Run headless wkhtmltopdf inside Docker container

Dockerfile

# wkhtmltopdf from: http://wkhtmltopdf.org/downloads.html
FROM centos:7
MAINTAINER Eric Siegel <nticompass@gmail.com>

# Upgrade packages & repo
RUN yum -y update
# wkhtmltopdf's dependencies
RUN yum -y install zlib fontconfig freetype libX11 libXext libXrender

# Download x64 static build of wkhtmltox (with patched QT)
ADD http://download.gna.org/wkhtmltopdf/0.12/0.12.3/wkhtmltox-0.12.3_linux-generic-amd64.tar.xz /tmp/wkhtmltox.tar.xz

# Extract the archive
RUN tar -C /opt -xvf /tmp/wkhtmltox.tar.xz

# Run wkhtmltopdf and accept command line args
WORKDIR /opt/wkhtmltox/bin
ENTRYPOINT ["./wkhtmltopdf"]