The safest, fastest way to build and deploy dynamic applications.


With bundler:

# In your Gemfile
gem 'fastball', require: false

# In your terminal
bundle install

As a gem:

gem install fastball

In your Rakefile:

require 'fastball/tasks'

Verify installation:

$ rake -T fastball
rake fastball:config  # generate environment specific configuration files


See Fastball::Config for documentation and examples of using Fastball to generate config files.


Fastball is a young, opionated project with more features under active development.

  • CLI command to vendor fastball in an application so production servers do not require the fastball gem to function
  • Packaging dynamic applications into a build archive with all dependencies vendored (except for the interpreter)
  • Deploying build archives into a designated deployment environment


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at[USERNAME]/fastball.


The gem is available as open source under the terms of the MIT License.