[Thinlinc-technical] Export DISPLAY into Thinlinc session

[Carsten John]

Hi Mathias,

we use a similar setup to start all applications on back end servers, but we use ssh with X11 forwarding instead of plain X11. Makes things a little bit easier when a firewall placed between Thinlinc server and back end...

just an idea


Carsten


-----Original message-----
> From:Mattias Molin <mattias.molin at ericsson.com>
> Sent: Thursday 3rd December 2015 7:13
> To: thinlinc-technical at lists.cendio.se
> Subject: [Thinlinc-technical] Export DISPLAY into Thinlinc session
> 
> Hi all!
> 
> I have searched through the documentation, all topics in the mailing 
> list + searched the net for clues but I am not successful in finding 
> what I want. I would appreciate some help to get me going in the right 
> direction solving my problem.
> 
> *** In short:
> 
> I am having problems exporting DISPLAY from another machine into a start 
> Thinlink session (using the official ThinLinc client).
> 
> *** Problem description:
> 
> In our solution we will run multiple servers hosting various kinds of 
> software. These applications should be started locally but should be 
> displayed within a ThinLinc Client session. In particular we will later 
> use the HTML5 as the ThinLinc client but the HTML-client is not being 
> used at the moment (until this problem is solved). For simplicity and to 
> get some progress in solving the basic issues I am currently using 
> xclock and xterm as example applications. These applications are not 
> supposed to be used in the final solution - only for troubleshooting.
> 
> *** Host overview:
> 
> Guest1, with IP .91: This machine holds the binaries/applications. In 
> this case currently xterm and xclock. This is where applications are 
> started.
> Guest2, with IP .92: This machine has Cendio installed and acts as 
> Master/Agent. This is where applications should display. Xclock or xterm 
> are NOT installed in this host.
> 
> Both Guest1 and B are currently running in VirtualBox with CentOS 6.5 
> (limited) + Gnome desktop (hence all X deps exist) installed.
> 
> *** Basic test (that works):
> 
> I am logged into both hosts (Guest1 and Guest2) in a more "normal" 
> manner - i.e. using the VirtualBox GUI.
> 
> * Guest2 (192.168.0.92):
> 
> [vagrant at guest2 ~ ]$ xhost +
> access control disabled, clients can connect from any host
> [vagrant at guest2 ~ ]$ env | grep DISPLAY
> DISPLAY=:0.0
> 
> * Guest1 (192.168.0.91):
> 
> [vagrant at guest1 ~ ]$ export DISPLAY="192.168.0.92:0"
> [vagrant at guest1 ~ ]$ xclock
> 
> This basic test works fine. Xclock is started on Guest1 and shows up on 
> Guest2 as expected.
> 
> *** Extended test (that fails):
> 
> I am logged into Guest1 using the VirtualBox GUI while connected to 
> Guest2 via the ThinLinc Client.
> 
> * Guest2 (192.168.0.92):
> 
> [vagrant at guest2 ~ ]$ xhost +
> access control disabled, clients can connect from any host
> [vagrant at guest2 ~ ]$ env | grep DISPLAY
> DISPLAY=:1.0
> 
> * Guest1 (192.168.0.91):
> 
> [vagrant at guest1 ~ ]$ export DISPLAY="192.168.0.92:1"
> [vagrant at guest1 ~ ]$ xclock
> Error: Can't open display: 192.168.0.92:1
> [vagrant at guest1 ~ ]$ export DISPLAY="192.168.0.92:1.0"
> [vagrant at guest1 ~ ]$ xclock
> Error: Can't open display: 192.168.0.92:1.0
> 
> This operation fails. I am sure I am missing the point somewhere or I 
> need to do something with the Cendio server config. I just do not have a 
> clue what to do to make this work. Any ideas? Any help or ideas are 
> appreciated!
> 
> BR / Mattias
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