refs #28587 Configure for generic usage of postfix, not only as relay; use…

refs #28587 Configure for generic usage of postfix, not only as relay; use centos6 to start postfix service

Dockerfile

-FROM layerworx/centos
+FROM centos:6
 
 RUN yum -y install postfix mailx cyrus-sasl cyrus-sasl-plain python-setuptools python-pip rsyslog
 
@@ -6,4 +6,4 @@ VOLUME ["/var/log"]
 
 ADD postfix.sh /postfix.sh
 
-CMD ["sh", "-c", "./postfix.sh"]
+CMD ["sh", "-c", "/postfix.sh"]
\ No newline at end of file

README.md

@@ -4,9 +4,9 @@ Available tags: [latest](https://github.com/eea/eea.docker.postfix/blob/master/D
 
 This image is a CentOS 6 container running postfix preconfigured for SMTP relay authentication. It runs as an open relay mail server inside the Docker Containers internal network, so it can be used by any container to send emails through the remote relay.
 
-The relay is set in the environment variable: `MTP_RELAY`.
+The hostname of the postfix server is set in the environment variable `MTP_HOST` and is mandatory. Postfix will run as an open relay server only if the variables below are also set.
 
-The hostname of the postfix server is set in: `MTP_HOST`.
+The relay is set in `MTP_RELAY` and the port in `MTP_PORT`.
 
 The `.secrets` file should be used as a runtime environment variables, to set the user and password required for SMTP authentication by the `MTP_RELAY`:
 

example/Dockerfile

-FROM layerworx/centos
+FROM centos:6
 
 RUN yum install -y mailx ssmtp
 

postfix.sh

@@ -2,20 +2,25 @@
 
 # Set up user
 function setup_conf_and_secret {
-    postconf -e "myhostname = $MTP_HOST"
     postconf -e "relayhost = [$MTP_RELAY]:$MTP_PORT"
     postconf -e 'smtp_sasl_auth_enable = yes'
     postconf -e 'smtp_sasl_password_maps = hash:/etc/postfix/relay_passwd'
     postconf -e 'smtp_sasl_security_options = noanonymous'
     postconf -e 'smtp_tls_security_level = may'
     postconf -e 'mynetworks = 127.0.0.0/8 172.17.0.0/16'
-    postconf -e 'inet_interfaces = all'
 
     echo "$MTP_RELAY   $MTP_USER:$MTP_PASS" > /etc/postfix/relay_passwd
     postmap /etc/postfix/relay_passwd
 }
 
-setup_conf_and_secret
+postconf -e "myhostname = $MTP_HOST"
+postconf -e 'inet_interfaces = all'
+
+if [ ! -z "$MTP_RELAY" -a ! -z "$MTP_PORT" -a ! -z "$MTP_USER" -a ! -z "$MTP_PASS" ]; then
+    setup_conf_and_secret
+else
+    postconf -e 'mynetworks = 127.0.0.1/32 192.168.0.0/16 172.16.0.0/12 10.0.0.0/8'
+fi
 
 service rsyslog start
 service postfix start