merge: @PirosB3 and @pjz suggested using pjzz/phusion-baseimage as the base image for docker

See http://phusion.github.io/baseimage-docker/ for why the stock Ubuntu
image from Docker is not good enough for a complex system.

Thanks to @pjz for updating the base image for Ubuntu 14.04 and starting
the service scripts.

see #16; merges #49

Dockerfile

@@ -5,17 +5,30 @@
 # To build the image:
 # sudo docker.io build -t box .
 
-# Run your container the first time with an interactive console so you can
-# create your first mail account.
-# sudo docker.io run -i -t box
-
-# Then run it in the background and expose all of the ports so that the *host* acts as a Mail-in-a-Box:
-# (the SSH port is only available locally, but other ports are exposed publicly and must be available
-# otherwise the container won't start)
-# sudo docker.io run -d -p 22 -p 25:25 -p 53:53/udp -p 443:443 -p 587:587 -p 993:993 box
-
-FROM ubuntu:14.04
+# Run your container.
+#  -i -t: creates an interactive console so you can poke around (CTRL+D will terminate the container)
+#  -p ...: Maps container ports to host ports so that the host begins acting as a Mail-in-a-Box.
+# sudo docker.io run -i -t -p 22 -p 25:25 -p 53:53/udp -p 443:443 -p 587:587 -p 993:993 box
+
+###########################################
+
+# We need a better starting image than docker's ubuntu image because that
+# base image doesn't provide enough to run most Ubuntu services. See
+# http://phusion.github.io/baseimage-docker/ for an explanation. They
+# provide a better image, but their latest is for an earlier Ubuntu 
+# version. When they get to Ubuntu 14.04 we'll want to use:
+#
+# FROM phusion/baseimage:<version-based-on-14.04>
+#
+# Until then, use an upgraded image provided by @pjz, based on his
+# PR: https://github.com/phusion/baseimage-docker/pull/64
+
+FROM pjzz/phusion-baseimage:0.9.10
+	# based originally on ubuntu:14.04
+
+# Dockerfile metadata.
 MAINTAINER Joshua Tauberer (http://razor.occams.info)
+EXPOSE 22 25 53 443 587 993
 
 # We can't know these values ahead of time, so set them to something
 # obviously local. The start.sh script will need to be run again once
@@ -26,10 +39,11 @@ ENV PUBLIC_IP 192.168.200.1
 
 # Docker-specific Mail-in-a-Box configuration.
 ENV DISABLE_FIREWALL 1
+ENV NO_RESTART_SERVICES 1
 
 # Our install will fail if SSH is installed and allows password-based authentication.
-RUN DEBIAN_FRONTEND=noninteractive apt-get install -qq -y openssh-server
-RUN sed -i /etc/ssh/sshd_config -e "s/^#PasswordAuthentication yes/PasswordAuthentication no/g"
+# The base image already installs openssh-server. Just edit its configuration.
+RUN sed -i -e "s/^#*\s*PasswordAuthentication \(yes\|no\)/PasswordAuthentication no/g" /etc/ssh/sshd_config
 
 # Add this repo into the image so we have the configuration scripts.
 ADD scripts /usr/local/mailinabox/scripts
@@ -37,9 +51,12 @@ ADD conf /usr/local/mailinabox/conf
 ADD tools /usr/local/mailinabox/tools
 
 # Start the configuration.
-RUN cd /usr/local/mailinabox; scripts/start.sh
+RUN cd /usr/local/mailinabox && scripts/start.sh
 
-# How the instance is launched.
+# Configure services for docker.
 ADD containers/docker /usr/local/mailinabox/containers/docker
-CMD bash /usr/local/mailinabox/containers/docker/start_services.sh
-EXPOSE 22 25 53 443 587 993
+RUN /usr/local/mailinabox/containers/docker/setup_services.sh
+RUN ln -s /usr/local/mailinabox/containers/docker/container_start.sh /etc/my_init.d/99-mailinabox.sh
+
+# Start bash so we can poke around.
+CMD ["/sbin/my_init", "--", "bash"]

containers/docker/start_services.sh → containers/docker/container_start.sh

@@ -15,36 +15,10 @@ if grep "^PUBLIC_IP=192.168.200.1" /etc/mailinabox.conf > /dev/null; then
   export PUBLIC_HOSTNAME=`host $PUBLIC_IP | sed -e "s/.* //" | sed -e "s/\.$//"`
   echo Your hostname is $PUBLIC_HOSTNAME.
 
-  # Start configuration again.
+  # Start configuration again. Hide the terminal. The system services
+  # have not been started yet, so we can't ask the user to create an
+  # account yet.
   cd /usr/local/mailinabox
-  scripts/start.sh
+  scripts/start.sh < /dev/null
 fi
 
-echo "Starting Mail-in-a-Box services..."
-
-service nsd start
-service postfix start
-dovecot # it's integration with Upstart doesn't work in docker
-service opendkim start
-service nginx start
-service php-fastcgi start
-
-if [ -t 0 ]
-then
-  # This is an interactive shell. You get a command prompt within
-  # the container.
-  #
-  # You get here by running 'docker run -i -t'.
-
-  echo "Welcome to your Mail-in-a-Box."
-  bash
-
-else
-  # This is a non-interactive shell. It loops forever to prevent
-  # the docker container from stopping.
-  #
-  # You get here by omitting '-t' from the docker run arguments.
-
-  echo "Your Mail-in-a-Box is running..."
-  while true; do sleep 10; done
-fi

containers/docker/setup_services.sh

+#!/bin/bash
+echo "Setting up Mail-in-a-Box services..."
+
+SERVICES="nsd postfix dovecot opendkim nginx php-fastcgi"
+
+for service in $SERVICES; do
+    mkdir -p /etc/service/$service
+done
+
+cat <<EORUN >/etc/service/nsd/run
+#!/bin/sh
+exec /usr/sbin/nsd -d
+EORUN
+
+cat <<EORUN >/etc/service/postfix/run
+#!/bin/sh
+# from http://smarden.org/runit/runscripts.html#postfix
+exec 1>&2
+  
+daemon_directory=/usr/lib/postfix \
+  command_directory=/usr/sbin \
+  config_directory=/etc/postfix \
+  queue_directory=/var/spool/postfix \
+  mail_owner=postfix \
+  setgid_group=postdrop \
+  /etc/postfix/postfix-script check || exit 1
+   
+exec /usr/lib/postfix/master
+EORUN
+
+cat <<EORUN >/etc/service/dovecot/run
+#!/bin/sh
+exec dovecot -F
+EORUN
+
+cat <<EORUN >/etc/service/opendkim/run
+#!/bin/sh
+exec opendkim -f -x /etc/opendkim.conf -u opendkim -P /var/run/opendkim/opendkim.pid 
+EORUN
+
+echo "daemon off;" >> /etc/nginx/nginx.conf
+cat <<EORUN >/etc/service/nginx/run
+#!/bin/sh
+exec nginx
+EORUN
+
+cat <<EORUN >/etc/service/php-fastcgi/run
+#!/bin/bash
+export PHP_FCGI_CHILDREN=4 PHP_FCGI_MAX_REQUESTS=1000
+exec /usr/bin/php-cgi -q -b /tmp/php-fastcgi.www-data.sock -c /etc/php5/cgi/php.ini 
+EORUN
+
+for service in $SERVICES; do
+    chmod a+x /etc/service/$service/run
+done
+
+echo "Your Mail-in-a-Box services are configured."
+

scripts/start.sh

@@ -52,6 +52,17 @@ PUBLIC_HOSTNAME=$PUBLIC_HOSTNAME
 PUBLIC_IP=$PUBLIC_IP
 EOF
 
+# For docker, we don't want any of our scripts to start daemons.
+# Mask the 'service' program by defining a function of the same name
+# so that whenever we try to restart a service we just silently do
+# nothing.
+if [ "$NO_RESTART_SERVICES" == "1" ]; then
+	function service {
+		# we could output some status, but it's not important
+		echo skipping service $@ > /dev/null;
+	}
+fi
+
 # Start service configuration.
 . scripts/system.sh
 . scripts/dns.sh

scripts/system.sh

@@ -2,8 +2,8 @@ source scripts/functions.sh # load our functions
 
 # Base system configuration.
 
-apt-get -q -q update
-apt-get -q -y upgrade
+apt-get -qq update
+apt-get -qq -y upgrade
 
 # Install openssh-server to ensure that the end result is consistent across all Mail-in-a-Boxes.
 apt_install openssh-server