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Re: graphical session in LXC automatically started at boot and reachable via VNC/RDP/X2GO

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Yvan Masson writes:

[...]

> What I did not understand from your answers (sorry maybe I missed something)  
> is how to start the graphical session automatically when the container  
> starts, so that the software can be started and listening on the network,  
> and then later someone can attach to this session with VNC/RDP/X2GO. It  
> seems your script Linux-Fan starts a VNC server, but does it start a session  
> in it?

I did not mention it explicitly, because with the VNC server I am using  
(`tightvncserver`) does this automatically.

The trick most important steps are as follows:

 * Prepare a configuration for the session of interest to start, I have these
   lines in my "Dockerfile" (i.e. image preparation stage):

	echo \$vncStartup = \"exec /usr/bin/icewm\" > $HOME/.vncrc; \
	[...]
	printf "%s\n\n%s\n" "#!/bin/sh -e" "/usr/bin/megasync &" \
						> /etc/X11/icewm/startup; \

   This way, it configures `icewm` to be the window manager to use and
   uses IceWM's autorun facility to start my program of interest (`megasync`).

 * In the container's startup script, run the VNC server.

	/usr/bin/vncserver -geometry 1024x768 :0

   This will start `icewm` (as configured in `.vncrc`) which (by configuration
   in `/etc/X11/icewm/startup`) runs `megasync`.

   See also: vncserver(1) --
   https://manpages.debian.org/buster/tightvncserver/tightvncserver.1.en.html

 * To automatically start the container upon OS boot, I use Docker's
   `--restart=unless-stopped`. This will be different for LXC of course!

 * For the gory details of setting passwords, making the right files
   executable or resuming from "crashed" sesions (i.e. delete temp files)
   check the respective source codes:

   https://github.com/m7a/lo-megasync/blob/master/megasync_ctrl.sh
   https://github.com/m7a/lo-megasync/blob/master/Dockerfile

HTH
Linux-Fan

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graphical session in LXC automatically started at boot and reachable  via VNC/RDP/X2GO Yvan Masson <yvan@masson-informatique.fr> - 2020-12-29 22:10 +0100
  Re: graphical session in LXC automatically started at boot and  reachable via VNC/RDP/X2GO Georgi Naplatanov <gosho@oles.biz> - 2020-12-29 22:30 +0100
  Re: graphical session in LXC automatically started at boot and          reachable via VNC/RDP/X2GO Linux-Fan <Ma_Sys.ma@web.de> - 2020-12-30 00:20 +0100
    Re: graphical session in LXC automatically started at boot and  reachable via VNC/RDP/X2GO Yvan Masson <yvan@masson-informatique.fr> - 2020-12-30 20:40 +0100
      Re: graphical session in LXC automatically started at boot and          reachable via VNC/RDP/X2GO Linux-Fan <Ma_Sys.ma@web.de> - 2020-12-30 23:50 +0100
        Re: graphical session in LXC automatically started at boot and  reachable via VNC/RDP/X2GO Yvan Masson <yvan@masson-informatique.fr> - 2020-12-31 09:30 +0100
          Re: graphical session in LXC automatically started at boot and          reachable via VNC/RDP/X2GO Linux-Fan <Ma_Sys.ma@web.de> - 2020-12-31 14:20 +0100

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