= Tips for using \Rainbows! with Sandbox installation tools Most {tips for Unicorn}[http://unicorn.bogomips.org/Sandbox.html] for Bundler and Isolate apply to \Rainbows! as well. == TLDR (Bundler) You need to add "rainbows" to your Gemfile for Bundler and start \Rainbows! with: bundle exec rainbows ... == TLDR (Isolate) Isolate "rainbows" and execute the "rainbows" launcher in your isolated GEM_PATH: $APP_ROOT/tmp/ruby-1.9/bin/rainbows ... == Explanation Due to the variety of potential dependencies, \Rainbows! lazy loads many of its internals, often after the application itself is loaded. This results in more potential to interact badly with sandbox tools that modify the gem environment.