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Deploying bundled applications

Before deploying an app that uses Bundler, Add your Gemfile and Gemfile.lock to source control, but ignore the .bundle folder, which is specific to each machine.
$ echo ".bundle" >> .gitignore
$ git add Gemfile Gemfile.lock .gitignore
$ git commit -m "Add Bundler support"
Once you have done that, there are two ways to deploy using Bundler: manually or automatically.

Manual deployment

In your deploy script, after updating to the latest code, install your bundle to the vendor/bundle directory, ensuring all your dependencies are met.
$ bundle install --deployment

Start your application servers as usual, and your application will use your bundled environment with the exact same gems you use in development.

If you have run bundle package, the cached gems will be used automatically.

Learn More: Packing

Automatic deployment with Capistrano

To pull in the Bundler Cap task, just add this to your deploy.rb file:
require "bundler/capistrano"
That's it! Running cap deploy will now automatically run bundle install on the remote server with deployment-friendly options. A list of options that can be changed is available in the help for the cap task. To see it, run cap -e bundle:install.

Automatic deployment with Vlad

There is a default Vlad task available. To make it available, add this line to the Vlad deploy.rb.
require "bundler/vlad"
Once you have done that, the vlad:bundle:install task will be available for use. Make sure it is run as part of your deploy. For example:
task "vlad:deploy" => %w[
  vlad:update vlad:bundle:install vlad:start_app vlad:cleanup
]

After deploying

Make sure to use bundle exec to run any executables from gems in the bundle
$ bundle exec rake db:setup
Alternatively, you can use the --binstubs option on the install command to generate executable binaries that can be used instead of bundle exec.
Learn More: Executables

Heroku

When you deploy to Heroku, Bundler will be run automatically as long as a Gemfile is present. If you check in your Gemfile.lock, Heroku will run `bundle install --deployment`. If you want to exclude certain groups using the --without option, you need to use `heroku config`.
$ heroku config:add BUNDLE_WITHOUT="test development" --app app_name
Heroku Bundler Documentation