I need to encrypt X11 and VGL. After re-reading the doc, it seems the only way to encrypt X11 is to use the vglconnect -s argument. So I tried it, it works. And there's the -e argument, which is VERY interesting, BUT, I can't use it. Each time I try to "vglconnect -s user@server -e glxgears" for example, I get the "The server does not appear to have VirtualGL 2.1 or later installed" error, I don't understand why.

I'm using VGL 2.5.2 on both client & server.

Thanks for your help :) Regards

dcommander commented 7 years ago

The -e argument has to come before user@server, because -e is an argument to the vglconnect script whereas user@server is an argument to SSH. Also, you still need to use vglrun, you need to enclose the command passed to -e in quotes, and I recommend GLXspheres as a test application rather than GLXgears, so try this:

vglconnect -s -e "vglrun -sp /opt/VirtualGL/bin/glxspheres64" user@server

You might also want to add -tt to the end of the command line. That forces SSH to allocate a pseudo-terminal, so you will see the output from the application in real time (line buffered as opposed to full buffered.)

PhilippeRaven commented 7 years ago

Hello Dcommander, thanks for this quick reply ! It works like you said, with the -e argument before user@server.

I tried the -tt argument at the end : 

 vglconnect -s -e "vglrun -sp /opt/VirtualGL/bin/glxspheres64" user@server -tt

VirtualGL Client 64-bit v2.5.2 (Build 20170302)
vglclient is already running on this X display and accepting unencrypted
   connections on port 4242.

Making preliminary SSH connection to find a free port on the server ...
user@server's password: 
Connection to server closed.
Making final SSH connection ...
:localhost:4242'rding specification '50056

It stops there.

dcommander commented 7 years ago

Works on my version of OpenSSH. It may be version-specific. man ssh.