Sokolova-lapa at 14:27, 11 April 2018

2018-04-11T14:27:49Z

Sokolova-lapa: Created page with " Category:Working Remotely = Working remotely using XPRA and SSH = [https://www.xpra.org/ XPRA] allows you to start remote X programs and display them on your local mac..."

2018-04-11T14:22:38Z

Created page with " Category:Working Remotely = Working remotely using XPRA and SSH = [https://www.xpra.org/ XPRA] allows you to start remote X programs and display them on your local mac..."

New page

[[Category:Working Remotely]]

= Working remotely using XPRA and SSH =

[https://www.xpra.org/ XPRA] allows you to start remote X programs and display them on your local machine. [[Winswitch|Winswitch]] uses XPRA internally, but you can use it directly as well. Especially, you can use the speed of [[SSH|SSH]] for commands, but don't need to use X11-forwarding during your SSH-connection, which can be very slow.

First, you need to install XPRA on your local machine. If you are using a Debian-based UNIX-system you can get XPRA via
<pre>
sudo apt-get install xpra
</pre>
Please note that you might not get the current version of XPRA depending on your distribution. Instead you can add the [[Winswitch|winswitch]]-repository to your package list.

step 1: starting an XPRA-server at Remeis

First establish a SSH-connection to your favourite machine on Remeis:
<pre>
you@local:~> ssh constellation.sternwarte.uni-erlangen.de
</pre>
Now start an XPRA-server using
<pre>
username@constellation:~> xpra start :123
</pre>
The :123 is an arbitrary display port which any X program will use in a minute. Please note that :0 is reserved for the physical display on your remote desk! To ensure that all X programs will use the XPRA-server you need to modify the DISPLAY environmental variable. In a [[csh:start|CSH]], you can use
<pre>
username@constellation:~> setenv DISPLAY :123
</pre>

step 2: connecting to the XPRA-server

Finally, to display all X program on your local machine, open a new shell and attach the XPRA-session:
<pre>
you@local:~> xpra attach ssh:constellation.sternwarte.uni-erlangen.de:123
</pre>
Here, :123 is again the display port XPRA is using. Any X program or window you start in the SSH-connection will open at your local machine. This work even for plot windows in, e.g., ISIS.

step 2+N: open more SSH connections

Once you need N more terminals on the remeis machines, but still want to forward their X windows to your local machine, just start another SSH-connection and set the DISPLAY variable:
<pre>
you@local:~> ssh constellation.sternwarte.uni-erlangen.de
username@constellation:~> setenv DISPLAY :123
</pre>

final step: shutting down the XPRA-server

If your done with your work you should stop the XPRA-server to free the display port:
<pre>
username@constellation:~> xpra stop :123
</pre>

@@ Line 23: / Line 23: @@
 username@constellation:~> xpra start :123
 </pre>
-The :123 is an arbitrary display port which any X program will use in a minute. Please note that :0 is reserved for the physical display on your remote desk! To ensure that all X programs will use the XPRA-server you need to modify the DISPLAY environmental variable. In a [[csh:start|CSH]], you can use
+The :123 is an arbitrary display port which any X program will use in a minute. Please note that :0 is reserved for the physical display on your remote desk! To ensure that all X programs will use the XPRA-server you need to modify the DISPLAY environmental variable. In a [[TcShell|CSH]], you can use
 <pre>
 username@constellation:~> setenv DISPLAY :123

XPRA and SSH - Revision history

Sokolova-lapa at 14:27, 11 April 2018

Sokolova-lapa: Created page with " Category:Working Remotely = Working remotely using XPRA and SSH = [https://www.xpra.org/ XPRA] allows you to start remote X programs and display them on your local mac..."