The bundler plugin installs ruby gem dependencies using bundler. This is required for deploying Rails apps. It also provides conveniences for using bundle exec.


Note that the settings listed here only take effect if you run the bundler:config task.

Name Purpose Default
bundler_config_path Location where the bundler:config task will write bundler’s configuration file ".bundle/config"
bundler_deployment Enables bundler’s deployment mode (strongly recommended) true
bundler_gemfile Optionally used to override the location of the Gemfile nil
bundler_ignore_messages Hide gem post-install messages during bundle install true
bundler_jobs Override bundler’s default (number of processors) amount of concurrency used when downloading/installing gems nil
bundler_path Directory where gems where be installed "%{shared_path}/bundle"
bundler_retry Number of times to retry installing a gem if it fails to download "3"
bundler_version The version of bundler to install, used by the bundler:upgrade_bundler task; if nil (the default), determine the version based on Gemfile.lock nil
bundler_without Array of Gemfile groups to exclude from installation ["development", "test"]



Installs the version of bundler specified by the :bundler_version setting, if specified. If :bundler_version is nil (the default), this task will automatically determine the version of bundler required by the app that is being deployed by looking at the BUNDLED WITH entry within the app’s Gemfile.lock. Bundler will be installed withing this command:

gem install bundler --conservative --no-document -v VERSION

bundler:upgrade_bundler is intended for use as a setup task. It should be run prior to bundler:install to ensure that the correct version bundler is present.


Writes a .bundle/config file with the configuration specified by the various :bundler_* tomo settings. This ensures that invocations of bundle check, bundle install, and most importantly bundle exec all consistently use the correct bundler configuration.

bundler:config is intended for use as a setup task. It should be run prior to bundler:install so that gems are installed in the proper location.


Runs bundle install to download and install all the dependencies specified by the Gemfile of the app that is being deployed. As a performance optimization, this task will run bundle check first to see if the app’s dependencies have already been installed. If so, bundle install is skipped.

bundler:install is intended for use as a deploy task. It should be run prior to any tasks that rely on gems.


Runs bundle clean to delete any previously installed gems that are no longer needed by the current version of the app. Cleaning is generally good practice to save disk space and speed up app launch time.

bundler:clean is intended for use as a deploy task. It should be run at the conclusion of the deploy after all other tasks.


These helper methods become available on instances of Remote when the bundler plugin is loaded. They accept the same options as Remote#run.

remote.bundle(*args, **options) → Tomo::Result

Runs bundle within release_path by default.

remote.bundle("exec", "rails", "console")
# $ cd /var/www/my-app/current && bundle exec rails console

remote.bundle?(*args, **options) → true or false

Same as bundle but returns true if the command succeeded, false otherwise.