Refactored alpine-postfix to include monit

Dockerfile

@@ -1,10 +1,9 @@
-FROM alpine
+FROM rawmind/alpine-monit:0.5.20-2
+MAINTAINER Fabio Rauber <fabiorauber@gmail.com>
 
 RUN apk add --no-cache bash postfix postfix-pcre rsyslog
 
 COPY conf /etc/postfix
 COPY rsyslog.conf /etc/rsyslog.conf
 
-COPY start.sh /start.sh
-
-CMD ["/start.sh"]
+COPY monit-service.conf /opt/monit/etc/conf.d 

conf/postfix-service.sh

@@ -0,0 +1,75 @@
+#!/bin/bash
+
+function log {
+  echo `date` $ME - $@
+}
+
+function serviceConf {
+  # Substitute configuration
+  for VARIABLE in `env | cut -f1 -d=`; do
+    sed -i "s={{ $VARIABLE }}=${!VARIABLE}=g" /etc/postfix/*.cf
+  done
+
+  # Override Postfix configuration
+  if [ -f /overrides/postfix.cf ]; then
+    while read line; do
+      postconf -e "$line"
+    done < /overrides/postfix.cf
+    echo "Loaded '/overrides/postfix.cf'"
+  else
+    echo "No extra postfix settings loaded because optional '/overrides/postfix.cf' not provided."
+  fi
+
+  # Include table-map files
+  if ls -A /overrides/*.map 1> /dev/null 2>&1; then
+    cp /overrides/*.map /etc/postfix/
+    postmap /etc/postfix/*.map
+    rm /etc/postfix/*.map
+    chown root:root /etc/postfix/*.db
+    chmod 0600 /etc/postfix/*.db
+    echo "Loaded 'map files'"
+  else
+    echo "No extra map files loaded because optional '/overrides/*.map' not provided."
+  fi
+}
+
+function serviceStart {
+  serviceConf
+  # Actually run Postfix
+  log "[ Starting Postfix... ]"
+  rm -f /var/run/rsyslogd.pid
+  nohup /usr/lib/postfix/master &
+  echo $! > /var/run/postfix.pid
+  nohup rsyslogd -n &
+}
+
+function serviceStop {
+  log "[ Stopping Postfix... ]"
+  kill `cat /var/run/postfix.pid`
+}
+
+function serviceRestart {
+  log "[ Restarting Postfix... ]"
+  serviceStop
+  serviceStart
+  /opt/monit/bin/monit reload
+}
+
+export DOMAIN=${DOMAIN:-"localhost"}
+export MESSAGE_SIZE_LIMIT=${MESSAGE_SIZE_LIMIT:-"50000000"}
+export RELAYNETS=${RELAYNETS:-""}
+export RELAYHOST=${RELAYHOST:-""}
+
+case "$1" in
+  "start")
+    serviceStart &>> /proc/1/fd/1
+  ;;
+  "stop")
+    serviceStop &>> /proc/1/fd/1
+  ;;
+  "restart")
+    serviceRestart &>> /proc/1/fd/1
+  ;;
+  *) echo "Usage: $0 restart|start|stop"
+  ;;
+esac

monit-service.conf

@@ -0,0 +1,4 @@
+check process master with pidfile /var/run/postfix.pid
+  start program = "/etc/postfix/postfix-service.sh start"
+  stop program = "/etc/postfix/postfix-service.sh stop"
+  if failed port 25 type tcp for 5 cycles then exec "/opt/monit/bin/monit quit"

start.sh

@@ -1,33 +0,0 @@
-#!/bin/bash
-
-# Substitute configuration
-for VARIABLE in `env | cut -f1 -d=`; do
-  sed -i "s={{ $VARIABLE }}=${!VARIABLE}=g" /etc/postfix/*.cf
-done
-
-# Override Postfix configuration
-if [ -f /overrides/postfix.cf ]; then
-  while read line; do
-    postconf -e "$line"
-  done < /overrides/postfix.cf
-  echo "Loaded '/overrides/postfix.cf'"
-else
-  echo "No extra postfix settings loaded because optional '/overrides/postfix.cf' not provided."
-fi
-
-# Include table-map files
-if ls -A /overrides/*.map 1> /dev/null 2>&1; then
-  cp /overrides/*.map /etc/postfix/
-  postmap /etc/postfix/*.map
-  rm /etc/postfix/*.map
-  chown root:root /etc/postfix/*.db
-  chmod 0600 /etc/postfix/*.db
-  echo "Loaded 'map files'"
-else
-  echo "No extra map files loaded because optional '/overrides/*.map' not provided."
-fi
-
-# Actually run Postfix
-rm -f /var/run/rsyslogd.pid
-/usr/lib/postfix/master &
-rsyslogd -n