Getting Started with Capistrano
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The document provides a guide for setting up automated app deployment using Capistrano with Ruby on Rails through SSH, focusing on app structure and command execution. It includes example scripts for configuring deployment specifics, recommendations for server setup, and best practices like creating a dedicated deploy user and managing multi-stage deployments. Additional tips on cleaning up old releases and enhancing Capistrano with colors are also shared.
![Example Script
(Passenger)
namespace :deploy do
desc "Restarting mod_rails with restart.txt”
task :restart, :roles => :app, :except => { :no_release => true } do
run "touch #{current_path}/tmp/restart.txt”
end
[:start, :stop].each do |t|
desc "#{t} task is a no-op with mod_rails”
task t, :roles => :app do ; end
end
end](https://image.slidesharecdn.com/capistrano-gettingstarted-120712131542-phpapp01/85/Getting-Started-with-Capistrano-9-320.jpg)
Getting Started with Capistrano
- 1. Getting Started with Capistrano and Ruby on Rails
- 2. Automated App Deployment using ssh
- 3. Not for server configuration Use Chef or Puppet for that
- 4. Installation $ gem install capistrano Bundler: gem „capistrano‟
- 5. Capify your application $ capify .
- 6. Rails Directory Structure / |- public/ |- config/ - deploy.rb <--- Capistrano |- application/
- 7. Example Script set :application, "set your application name here” role :app, "your app-server here” role :web, "your web-server here” role :db, "your db-server here", :primary => true
- 8. Example Script (git) set :scm, :git set :repository, “username@hostname:myapp.git” set :branch, “master” set :deploy_via, :remote_cache
- 9. Example Script (Passenger) namespace :deploy do desc "Restarting mod_rails with restart.txt” task :restart, :roles => :app, :except => { :no_release => true } do run "touch #{current_path}/tmp/restart.txt” end [:start, :stop].each do |t| desc "#{t} task is a no-op with mod_rails” task t, :roles => :app do ; end end end
- 10. Example Script (mongrel) require 'mongrel_cluster/recipes' namespace :deploy do task :restart do restart_mongrel_cluster end end
- 11. First-time server setup $ cap deploy:setup
- 12. :deploy_to/ |- releases/ - 201205041112 - 201206110904 |- current/ --> 201206110904
- 13. Deploy the app $ cap deploy
- 14. Deploy and run migrations cap deploy:migrations
- 16. Rollback to the last version $ cap rollback
- 17. Capistrano Best Practices
- 18. 1. Create Deploy User $ sudo useradd deploy (helps scope gems, config, logs, etc.)
- 19. 2. Cleanup Old Deploys $ cap cleanup (leaves last 5 deploys, removes the rest)
- 20. 3. Multi-Stage Deploy $ gem install capistrano-ext Bundler: gem „capistrano-ext‟
- 21. config/deploy.rb: set :stages, %w(production staging) set :default_stage, "staging” require 'capistrano/ext/multistage‟ Add users for each stage: $ sudo useradd staging $ sudo useradd production
- 22. 4. Disable sudo config/deploy.rb: :use_sudo false
- 23. 5. Colorize Capistrano $ gem install capistrano_colors In config/deploy.rb: require 'capistrano_colors'
- 25. Thank you @launchany james@launchany.com http://launchany.com