Dockerfile

FROM debian:jessie

ENV RUBY_MAJOR=1.9 RUBY_VERSION=1.9.3-p551 RUBYGEMS_VERSION=2.4.8

RUN echo 'install: --no-document\nupdate: --no-document' >> "$HOME/.gemrc"
RUN apt-get update \
	&& apt-get install -y --no-install-recommends \
		bzip2 \
		ca-certificates \
		curl \
		libffi-dev \
		libgdbm3 \
		libssl-dev \
		libyaml-dev \
		procps \
		zlib1g-dev \
	&& rm -rf /var/lib/apt/lists/*

RUN buildDeps=' \
		autoconf \
		bison \
		gcc \
		libbz2-dev \
		libgdbm-dev \
		libglib2.0-dev \
		libncurses-dev \
		libreadline-dev \
		libxml2-dev \
		libxslt-dev \
		make \
	' \
	&& set -x \
	&& apt-get update \
	&& apt-get install -y --no-install-recommends $buildDeps \
	&& rm -rf /var/lib/apt/lists/* \
	&& mkdir -p /usr/src/ruby \
	&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
		| tar -xjC /usr/src/ruby --strip-components=1 \
	&& cd /usr/src/ruby \
	&& autoconf \
	&& ./configure --disable-install-doc \
	&& make -j"$(nproc)" \
	&& make install \
	&& gem update --system $RUBYGEMS_VERSION \
	&& rm -r /usr/src/ruby \
    && cd / \
	&& apt-get purge -y --auto-remove $buildDeps

# install things globally, for great justice
ENV GEM_HOME /usr/local/bundle
ENV PATH $GEM_HOME/bin:$PATH

ENV BUNDLER_VERSION 1.10.6

RUN gem install bundler --version "$BUNDLER_VERSION" \
	&& bundle config --global path "$GEM_HOME" \
	&& bundle config --global bin "$GEM_HOME/bin"

# don't create ".bundle" in all our apps
ENV BUNDLE_APP_CONFIG $GEM_HOME

CMD [ "irb" ]