first commit

Dockerfile

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+FROM alpine:3.4
+MAINTAINER Andrey Arapov <andrey.arapov@nixaid.com>
+
+RUN echo '@testing http://nl.alpinelinux.org/alpine/edge/testing' |tee -a /etc/apk/repositories && \
+    apk update && \
+    apk upgrade && \
+    apk add tzdata rsyslog postfix runit@testing
+
+# tzdata - so that TZ environment variable gets processed
+# rsyslog - to log postfix service into /var/log/maillog file
+
+# Not in use currently:
+# - ca-certificates
+# - coreutils
+# - bind-tools
+
+COPY service /etc/service/
+ENTRYPOINT runsvdir -P /etc/service

service/postfix/run

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+#!/bin/sh
+
+# WORKAROUND:
+#   postfix has to be aware of the DNS servers
+#   without this workaround it uses 127.0.0.1:53 for some unknown (yet) reason...
+mkdir -v /var/spool/postfix/etc
+cp -v /etc/resolv.conf /var/spool/postfix/etc
+
+command_directory=$(postconf -h command_directory)
+daemon_directory=$($command_directory/postconf -h daemon_directory)
+
+# make consistency check
+$command_directory/postfix check 2>&1
+
+# run Postfix
+exec $daemon_directory/master 2>&1

service/rsyslogd/log/run

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+#!/bin/sh
+touch /var/log/maillog
+exec tail -f /var/log/maillog 2>&1

service/rsyslogd/run

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+#!/bin/sh
+touch /var/log/maillog
+exec /usr/sbin/rsyslogd -n 2>&1

start.sh

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+#!/bin/bash
+
+PROJ=mail
+APP=${PWD##*/}
+TZ=Europe/Prague
+
+sudo docker build -t $PROJ/$APP .
+sudo docker rm -f $APP
+sudo docker run -d \
+	--restart=always \
+	-h $(hostname -f) \
+	--name $APP \
+	--net bridge \
+	-p "25:25/tcp" \
+	-p "587:587/tcp" \
+	-e TZ=$TZ \
+	-v $PWD/letsencrypt:/etc/letsencrypt:ro \
+	-v $PWD/postfix/main.cf:/etc/postfix/main.cf:ro \
+	-v $PWD/postfix/master.cf:/etc/postfix/master.cf:ro \
+	$PROJ/$APP