Thursday, April 21, 2016

Kitchen Chef's diagnosis center


Introduction

This time we familiarize you with the backings of chef kitchen. Chef kitchen provides you facility of trial and verification of your cookbooks over different  environment so that you can confidently use  them on your targeted infrastructure. This may be getting boring some times but here is always some seeds in oranges.  

Prerequisites

This blog requires an initial information about Git and Vagrant. This blog uses centos7   as platform. It needs basic understanding of chef, it's cookbooks and chef kitchen. To know about chef cookbooks and work with  chef kitchen follow our previous blogs of this series Chef Start here with ease...


Setup Kitchen

To setup kitchen chase same procedure as we cater in our previous blog Chef-Kitchen  Do it simply .

Backings of  Kitchen

Chef kitchen is the diagnosis center of chef.  Here  you can test the authenticity of your cookbooks on different platforms and confidently use them on your infra. Kitchen achive this by using its configuration file where you define all the things which are necessary to run the complete cycle of kitchen.

.kitchen.yml

This file contains all the required stuff to  run chef kitchen. This file is divided into four major sections.




  • Driver: This is  the name of a driver that will be used to create platform instances used during cookbook testing. This is the default driver used for all platforms and suites unless a platform or suite specifies a driver to override the default driver for that platform or suite; a driver specified for a suite will override a driver set for a platform.


  • Provisioner: This specifies how the chef-client will be simulated during testing. chef_zero andchef_solo are the most common provisioners used for testing cookbooks


  • Platforms: This is a the name of a platform on which Kitchen will perform cookbook testing, for example,ubuntu-12.04 or centos-6.4; depending on the platform.
  • Suites: This is a collection of test suites, with each suite_name grouping defining an aspect of a cookbook to be tested.


.kitchen directory

This directory holds logs for every kitchen run for each platform entry in .kitchen.yml file. This folder also holds keypair for the ssh into your virtual environment.

Analysis of Kitchen

Kitchen performs its own complete cycle of testing via different phases.  Kitchen has its five phases i.e., create, converge, login, verify and destroy.  Each phase has its own significance and some specific task is gonna performed in every phase.

Create

In this step chef’s kitchen tool creates a virtual instance. This virtual instance could use cloud or any other virtualization technology. Chef supports cookbook testing across many cloud providers and virtualization technologies.

Converge

This phase is responsible for application of your cookbook on virtual  instance. Here your all  cookbooks deployed into the virtual instance, though in next steps you can verify the complete functioning of your cookbooks.

Login

This step creates a ssh session into  your machine and provide you a login into it. So that you can run your test to verify the proper functioning of your cookbook.

Verify

In this  step you manually perform all checks so that you can certify the authenticity of your cookbook over all platforms.

Destroy

This is the final step  of your kitchen testing cycle. Here you destroy your virtual environment after entire testing phases.




Here is also a combine command for all these phases i.e.,  kitchen test. This command club all the commands in below listed manner.
  • Kitchen destroy
  • Kitchen create
  • Kitchen converge
  • Kitchen verify


Hass finally this over!!  I know you too get frustrated with the theories. We now aware with the backings of Chef Kitchen.  


Be Warned: I Am Bored. This Could Get Dangerous.

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