Book Image

Mastering Chef

By : Mayank Joshi
Book Image

Mastering Chef

By: Mayank Joshi

Overview of this book

Table of Contents (20 chapters)
Mastering Chef
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
2
Knife and Its Associated Plugins
10
Data Bags and Templates
Index

Different sources of attributes


An attribute can be defined at multiple places and it is very important to declare an attribute at the right place with right precedence order. During a chef-client run, attributes are collected from the following different sources:

  • Nodes (collected by Ohai at the start of each chef-client run)

  • Attribute files (associated with cookbook) are collected during compile time

  • Recipes (associated with cookbook. The attributes specified in the recipes might be collected during run time as well

  • Environments

  • Roles

The life cycle of an attribute can be understood by the following sequence of steps:

  1. Developer writes attributes in the attribute file, recipe, role, or environment.

  2. The concerned code is pushed to the Chef server.

  3. During the chef-client run, Ohai collects all the automatic attributes from the node.

  4. The chef-client will pull node object from the chef-server, which will in turn bring in the normal attributes that are persistent.

  5. The chef-client will update the cookbook...