Chef note

# Meet Chef

## Recap : Terminology

+ node
  A host where the Chef client will run (db,web,worker)
+ chef client
  The command line program of that configures servers
+ chef server
  A database-backed web server that stores searchable information about your production servers.
+ chef solo
  A standalone version of the chef client
+ recipe
  A single ruby file that contains commands to run on a node
+ resource
  A node's resources include files, directories, users and services (UNIX processes)
+ cookbook
  A collection of Chef recipes (nginx cookbook include nginx, ssl and rewrite modules)
+ role
  Reusable configuarion for multiple nodes (web role, database role)
+ run list
  A list of roles and recipe to run on the node
+ attribute
  Varibles that are passed through Chef and used in recipes and templates.
+ template
  A file with placeholders for attributes. This will be use to create configuration files.
+ notification
  When resource is changed, it can trigger an update in another resource

## Attributes

left attributes overwrite right
Node > Role > Environment > Cookbook

### Attribute kinds:

+ Automatic
V
+ override
V
+ normal/set
V
+ default

##Deploy Rails
+ Deploy a Rails application
+ Use the Capistrano deployment tool
+ Launch the Unicorn application server

##Attributes
+ understand attributes

### dsl


remote_directory : copy entire directory to node
cookbook_file : copy single file to node
- same thing but different names -