Dockerfile for Rails

bin-start.sh

#!/bin/bash

bundle exec rails db:migrate
bundle exec rails db:seed
bundle exec rails server -p 3000 -b 0.0.0.0

Dockerfile

FROM ruby:2.3.0

# see update.sh for why all "apt-get install"s have to stay as one long line
RUN apt-get update && apt-get install -y nodejs --no-install-recommends && rm -rf /var/lib/apt/lists/*

# see http://guides.rubyonrails.org/command_line.html#rails-dbconsole
RUN apt-get update && apt-get install -y mysql-client postgresql-client sqlite3 --no-install-recommends && rm -rf /var/lib/apt/lists/*

ENV RAILS_VERSION 5.0.0.beta3
RUN gem install rails --version "$RAILS_VERSION"

RUN mkdir /app

WORKDIR /tmp
COPY Gemfile Gemfile
COPY Gemfile.lock Gemfile.lock
RUN bundle install --jobs 20 --retry 5 --without development test

ENV RAILS_ENV production
ENV RACK_ENV production
ENV SECRET_KEY_BASE --SET-YOUR-SECRET-KEY--

# ADD . /app
WORKDIR /app
COPY . ./

RUN bundle exec rails assets:precompile

EXPOSE 3000

ENV RAILS_SERVE_STATIC_FILES 1

# Run it
ENTRYPOINT ["bin/start.sh"]