x11VNC Questions.

AcidRa1n · 02-26-2015, 12:44 PM

I have an Asus Chromebox running Ubuntu 14.10 in my office's lobby for a monitoring system.

I have SSH and x11VNC setup.

My current process is logging in Via SSH and using this command:

sudo x11vnc -display :0 -auth /var/lib/lightdm/.Xauthority

to start the VNC.

First question: Why is is that after closing my viewer and disconnecting from the VNC I have to re-input that command to start the VNC server again to allow me to connect.
This is a hassle. Especially because my CO-Worker needs to access the box sometimes as well. I would like to just start it once and have it work for as long as possible.

Second question: I would like x11VNC to start up upon boot up.
You can probably see why this is my second question. I only want to do this once I find out why the session seems to expire. I do not want to have to keep restarting the VNC to connect.

sudowtf · 02-26-2015, 02:07 PM

Code:

-forever               Keep listening for more connections rather than exiting
                       as soon as the first client(s) disconnect. Same as -many

                       To get the standard non-shared VNC behavior where when
                       a new VNC client connects the existing VNC client is
                       dropped use:  -nevershared -forever   This method can
                       also be used to guard against hung TCP connections that
                       do not go away.

https://stackoverflow.com/questions/...r-linux-ubuntu

AcidRa1n · 02-26-2015, 03:50 PM

Quote:

Originally Posted by sudowtf

Code:

-forever               Keep listening for more connections rather than exiting
                       as soon as the first client(s) disconnect. Same as -many

                       To get the standard non-shared VNC behavior where when
                       a new VNC client connects the existing VNC client is
                       dropped use:  -nevershared -forever   This method can
                       also be used to guard against hung TCP connections that
                       do not go away.

https://stackoverflow.com/questions/...r-linux-ubuntu

Sorry, I've used Linux off and on over the years. I believe I know how to make it start on boot. However I do not want to try it without making sure the VNC serverstay on after disconnecting. Can you give me a little more info?

So I need to use -forever?

sudowtf · 02-27-2015, 07:39 AM

yes x11vnc -forever [...]
or
x11vnc -nevershared -forever [...]
depending on your desire

sudo x11vnc -forever -display :0 -auth /var/lib/lightdm/.Xauthority

AcidRa1n · 02-27-2015, 09:13 AM

Quote:

Originally Posted by sudowtf

yes x11vnc -forever [...]
or
x11vnc -nevershared -forever [...]
depending on your desire

sudo x11vnc -forever -display :0 -auth /var/lib/lightdm/.Xauthority

Thank you so much, that solves that problem.

AcidRa1n · 02-27-2015, 09:57 AM

Edit: Nevermind

sudowtf · 02-27-2015, 09:59 AM

you run this command ONCE and never again unless it crashes and needs to be restarted.

you can run it in the background by appending an "&" after the command, or sometimes i prefer to run things in a 'screen' session

AcidRa1n · 02-27-2015, 10:35 AM

Quote:

Originally Posted by sudowtf

you run this command ONCE and never again unless it crashes and needs to be restarted.

you can run it in the background by appending an "&" after the command, or sometimes i prefer to run things in a 'screen' session

Yea I did. Starts up good. I experienced a little glitch.

AcidRa1n · 02-27-2015, 10:41 AM

Quote:

Originally Posted by sudowtf

you run this command ONCE and never again unless it crashes and needs to be restarted.

you can run it in the background by appending an "&" after the command, or sometimes i prefer to run things in a 'screen' session

I am actually struggling to get my KRDC to autostart and login.. Do you know what I can add in Cron for that?

sudowtf · 02-27-2015, 10:53 AM

i recall it glitching for me too, i found my launcher which stopped the "glitches":

Code:

sudo x11vnc -forever -usepw -display :0 -autoport 5900 -nap -noxdamage -nolookup -auth guess  -allow 192.168. &

Specifically i think it's the -noxdamage.
Also notice the -allow to only allow 192.168.0.0/16 (you can use -allow multiple times, ex: -allow 25. -allow 10.0.0. -allow -192.168.1.)
The -usepw requires you to previously configured a password.

If it still tends to die, you could alway write a wrapper:

Code:

#!/bin/sh
while true
do
  echo "[re]starting"
  sudo x11vnc -forever -usepw -display :0 -autoport 5900 -nap -noxdamage -nolookup -auth guess -allow 192.168.   #no "&" here
  echo "Died"
  echo
done

sudowtf · 02-27-2015, 10:55 AM

Quote:

Originally Posted by AcidRa1n

I am actually struggling to get my KRDC to autostart and login.. Do you know what I can add in Cron for that?

i do not.