Example Dockerfile for Ruby app (with Bundler + Git clone)

Dockerfile

FROM ubuntu

MAINTAINER Callum Jones <[email protected]>

RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
RUN apt-get -y update

# prep for downloading and installing ruby
RUN mkdir -p /temp/ruby
RUN apt-get install -y build-essential libssl-dev zlib1g-dev
RUN apt-get install -y wget git openssh-client libpq-dev

# grab ruby
RUN wget -q http://cache.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p451.tar.gz -O /temp/ruby.tgz

# extract it
RUN tar xvfz /temp/ruby.tgz --strip=1 -C /temp/ruby > /dev/null

# op here
WORKDIR /temp/ruby

# configure with out rdoc (production right?) and make
RUN ./configure --disable-install-rdoc > /dev/null
RUN make > /dev/null
RUN make install > /dev/null

RUN gem install bundler

# in the directory of this Dockerfile have a ssh folder that contains id_rsa & id_rsa.pub
ADD ssh/ /ssh

# setup global id_rsa and disable the yes/no prompt for GitHub
RUN echo "    IdentityFile /ssh/id_rsa" >> /etc/ssh/ssh_config
RUN echo "    Host github.com"
RUN echo "        StrictHostKeyChecking=no" >> /etc/ssh/ssh_config

# create the app directory, do the hard work now to decrease bootup times
RUN mkdir /myapp
RUN git clone [email protected]:callumj/myapp.git /myapp
WORKDIR /myapp
RUN bundle install

# create the app script that just brings everything up-to-date
RUN echo "cd /myapp" > /boot.sh
RUN echo "git pull origin master" >> /boot.sh
RUN echo "bundle install" >> /boot.sh

# for some this might be rails s or a rake task
RUN echo "RAILS_ENV=production clockwork clockwork.rb" >> /boot.sh
RUN chmod +x /boot.sh

# boot.sh will be our execution
WORKDIR /
CMD /bin/sh -c "./boot.sh"