Start x11vnc server at KDM or GDM starup using systemd

x11vnc-server.sh

#!/bin/bash

# This is run from /etc/systemd/system/x11vnc.service
# This is run at KDM, not when user logs in, therefore the systemd
# unit is running as root user
# mReschke 2016-04-07

# Systemd unit file:
# ---------------------------------------------------
#[Unit]
#Description=VNC Server for X11

#[Service]
#Type=forking
#User=root
#ExecStart=/usr/local/bin/x11vnc-server
#Restart=on-failure

#[Install]
#WantedBy=multi-user.target
# ---------------------------------------------------

# To create/change your password file, run
# x11vnc -storepasswd yourPassHere /etc/x11vnc.pass

# Find the MIT-MAGIC-COOKIE file
# This works!  But you can now just use -auth guess to find it automatically
#cookieFile=$(ps aux | grep -iv grep | grep '/var/run/xauth/A' | sed -n -e 's/.*\/var/\/var/p')
#echo "Running x11vnc with cookieFile: $cookieFile" >> /tmp/x11vnc-server.alive

# Start x11vnc
/usr/bin/x11vnc \
        -norc \
        -forever \
        -shared \
        -bg \
        -rfbauth /etc/x11vnc.pass \
        -autoport 5900 \
        -o /var/log/x11vnc.log \
        -display :0 \
        -auth guess
# -auth $cookieFile




# From x11vnc notes
# ---------------------------------------------------
#** If NO ONE is logged into an X session yet, but there is a greeter login
#   program like "gdm", "kdm", "xdm", or "dtlogin" running, you will need
#   to find and use the raw display manager MIT-MAGIC-COOKIE file.
#   Some examples for various display managers:
#
#     gdm:     -auth /var/gdm/:0.Xauth
#              -auth /var/lib/gdm/:0.Xauth
#     kdm:     -auth /var/lib/kdm/A:0-crWk72
#              -auth /var/run/xauth/A:0-crWk72
#     xdm:     -auth /var/lib/xdm/authdir/authfiles/A:0-XQvaJk
#     dtlogin: -auth /var/dt/A:0-UgaaXa
#
#   Sometimes the command "ps wwwwaux | grep auth" can reveal the file location.
#
#   Starting with x11vnc 0.9.9 you can have it try to guess by using:
#
#              -auth guess
#
#   (see also the x11vnc -findauth option.)