If you already have x11vnc server working on Raspberry Pi but you have to start it manually every time you reboot your Pi, here’s how you can make it start automatically:
Open the terminal, or login via SSH and run this commands:
# login as super user
# edit start up script
# add the command that can start x11vnc (explain)
sudo -u pi /usr/bin/x11vnc -find
The command runs x11vnc as user pi (default user on Raspbian) and uses -find argument to let x11vnc guess the display an xauthority method. Worked like a charm for me, hope it will help others too.
Not sure if required, but I have x11vnc settings exported to file ~/.x11vncrc. You can do this via x11vnc UI.