- Remove temporary files and APT's cache, reduce image size.

FROM debian:jessie

ENV DEBIAN_FRONTEND noninteractive

RUN apt-get update && \

    apt-get install -y unbound unbound-host dnsutils dma bsd-mailx

    apt-get install -y unbound unbound-host dnsutils dma bsd-mailx && \

    rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/* /var/cache/apt/archives/*

COPY entrypoint.sh /entrypoint.sh

ENTRYPOINT ["/entrypoint.sh"]

CMD ["/bin/bash", "--login"]