0_Usage.md

Build the docker image and start the container.

Start Xvfb in the container via

$ /etc/init.d/xvfb start

Run Chrome with working WebGL in kiosk mode

$ google-chrome \
  --no-first-run \
  --user-data-dir=/tmp/chrome \
  --no-sandbox \
  --enable-logging=stderr \
  --use-gl=osmesa \
  --app=<some-url>

Open another shell into the container and take a screenshot:

$ import -window root screenshot.png

😎 Profit.

Dockerfile

#
# Ubuntu Dockerfile
#
# https://github.com/dockerfile/ubuntu
#

# Pull base image.
FROM ubuntu:16.04

ADD xvfb /etc/init.d/xvfb

# Install.
RUN \
  sed -i 's/# \(.*multiverse$\)/\1/g' /etc/apt/sources.list && \
  apt-get update && \
  apt-get -y upgrade && \
  apt-get install -y wget && \

  # Chrome PPA
  wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - && \
  sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list' && \
  apt-get update && \
  apt-get install -y google-chrome-stable && \

  # Virtual display
  apt-get install -y xvfb && \
  # OpenGL implementation for for Chrome
  apt-get install -y libosmesa6 && \
  # ImageMagick for taking screenshots
  apt-get install -y imagemagick && \
  # Link Mesa driver
  ln -s /usr/lib/x86_64-linux-gnu/libOSMesa.so.6 /opt/google/chrome/libosmesa.so && \

  # Make Xvfb daemon script executable
  chmod +x /etc/init.d/xvfb

ENV HOME /root
# Export the virtual display Xvfb creates
ENV DISPLAY :1

# Define default command.
CMD ["bash"]

xvfb

XVFB=/usr/bin/Xvfb
XVFBARGS=":1 -screen 0 1024x768x24 -ac +extension GLX +render -noreset"
PIDFILE=/var/run/xvfb.pid
case "$1" in
  start)
    echo -n "Starting virtual X frame buffer: Xvfb"
    start-stop-daemon --start --quiet --pidfile $PIDFILE --make-pidfile --background --exec $XVFB -- $XVFBARGS
    echo "."
    ;;
  stop)
    echo -n "Stopping virtual X frame buffer: Xvfb"
    start-stop-daemon --stop --quiet --pidfile $PIDFILE
    echo "."
    ;;
  restart)
    $0 stop
    $0 start
    ;;
  *)
        echo "Usage: /etc/init.d/xvfb {start|stop|restart}"
        exit 1
esac

exit 0