Ruby 1.9.3 Docker Image

A Docker image that contains the latest versions of RubyGems, Bundler, etc that are compatible with Ruby 1.9.3. So instead of having to create Dockerfiles that looked like:

FROM ruby:1.9.3

# The Debian Jessie APT packages have been archived.  Update where to
# find the packages.  If you don't do this you will get an error message
# like:
#
#  W: Failed to fetch http://http.debian.net/debian/dists/jessie-updates/InRelease
#
RUN sed -i '/jessie-updates/d' /etc/apt/sources.list

# Install stuff.  Currently just the build essentials.
RUN apt-get update -qq && apt-get install -y build-essential

# Working folder.
RUN mkdir /app
WORKDIR /app
COPY . .

# Install Gems.  Use Bundler 1.17.3 as 2+ does not work with
# Ruby 1.9.3.  Also update the rubygems to prevent frozen string
# errors.  Rubygems 2.7.8 is the latest version to support Ruby 1.9.3.
RUN gem install rubygems-update -v 2.7.8
RUN update_rubygems
RUN gem install bundler -v 1.17.3
RUN bundle install

The files now look like:

FROM corgibytes/ruby-1.9.3:1.0.1

# Working folder.
RUN mkdir /app
WORKDIR /app
COPY . .

# Install Gems.
RUN bundle install

Getting the Image

You can find the image on DockerHub here. To get the latest version, which is not guaranteed to be stable:

docker pull corgibytes/ruby-1.9.3

To get a specific version, which is stable:

docker pull corgibytes/ruby-1.9.3:<version>

For example:

docker pull corgibytes/ruby-1.9.3:1.0.0

Example Dockerfile and Compose to run a Rails app that uses Ruby 1.9.3:

# Dockerfile
FROM corgibytes/ruby-1.9.3:1.0.0`

# Working folder.
RUN mkdir /app
WORKDIR /app
COPY . .

# Install Gems.
RUN bundle install

# docker-compose.yml
version: '3.7'
services:
  web:
    build: .
    command: bundle exec rails s -p 3000 -b '0.0.0.0'
    entrypoint: ./docker-entrypoint.sh
    volumes:
      - .:/app
      - bundler-data:/usr/local/bundle
    ports:
      - "3000:3000"
    depends_on:
      - db
      
  db: 
    image: postgres:9.6
    ports:
      - "5432:5432"
    environment:
      POSTGRES_PASSWORD: password1234
    volumes:
      - db-data:/var/lib/postgresql/data

volumes:
  db-data:
  bundler-data:

# docker-entrypoint.sh
#!/bin/sh

rm -f tmp/pids/server.pid
exec "$@"

Versioning

This image is setup using DockerHub's automate builds. It will build on every commit to master and tag it as latest. It will build also build on every tag that has the format v.#.#.# and tag the build as #.#.#. For example if a release is tagged as v.1.0.0 a DockerHub image will be created with the tag 1.0.0.

The tagged versions are stable where as the latest version is not guaranteed to be stable.

You can find a full list of the built tags on DockerHub.

Testing the Image

When making changes to the image you can test you changes by running the following command in the root of the repository:

docker build .

Contributing

If you have any questions, notice a bug, or have a suggestion/enhancment please let me know by opening issue or pull request.

Acknowledgements