Running a GUI application on an other computer

There are two ways the more complicated remote desktop way where the complete screen of a computer is transmitted ore the more native UNIX/Linux way to just use X forwarding having the application running on one computer and having its Gui window appearing on an other computer.

X11 forwarding

X forwarding is the native historical X way to have graphical terminals attached to a central computer.

X forwarding allows an X11 client (screen) to be connected to a X11 server using ssh.

Since security is a topic this might be disabled by default so check on the server the configuration file /etc/ssh/sshd_config for:

X11Forwarding yes

Restart ssh to take effect, as for openRC /etc/init.d/sshd reload

To know what screen to use check echo $DISPLAY on the client. If nothing is shown fix it by running export DISPLAY=':0.0' or when logged in at the server with export DISPLAY='' using the IP address of the client.

Then on the client commands as ssh -Y <server name> /usr/bin/leafpad or ssh -X <server name> /usr/bin/leafpad can be entered in the console to have a GUI window popping up.

An other sequence is ssh -Y <username>@<server name> and then typing in the commands as leafpad& where the & character puts the GUI application in background so additional application can be started from the console (as su and then starting commands as root as elogviewer&).

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