From ubuntu:xenial MAINTAINER Andre Peters ENV DEBIAN_FRONTEND noninteractive ENV LC_ALL C RUN dpkg-divert --local --rename --add /sbin/initctl \ && ln -sf /bin/true /sbin/initctl \ && dpkg-divert --local --rename --add /usr/bin/ischroot \ && ln -sf /bin/true /usr/bin/ischroot RUN apt-get update RUN apt-get install -y --no-install-recommends supervisor \ postfix \ sasl2-bin \ libsasl2-modules \ postfix \ postfix-mysql \ postfix-pcre \ syslog-ng \ syslog-ng-core \ ca-certificates RUN sed -i -E 's/^(\s*)system\(\);/\1unix-stream("\/dev\/log");/' /etc/syslog-ng/syslog-ng.conf COPY supervisord.conf /etc/supervisor/supervisord.conf COPY postfix.sh /opt/postfix.sh EXPOSE 588 CMD exec /usr/bin/supervisord -c /etc/supervisor/supervisord.conf RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*