A sample dockerfile

Dockerfile

FROM ubuntu-debootstrap:precise

# Install repo
RUN apt-get -qq update && \
    apt-get -qq install curl apt-transport-https --no-install-recommends && \
    curl ${REPO_KEY} | apt-key add - && \
    echo "deb ${REPO_URL} precise main" >> /etc/apt/sources.list && \
    rm -rf /var/lib/apt/lists/* && rm -rf /usr/share/man/* && rm -rf /usr/share/doc/*

# Install service
RUN apt-get -qq update && \
    apt-get -qq install ${PACKAGE_NAME} --no-install-recommends && \
    rm -rf /var/lib/apt/lists/* && rm -rf /usr/share/man/* && rm -rf /usr/share/doc/*

# Entrypoint
WORKDIR service-dir
ENTRYPOINT ["${PATH_TO_SERVICE}"]
EXPOSE ${SERVICE_PORT}