Start x11vnc on init based systems

If you want to start a VNC server before login on your Linux machine a good option is to make the graphical login manager start the VNC server.

Create /etc/init/x11vnc:

vi /etc/init/x11vnc

Then paste:

start on login-session-start
/usr/bin/x11vnc -xkb -auth /var/run/lightdm/root/:0 -noxrecord -noxfixes -noxdamage -rfbauth /etc/x11vnc/passwd \
-forever -bg -gone "xscreensaver-command -lock" -nodpms -rfbport 5900 -httpdir /usr/share/vnc-java/ -httpport 5800 \
-rfbversion 3.6 -permitfiletransfer -shared -dontdisconnect -alwaysshared -o /var/log/x11vnc.log
end script

The above line presumes you are using lightdm and you have setup x11vnc with a password file.