The document discusses Capistrano, an open source tool written in Ruby for automating remote server tasks and deployments. Capistrano allows defining deployment workflows and tasks in a Ruby DSL. It supports features like zero-downtime deployments, rollbacks, multistaging, and roles. The document provides instructions on installing Capistrano and configuring deployments, and highlights how Capistrano addresses pain points in traditional deployment methods.

1. ВЫКЛАДКА
БЕЗ БОЛИ С
CAPISTRANO
PAINLESS DEPLOYMENT WITH CAPISTRANO
Николай Кугаевский / @kugaevsky

2. TRUE OLD SCHOOL
Rsync
SCP
FTP

3. NOT SO OLD
ssh → git pull
Fabric

4. MONSTAZ!
Puppet
Chef
Salt
Ansible

5. CAPISTRANO TO THE RESCUE

6. CAPISTRANO
Capistrano is a remote server automation and deployment tool
written in Ruby.
It supports the scripting and execution of arbitrary tasks, and
includes a set of sane-default deployment workflows.

7. CAPISTRANO
Ruby
Open source
Expressive DSL
Simity
0-time deploy/rollback
Multistaging
Roles

8. INSTALL AND INIT
$ cd my_perfect_app
$ gem install capistrano
$ cap install

9. CONFIG
# config/deploy.rb
set :application, 'slides'
set :repo_url, 'git@github.com:kugaevsky/slides.git'
# config/deploy/staging.rb
role :app, %w{nick@kugaevsky.ru}
set :deploy_to, '/home/kugaevsky/www/slides.kugaevsky.ru'
set :user, 'nick'

10. ANATOMY LOCAL
my_perfect_app
├── Capfile
├── config
│ ├── deploy
│ │ ├── production.rb
│ │ ├── staging.rb
│ │ └── ...
│ └── deploy.rb
└── lib
└── capistrano
└── tasks

11. ANATOMY HOST
my_perfect_app
├── current → ../releases/20141209222103
├── releases
│ ├── 20141209220703
│ ├── 20141209222103
│ └── ...
├── repo
│ ├── branches
│ ├── config
│ ├── description
│ └── ...
└── shared
├── node_modules
├── uploads
├── vendor
└── ...

12. DEPLOY FLOW
deploy:starting # start a deployment, make sure everything is ready
deploy:started # started hook (for custom tasks)
deploy:updating # update server(s) with a new release
deploy:updated # updated hook
deploy:publishing # publish the new release
deploy:published # published hook
deploy:finishing # finish the deployment, clean up everything
deploy:finished # finished hook

13. ROLLBACK FLOW
deploy:starting
deploy:started
deploy:reverting # revert server(s) to previous release
deploy:reverted # reverted hook
deploy:publishing
deploy:published
deploy:finishing_rollback # finish the rollback, clean up everything
deploy:finished

14. PLUGINS!
# Capfile
require 'capistrano/rvm'
require 'capistrano/rbenv'
require 'capistrano/chruby'
require 'capistrano/bundler'
require 'capistrano/rails/assets'
require 'capistrano/rails/migrations'

15. REAL WORLD EXAMPLE
# config/deploy.rb
desc 'Create symlinks for npm modules'
task :npm do
on roles(:app) do
execute "ln -nfs #{shared_path}/node_modules #{release_path}/node_modules"
end
end
desc 'Install npm modules'
task :npm do
on roles(:app) do
execute "cd #{release_path} && npm install"
end
end
desc 'Compile assets'
task :compile_assets do
on roles(:app) do
execute "cd #{release_path} && #{shared_path}/node_modules/.bin/gulp compile:production"
end
end

17. ALTERNATIVES
Vlad the Deployer
Mina

18. READING
Capistrano official site
Repository on GitHub
How To Use Capistrano to Automate Deployments

19. СПАСИБО
ВЫКЛАДКА БЕЗ БОЛИ С CAPISTRANO
PAINLESS DEPLOYMENT WITH CAPISTRANO
http://slides.kugaevsky.ru/
для
Николай Кугаевский rannts#3