Dockermail is now modular

opendkim/Dockerfile

@@ -9,10 +9,15 @@ RUN apt-get update && apt-get install -y \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-# configure settings script
+# Nice place for your settings
 VOLUME ["/mail_settings"]
-COPY boot /boot
+
+# Configure boot script
+COPY boot /
 RUN chmod 755 /boot
 
-# start necessary services for operation (dovecot -F starts dovecot in the foreground to prevent container exit)
-ENTRYPOINT /boot; service rsyslog start; opendkim -f
+ENV OPEN_DKIM true
+ENV OPEN_DKIM_PORT_8891_ADDR inet:8891
+
+EXPOSE 8891
+ENTRYPOINT ./boot; service rsyslog start; opendkim -f -p $OPEN_DKIM_PORT_8891_ADDR

opendkim/README.md

@@ -0,0 +1,18 @@
+Dockermail - OpenDKIM
+===
+Once configured and linked to the `email_core`, this image will provide DKIM singing for your mail.
+Please see http://www.opendkim.org/ for more information on OpenDKIM.
+
+### Configuration
+To get going you need to generate a key and set up your domain records (see step 5).
+
+This images uses settings files in an attached volume to configure the container on boot.
+You can place these in the same folder as the `email_core`'s settings for easy administration.
+
+  * `opendkim.conf`
+  You will find this file in the './config', change `Domain` to your own domain.
+
+  * `mail.private`
+  You will need to generate this private key file and use the public key in your domain's DNS setup.
+
+See https://help.ubuntu.com/community/Postfix/DKIM for info on generating keys and setting up your domain.

opendkim/boot

@@ -1,5 +1,5 @@
 # Copy OpenDKIM config
 cp /mail_settings/opendkim.conf /etc/opendkim.conf
 cp /mail_settings/mail.private /etc/dkim.key
-chown opendkim:opendkim /etc/dkim.key
+chown root:root /etc/dkim.key
 chmod 600 /etc/dkim.key

opendkim/config/opendkim.conf

@@ -14,7 +14,7 @@ Syslog                  yes
 # Sign for example.com with key in /etc/mail/dkim.key using
 # selector '2007' (e.g. 2007._domainkey.example.com)
 Domain                  example.com
-KeyFile                 /etc/dkim.key # See bellow how to generate and set up the key
+KeyFile                 /etc/dkim.key
 Selector                mail
 
 # Common settings. See dkim-filter.conf(5) for more information.