Chef, Vagrant and Friends
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Chef, Vagrant and Friends

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An introduction to using Chef and Vagrant for entry level users.

An introduction to using Chef and Vagrant for entry level users.

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Chef, Vagrant and Friends Chef, Vagrant and Friends Presentation Transcript

  • CHEF, VAGRANT AND FRIENDS AUTOMATING YOUR ENVIRONMENTS
  • @benmcrae • Software engineer • CompareTheMarket.com • Travelling & listening to music • Coffee / real ale drinker
  • YOU? View slide
  • MASTER CHEFS View slide
  • SOFTWARE! CONFIGURATION MANAGEMENT
  • Chef can automate how you configure, deploy and scale your servers and applications.
  • GETTING STARTED
  • Installing Chef 11 ! Chef Omnibus (Linux, OS X, Windows) Chef DK (April 2014, v0.1.0) (Bundled software) Gem (Ruby 1.9.3 recommended)
  • Chef CLI tools ohai (node attributes) chef-apply (execute a single recipe from the command line) chef-solo (execute run lists and cookbooks on a node) chef-client (retrieves & executes run lists & cookbooks on nodes) knife (interact with chef server)
  • INFRASTRUCTURE AS CODE
  • Resources Resources represent a piece of the system and its desired state. Some resources available:! • Directories • Users • Groups • Services • Packages
  • Resource Syntax A resource is a Ruby block with four components: • A type • A name • One (or more) attributes (with values) • One (or more) actions
  • Recipe Recipes are what you write to install and configure things on your machine.! • Authored using a Ruby DSL • Made from multiple resources • Can include other recipes • Single responsibility in purpose • Belongs to a Cookbook
  • Recipe DSL A Ruby DSL, with specific methods to write chef recipes and resource blocks. Common Ruby syntax can be used with the Recipe DSL methods. if / case statements…
  • FIRST RECIPE
  • Ingredients • Using chef-apply and a single recipe • Create a new developer user on the system • Install Git using the OS package manager • Create a .gitconfig file for the developer user
  • stage-1 https://github.com/benmcrae/ddd-chef-examples/tree/master/stage-1
  • Chef Run • Recipe loaded • Resources are arranged in an ordered queue • Each resource is mapped to a Provider! • The node Converges by executing each provider
  • Providers Providers define steps that are needed to bring a piece of the system from its current state into the desired state.
  • Idempotent A recipe can run multiple times on the same system and the results will always be identical.
  • RETROSPECTIVE
  • Outcomes • Poor single responsibility • Use better suited resources e.g. template / file • Fixed values could be swapped for attributes
  • Next Steps 1. Create cookbook from existing recipe 2. Refactor outcomes from retrospective
  • FIRST COOKBOOK
  • Cookbook A cookbook defines a scenario, such as everything needed to install and configure Apache and the resources that support it.
  • Cookbook Folders • attributes - attribute files, loaded in alphabetical order! • files - stored files for file and directory resources! • libraries - arbitrary ruby libraries, used in recipes! • providers - custom providers (LWRP)! • recipes - recipe files! • resources - custom resources (LWRP)! • templates - erb files for the template resource
  • Cookbook Generators • knife cookbook create ‘cookbook name’ • berks cookbook ‘cookbook name’
  • Metadata File • The metadata.rb sits in the cookbook root directory • Defines cookbook name, version, and description • Can declare dependencies on other cookbooks • List supported operating systems
  • REFACTOR
  • Template Resource • Uses ERB (Embedded Ruby) files • Supports variables and hashes in templates • Multi nested folders designed to support distributing files across platforms • Best practice: set variables using attributes
  • Node Object • Attributes - An attribute is a specific piece of data about the node! • Run list - A run-list is an ordered list of recipes and/or roles that are run in an exact order
  • Attributes ! • Attributes can be defined by the node, recipes, cookbooks, roles and environments! • Node information. i.e. IP / MAC addresses, OS info • Recipe information. i.e. directory paths, users, application data
  • Overriding Attributes
  • Ohai Ohai is a CLI tool that is used to detect attributes on a node! • Platform details • Network usage • Memory usage • Processor usage
  • Run List • A run-list defines all of the configuration settings that are necessary for a node to converge • An ordered list of roles and/or recipes that are run in an exact order
  • chef-solo • chef-solo allows using cookbooks on nodes without using Chef server • Cookbooks & dependencies must be on the node • Limited in functionality compared to chef-server • Requires configuration; run-list and attributes
  • stage-2 https://github.com/benmcrae/ddd-chef-examples/tree/master/stage-2
  • Chef Run • Builds node object! • Expands run-list • Compiles Resources in an ordered queue • Each resource is mapped to a Provider! • The node Converges by executing each provider
  • RETROSPECTIVE
  • Outcomes • A single cookbook to manage our developer user • A cookbook that can be used with both chef-solo and chef-client (Chef Server)
  • Next Steps • Introduce community cookbooks and Berkshelf • Install Ruby 2.1.2, using Berkshelf
  • COMMUNITY COOKBOOKS
  • Community Cookbooks • An online Open Source cookbook repository, maintained and used by the chef community. • Trusted cookbooks can be downloaded from - http://community.opscode.com • Cookbook dependencies are not automatically downloaded. This must be done by looking through the cookbook metadata file, and manually downloading listed cookbooks.
  • Berkshelf • The cookbook dependency manager • gem install berkshelf • Used to maintain cookbooks on your Chef Server • Written by Jamie Windsor, and Seth Vargo
  • Berksfile • Lives in the root directory of the Cookbook • Lists each cookbook name, and version (optional) which your cookbook depends on • Ability to read cookbook dependencies from metadata.rb file • Traverses over other cookbook dependencies
  • stage-3 https://github.com/benmcrae/ddd-chef-examples/tree/master/stage-3
  • RETROSPECTIVE
  • Outcomes • Implemented a community cookbook with the aid of Berkshelf. • Applied our knowledge of attributes to other cookbooks.
  • Next Steps • Provision the node automatically with chef-solo and Vagrant. • Create a new recipe to git clone our ruby app into the developer home directory.
  • • Create and configure lightweight, reproducible, and portable development environments. • Vagrant stands on the shoulders of giants. Machines are provisioned on top of VirtualBox, VMware, AWS, or any other provider. • Provision machines with, shell scripts, Chef, or Puppet.
  • Commands • vagrant init hashicorp/precise32 • vagrant up • vagrant provision • vagrant halt • vagrant destroy
  • Vagrant Provision • Move the run list and attributes into the Vagrantfile • Vagrant will run chef-solo on VM start, or by running the provision command
  • Git Resource • Manage source control resources that exist in a git repository • Functionality for revision and branching control • Offers both export and syncing abilities
  • stage-4 https://github.com/benmcrae/ddd-chef-examples/tree/master/stage-4
  • RETROSPECTIVE
  • Outcomes • Used Vagrant to run chef-solo and setup our node • Established our cookbook development workflow • Finished cookbook
  • VAGRANT CONT.
  • More Features • Full support for both Linux and Windows guest’s • Mount directories using either NFS, SMB or Rsync • Multi machine environments • Network support - port forwarding, private networks
  • Vagrant Cloud • Share a link to your web server to a teammate across the country • Community collection of fully baked box images • Distribute versionable private environments to your team
  • Share / Connect • Share SSH access to other vagrant users • Share the whole machine as a local entity to other vagrant users
  • Vagrant Plugins • vagrant plugin install <plugin_name> • vagrant-sahara (operate in a sandbox environment) • vagrant-proxy (define http and https proxies)
  • Chef Reading • Test-Driven Infrastructure with Chef, 2nd Edition
 - Steven Nelson-Smith • Chef Infrastructure Automation Cookbook 
 - Matthias Marschall • Learning Chef (Released Sep 2014)
 - Seth Vargo, Mischa Taylor • https://learnchef.opscode.com/
  • Vagrant Reading • Vagrant: Up and Running - Mitchell Hashimoto • http://docs.vagrantup.com/ • http://www.vagrantup.com/blog.html
  • THANK YOU