Base all on xenial to save some space loading chunks, clean-up images

data/Dockerfiles/postfix/Dockerfile

@@ -2,24 +2,31 @@ From ubuntu:xenial
 MAINTAINER Andre Peters <andre.peters@servercow.de>
 
 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 -y install supervisor \
+RUN apt-get install -y --no-install-recommends supervisor \
 	postfix \
 	sasl2-bin \
 	postfix \
 	postfix-mysql \
 	postfix-pcre \
-	rsyslog \
+	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
 
-RUN groupadd -g 5000 vmail
-RUN useradd -g vmail -u 5000 vmail -d /var/vmail
-
 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/*

data/Dockerfiles/postfix/supervisord.conf

@@ -1,11 +1,11 @@
 [supervisord]
 nodaemon=true
 
-[program:rsyslog]
-command=/usr/sbin/rsyslogd -n
-autostart=true
-autorestart=true
+[program:syslog-ng]
+command=/usr/sbin/syslog-ng --foreground  --no-caps
 redirect_stderr=true
+autostart=true
+stdout_syslog=true
 
 [program:postfix]
 command=/opt/postfix.sh