Deploy Unicorn Apps with Capistrano

Minimal, annotated configuration files for zero-downtime Capistrano deployment of a Rack application served by Unicorn. Why? See GitHub's "Unicorn!" and "Deployment Script Spring Cleaning" blog posts.

The most important files:

• config/deploy.rb configures Capistrano to start and stop Unicorn master processes

• config/unicorn.rb puts pidfiles in the right places and sets a callback to QUIT Unicorn master processes running older releases of the codebase

• config/deployment_paths.rb ensures Capistrano and Unicorn look for important files in the same places

• etc/nginx.conf configures the NGINX server to proxy through the Unicorn socket for dynamic page requests