problems with autostarting vnc server

[Adel Ahmed]

I have installed tigervnc and created a script to autostart the vnc servers:
/etc/systemd/system/tigervnc@.service:
[Unit]
Description=Remote desktop service (VNC)
After=network.target

[Service]
Type=forking
User=adel

# Clean any existing files in /tmp/.X11-unix environment
ExecStartPre=-/usr/bin/vncserver -kill %i
ExecStart=/usr/bin/vncserver %i
ExecStop=/usr/bin/vncserver -kill %i

[Install]
WantedBy=multi-user.target

if I start the vnc serve by running vncserver :3 as the user adel, everything is fine
If i start via systemctl start tigervnc@3 I get the following in the journal
Apr 12 04:30:53 pc vncserver[6916]: Can't tell if 3 is on pc
Apr 12 04:30:53 pc vncserver[6916]: Use -kill :<number> instead
Apr 12 04:30:53 pc vncserver[6921]: usage: vncserver [:<number>] [-name <desktop-name>] [-depth <depth>]
Apr 12 04:30:53 pc vncserver[6921]: [-geometry <width>x<height>]
Apr 12 04:30:53 pc vncserver[6921]: [-pixelformat rgbNNN|bgrNNN]
Apr 12 04:30:53 pc vncserver[6921]: [-fp <font-path>]
Apr 12 04:30:53 pc vncserver[6921]: [-cc <visual>]
Apr 12 04:30:53 pc vncserver[6921]: [-fg]
Apr 12 04:30:53 pc vncserver[6921]: [-autokill]
Apr 12 04:30:53 pc vncserver[6921]: <Xvnc-options>...
Apr 12 04:30:53 pc vncserver[6921]: vncserver -kill <X-display>
Apr 12 04:30:53 pc vncserver[6921]: vncserver -list
Apr 12 04:30:53 pc systemd[1]: tigervnc@3.service: control process exited, code=exited status=2
Apr 12 04:30:53 pc systemd[1]: Failed to start Remote desktop service (VNC).
Apr 12 04:30:53 pc systemd[1]: Unit tigervnc@3.service entered failed state.


thanks

[Adel Ahmed]

bump

[Logicien]

I start the X11VNC server as a normal user after I have open an X session with this user. If you start the VNC server with Systemd, it will be start by the super user root. The super user root do not open any X session by default. The VNC server may not be able to start because it do not have any X session to serve.

And if there is an X session open, if it's not open by root himself, root do not have access to it by default.

It may be possible to start the VNC server using Systemd, but I prefer to start it during a normal user X session. X11VNC do not need root permissions to serve. It can be automate using the desktop environment method.
_________________
Paul