capistrano-unicorn-nginx

https://github.com/bruno-/capistrano-unicorn-nginx

Capistrano tasks for automatic and sensible unicorn + nginx configuraion. Enables zero downtime deployments of Rails applications. Configs can be copied to the application using generators and easily customized. Works *only* with Capistrano 3+. For Capistrano 2 try version 0.0.8 of this gem: http://rubygems.org/gems/capistrano-nginx-unicorn