ChefIn a Nutshell

Chef?

● Thick Clients, Thin Server● Order Matters● Ruby● Chef Solo● OHAI ● Knife

Chef Server Architecture

Chef Components

● Chef Client○ Public/Private key○ Machines/Humans

● Chef Node ● Chef Indexer

○ RabbitMQ○ Chef Expander/SOLR

● Chef Server○ CouchDB○ Web Interface○ REST API

● Chef Solo○ Vagrant - development and tests

Cooking with Chef

● Nodes○ Roles○ Cookbooks○ Recipes ○ Resources

● Environment● Data bags (JSON)

Anatomy of a Chef Run

Anatomy of a Chef Run

● Build, Register, and Authenticate the Node○ OHAI○ chef-validator○ client.pem

● Synchronize Cookbooks○ Libraries○ Attributes○ Definitions○ Recipes

Anatomy of a Chef Run

● Compile Resource Collection○ Load Libraries○ Load Attributes○ Load Definitions○ Load Recipes

● Configure Node○ Converge○ Save Node○ Run Notifications

OHAI

● Gem● Windows● Standalone● Ruby library● Plugins

Chef Basics

● Node○ Run List

■ Recipe■ Role (Ruby/JSON)

○ Attributes○ Tags

● Data Bags○ JSON○ Search○ Encrypte

● Search

Chef Basics● Cookbooks

○ Recipe○ Resources

■ Deploy■ AWS■ Dynect■ Gem, PyPi e PEAR

○ Metadata○ Providers

■ LWRP○ Search○ Exception and Report Handler

Cookbooks

● Version● Library

○ Ruby code● Metadata

○ name○ version○ depends/conflicts/replaces○ supports

● Templates○ ERB

Cookbooks

● Attributes○ override○ normal○ default

● Definitions● File Distribution● Recipes

○ include○ search○ data bags○ tag

Managing Chef

● Knife○ Bootstrap○ Exec

■ SSH ○ Plugin

■ Windows■ knife-windows ■ Windows Remote Management■ PowerShell

■ EC2/Rackspace/Slicehost/Terremark● Shef

○ irb

Workflow● Environments● Freeze● Metadata version

Development1. Bump the version number as appropriate2. Hack3. Upload and test4. Repeat 2 and 3 as necessary

Production1. Upload and freeze your cookbooks2. Modify your environment to prefer the new version you uploaded3. Upload the updated environment4. Deploy

Links

Opscode Platform "The first five nodes are free!"

Opscode Wiki A Brief Chef Tutorial

Example Cookbooks:

http://github.com/opscode/cookbooks

http://github.com/37signals/37s_cookbooks

http://github.com/engineyard/ey-cloud-recipes