Ricardo Sanchez - Ruby projects of interest for devops
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The document summarizes Ricardo Sanchez's presentation on DevOps tools and Ruby/Rails. It discusses his background in operations and networking and introduces Ruby, Rails, RVM, Vagrant, Capistrano, Chef, and resources for learning Ruby. The presentation covers the basics of Ruby and Rails, how Rails applications work, and configuration/automation tools like RVM, Vagrant, Capistrano and Chef for managing servers and deployments.
Ricardo Sanchez - Ruby projects of interest for devops
- 1. Ricardo Sanchez @ricardojsanchez rsanchez.jayhawk@gmail.com svDevOps Meetup – August 3, 2010
- 2. Operations Architect for PlayHaven Started with Ruby/Rails in late 2008 Networking guy prior to that • Linux/Unix, kernel+user software development • C/C++, Routers/Switches, …
- 3. ShortRuby Intro Ruby projects Ruby Lab
- 4. Created by Yukihiro “Matz” Matsumoto First release 1995, renassaince 2005 Influenced by Python, Perl, and Lisp Focus on simplicity, productivity, and developer happiness Principle of least surprise Many interpreters • MRI, YARV, Jruby, Rubinius, IronRuby, REE, MacRuby, MagLev, … “Rubyist” are passionate and friendly people (Culture)
- 5. Object-Oriented With inheritance, mixins, and metaclasses Interpreted Dynamic typing and Duck typing Everything is an object, no primitives and many more “conventions”
- 6. Created by DHH (released 2004) Web application framework Model-View-Controller (MVC) pattern Stable 2.3.8, Beta 3.0 RC (just released) Principles • Convention over Configuration (CoC) • Don‟t Repeat Yourself (DRY) REST (Representational State Transfer)
- 7. Database Router Controller Model Model HTTP Controller Action Action Action Model Request Parameters Action View <h2>List of items: HTTP <% @items.each do |item| %> Response <li> Item: <%= item %></li> <% end %> </h2>
- 8. Request made from browser to URL http://localhost:3000/users/show/1 Rails receives request on port 3000 • Server invokes dispatcher (routing) :controller = users, :action = show, :id = 1 • Action fetches model object from database • Action renders view which generates HTML Rails sends response (HTML page) back
- 9. ActiveRecord ActionController ActionView ActionMailer ActiveSupport … is all morphing as Rails3 is introduced
- 10. Command line tool • Install multiple ruby interpreters/versions E.g.: ruby (1.8.6-p399, 1.8.7-p187, …); jruby, rubinius • Manage sets of gems („gemsets‟) • Perform operations over installed interpreters/gemsets Avail for all *nix systems (require „bash‟) Quick examples (no sudo needed!) • $ rvm install ruby-1.9.2, jruby Install • $ rvm use 1.9.1 Switching • $ rvm gemset use rails3 Managing Gems • $ rvm 1.8.7, 1.9.1, jruby tests Running tests • $ rvm 1.8.7, 1.9.1 rake do:all Running rake task http://rvm.beginrescueend.com
- 11. Tool for building and distributing virtualized development environments Uses Oracle‟s VirtualBox Main features • Automated provisioning using chef • Forward port to host machine • Full SSH access to created environments • Shared folders between host/guest(s) • Package environments into distributable boxes Great for distributable dev/qa environments To install: # gem install vagrant http://vagrantup.com
- 12. Task automation tool on remote servers Features • Restart particular service on multiple servers once $ cap HOSTS=„www-1,www-2‟ COMMAND=„/etc/init.d/apache2 restart” invoke • Check state of service/resource (memory,cpu) that is not monitored $ cap HOSTS=„www-1,www-2‟ COMMAND=„grep MemTotal /proc/meminfo‟ invoke • Run command in multiple servers and monitor output • Systems deployment tasks (e.g., Rails deployments) To install: # gem install capistrano http://capify.org
- 13. Problem: how to manage many servers Solution: consolidate access to infrastructure data for all nodes („systems integration‟) Chef provides configuration, integration, and operations as code (written in Ruby) • Treat infrastructure like software development projects Modes: solo, client/server Concepts • Nodes, Roles, Cookbooks, Recipes, Resources, Attributes Opscode offerings • Chef - Server Configuration Management Tool (API & DSL) • Opscode Platform (hosted chef server) http://www.opscode.com
- 14. Books • Programming Ruby 1.9 • The Ruby Programming Language • Practical Ruby for Systems Administration • Everyday Scripting with Ruby Online Learning • http://rubylearning.org (Free course) • http://github.com/edgecase/ruby_koans (FUN) Blogs • http://rubyinside.com • http://rubyflow.com
- 15. Installation (all platforms) • http://www.wiki.devchix.com/index.php?title=Work shop_Installation_Notes Ruby, RubyGems Editor (your choice) Exercise • Open irb $ irb >> puts “Hello world” • Save previous line on hello.rb, chmod +x, and run $ ruby hello.rb