Ruby Docker image

The smallest Docker image with Ruby.

Total size of this image is only:

• Github link
• Docker hub link

This image is based on Alpine Linux image, which is only a 5MB image.

Support

This is minimal image with only necessary packages, to keep your app working in production. Image build by using only official applications from Alpine linux, and supported AS IS.

For development purposes it's better to use official ruby image based on debian or same Alpine linux, one of them:

• docker pull ruby:alpine
• docker pull ruby:slim
• docker pull ruby:latest

Usage Example

Check ruby version:

docker run -ti --rm andrius/alpine-ruby:latest ruby -v

Hello, world:

docker run -ti --rm andrius/alpine-ruby ruby -e "puts 'Hello, world!'"

Once you have run this command you will get printed 'Hello World' from Ruby!

What's included

• bundler
• foreman

Development packages

Sometimes you could need to install various gems, where development packages is mandatory.

Usually it's enough to install following packages:

apk add --update ruby-dev build-base \
  libxml2-dev libxslt-dev pcre-dev libffi-dev \
  mariadb-dev postgresql-dev

About nokogiri installation

In order to install nokogiri, you could use alpine's version:

apk add --update ruby-nokogiri

However you could need specific version or want to follow version from Gemfile, you could install it:

# installing *dev stuff
apk add --update ruby-dev build-base

bundle install
# or you could install gem directly
gem install nokogiri -- --use-system-libraries

# removing *dev stuff
apk del ruby-dev build-base