[Postfix] Do not keep persistent logs in a container

data/Dockerfiles/postfix/Dockerfile

@@ -25,14 +25,13 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 	syslog-ng \
 	syslog-ng-core \
 	syslog-ng-mod-redis \
-	&& rm -rf /var/lib/apt/lists/*
+	&& rm -rf /var/lib/apt/lists/* \
+	&& touch /etc/default/locale
 
 RUN addgroup --system --gid 600 zeyple
 RUN adduser --system --home /var/lib/zeyple --no-create-home --uid 600 --gid 600 --disabled-login zeyple
 RUN touch /var/log/zeyple.log && chown zeyple: /var/log/zeyple.log
 
-RUN touch /etc/default/locale
-
 COPY zeyple.py /usr/local/bin/zeyple.py
 COPY zeyple.conf /etc/zeyple.conf
 COPY supervisord.conf /etc/supervisor/supervisord.conf

data/Dockerfiles/postfix/supervisord.conf

@@ -3,19 +3,16 @@ nodaemon=true
 
 [program:syslog-ng]
 command=/usr/sbin/syslog-ng --foreground  --no-caps
-redirect_stderr=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
 autostart=true
-stdout_syslog=true
 
 [program:postfix]
 command=/opt/postfix.sh
 autorestart=true
 
-[program:postfix-maillog]
-command=/bin/tail -f /var/log/zeyple.log /var/log/combined.log
-stdout_logfile=/dev/stdout
-stdout_logfile_maxbytes=0
-
 [unix_http_server]
 file=/var/tmp/supervisord.sock  
 chmod=0770  

data/Dockerfiles/postfix/syslog-ng.conf

@@ -13,9 +13,8 @@ source s_src {
   unix-stream("/dev/log");
   internal();
 };
-
-destination d_combined { file("/var/log/combined.log"); };
-destination d_redis_persistent_log {
+destination d_stdout { pipe("/dev/stdout"); };
+destination d_redis_ui_log {
   redis(
     host("redis-mailcow")
     persist-name("redis1")
@@ -34,8 +33,8 @@ destination d_redis_f2b_channel {
 filter f_mail { facility(mail); };
 log {
   source(s_src);
-  destination(d_combined);
+  destination(d_stdout);
   filter(f_mail);
-  destination(d_redis_persistent_log);
+  destination(d_redis_ui_log);
   destination(d_redis_f2b_channel);
 };

data/Dockerfiles/postfix/zeyple.conf

@@ -1,5 +1,5 @@
 [zeyple]
-log_file = /var/log/zeyple.log
+log_file = /dev/null
 
 [gpg]
 home = /var/lib/zeyple/keys