# necessary env for gui target, though may not suitable for xvfb
export XAUTHORITY=/root/.Xauthority
export DISPLAY=:1
# kill previous running x11vnc, if exists
joker list | grep x11vnc | awk '{print $1}' | xargs -iabc kill -s KILL abc
# launch new vnc
joker x11vnc -threads -forever -rfbauth /root/.vnc/passwd