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Chef Infrastructure Automation Cookbook Second Edition

Chef Infrastructure Automation Cookbook Second Edition

By : Marschall
3.7 (6)
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Chef Infrastructure Automation Cookbook Second Edition

Chef Infrastructure Automation Cookbook Second Edition

3.7 (6)
By: Marschall

Overview of this book

This book is for system engineers and administrators who have a fundamental understanding of information management systems and infrastructure. It helps if you've already played around with Chef; however, this book covers all the important topics you will need to know. If you don't want to dig through a whole book before you can get started, this book is for you, as it features a set of independent recipes you can try out immediately.
Table of Contents (9 chapters)
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8
Index

Accessing data bag values from external scripts


Sometimes, you cannot put a server under full Chef control (yet). In such cases, you might want to be able to access the values managed in Chef data bags from scripts, which are not maintained by Chef. The easiest way to do this is to dump the data bag values (or any node values for that matter) into a JSON file and let your external script read them from there.

Getting ready

Make sure you have a cookbook called my_cookbook, and that the run_list of your node includes my_cookbook, as described in the Creating and using cookbooks recipe in Chapter 1, Chef Infrastructure.

Create a data, as shown in the following steps, so that we can use its values later:

  1. Create the data bag:

    mma@laptop:~/chef-repo $ mkdir data_bags/servers
    mma@laptop:~/chef-repo $ knife data bag create servers
    
    Created data_bag[servers]
  2. Create the first data bag item:

    mma@laptop:~/chef-repo $ subl data_bags/servers/backup.json
    
    {
      "id": "backup",
      "host": "10.0.0.12"
    }
    mma@laptop...

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