Ruby Docker image

The smallest Docker image with Ruby, is based on Alpine Linux image, which is only a 5MB image. It does only have ruby and bundler (except image with tiny tag).

Total size of this image is only:

• Github link
• Docker hub link

Support

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

Tags

Tags referring Alpine ruby version, not ruby version.

glibc-latest is an version that contains glibc to enable proprietary projects compiled against glibc and based on latest frolvlad/alpine-glibc.

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!

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