Dockerfile-App

FROM my/base

VOLUME ["/app/vendor/cache"]

ADD ./docker /app/docker
RUN if [ -f /app/docker/setup.sh ]; then /app/docker/setup.sh; fi

ADD Gemfile /app/Gemfile
ADD Gemfile.lock /app/Gemfile.lock
RUN bundle install

ADD . /app
RUN PRECOMPILE=true \
    SECRET_KEY_BASE=ABCDEFGHIJKLMNOPQRSTUVWXYZ01234 \
    RAILS_ENV=production \
    bundle exec rake assets:precompile --trace

EXPOSE 3000

ENTRYPOINT ["/app/bin/entry"]

Dockerfile-Base

FROM ubuntu:14.04

RUN mkdir -p /build
WORKDIR /build
ADD . /build
RUN ./install_ruby.sh
RUN ./install_default_packages.sh
RUN ./install_bundler.sh

RUN mkdir -p /bundle
RUN mkdir -p /app

WORKDIR /app

entry

#!/bin/bash
if [ "$1" == "run_with_migration" ]; then
    bundle exec rake db:create db:migrate
    bundle exec rails s -b 0.0.0.0
fi

if [ "$1" == "run" ]; then
    bundle exec rails s -b 0.0.0.0
fi

if [ "$1" == "sleep" ]; then
    ruby -e 'while true; sleep 1; end'
fi

if [ "$1" == "be" ]; then
    bundle exec "${@:2}"
fi

filestructure

~/base
~/base/Dockerfile #Dockerfile-Base
~/base/install_ruby.sh
~/base/install_default_packages.sh
~/base/install_bundler.sh

~/rails_app #normal rails application
~/rails_app/bin/entry #make sure to chmod +x the entry file
~/rails_app/Dockerfile #Dockerfile-App

install_bundler.sh

#!/bin/bash

echo 'gem: --no-ri --no-rdoc' > ~/.gemrc
gem install bundler -v 1.10.3
bundle config --global path /bundle
bundle config --global --jobs 4

install_default_packages.sh

#!/bin/bash

set -e

apt-get -y install build-essential git libpq-dev libcurl3 libcurl3-gnutls libcurl4-openssl-dev nodejs htop vim curl

install_ruby.sh

#!/bin/bash

set -e

apt-get -y update
apt-get -y install python-software-properties
apt-get -y install software-properties-common
apt-add-repository -y ppa:brightbox/ruby-ng-experimental
apt-get -y update

apt-get -y install ruby2.1 ruby2.1-dev