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Basic Chef Fluency Kata

Originally posted in his Github repo, Michael Hedgpeth came up with this simple exercise that one can follow daily in order to gain proficiency in Chef.

We recommend that you spend one hour a day, getting as far through the kata as you can. After a while, I expect that you'll be able to get through the entire exercise in less than an hour!

Here is an example of a kata repo that follows these exercises. Each branch is a new day's kata.

Resources, Recipes, Cookbooks

  1. Create a chef-training repo on GitHub and clone it locally.

  2. Create a new branch using today's date in the name to track it.

  3. Ensure that you have a code editor with Chef Plugins installed. I recommend Visual Studio Code.

  4. Generate a cookbook into the chef-training repo

  5. Make your cookbook only support Ubuntu.

  6. Set up test kitchen to run the default recipe of your cookbook using Vagrant and VirtualBox.

  7. Ensure that Nano is installed (in an InSpec test and recipe). Run kitchen converge and verify to ensure this works.

  8. For the rest of the lab, create a Test Kitchen workflow that uses the kitchen create, kitchen converge, kitchen verify and kitchen destroy commands. Also, use kitchen login to manually ssh into your Ubuntu machine.

  9. Create /var/website directory.

  10. Make sure /var/old-website directory does not exist.

  11. Write a file /var/website/directions.txt with text "website goes here" in it.

  12. Write a file builder.txt to /var/website/builder.txt containing the text "[Your Name] built this" where [Your Name] is a cookbook attribute with your actual name.

  13. Download the Chef logo into /var/website: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSgQmQ0CYwU3cpFE6gEB82cp6TSIcBJSisax_HVvEfsgYHGBsO8kQ

  14. When you run test kitchen, builder.txt should contain the text Test Kitchen built this.

  15. Run the command echo ran command > /var/website/command.txt.

  16. Don't run the command the second time chef converges (i.e. make it idempotent).

  17. If the command does run, do a git pull of the architect repository into /var/website/architect (https://github.com/pages-themes/architect). It shouldn't pull the repository every time.

  18. Refactor your command and pull into a custom resource called chef_training_website.

  19. Make the git repo that you pull an attribute.

  20. Write a MyLogger class with a Log method that prepends the message CHEF TRAINING: and outputs that to the STDOUT (using puts).

Chef Server

Now that we've had some practice with basic cookbook development, let's get connected to a Chef Server.

  1. Create an Ubuntu virtual machine with VirtualBox.

  2. Set up an account on manage.chef.io and ensure your keys and knife.rb are available to your knife command on your workstation.

  3. Ensure your chef-training cookbook is uploaded to the Chef Server

  4. Bootstrap your machine running 2 recipes: chef-training and the os-hardening cookbook. You'll need to ensure the other cookbook is uploaded to the Chef Server as well.

  5. Run chef-client on the machine again, noticing that 0 resources are converged the second time.

Search

  1. On your workstation, search for all Ubuntu nodes.

  2. On your workstation, search for all nodes that match the attribute used to create the builder.txt file above.

  3. Create a data bag website with item messages. Inside of messages, have a welcomeMessage named Welcome to Chef Learning!

  4. In your chef-training cookbook, write a file /var/website/welcome.txt with the welcome message from the data bag.

  5. Push the updated cookbook to the Chef Server and reconverge, ensuring that the file is there on your Ubuntu VM.

  6. Update the data bag to Welcome to the BEST Chef Learning EVER!

  7. Reconverge and see that the file changed.

Advanced Administration

  1. Show the node's run list with knife and look it up in the UI.

  2. Create a role named security which includes the os-hardening cookbook.

  3. Read over the README of the os-hardening cookbook and find some attributes to set. Set those attributes in your security role.

  4. Change the run list on the command line to remove the os-hardening cookbook and add the security role.

  5. Reconverge and ensure that the behavior is the same.

  6. Create a development environment that will be assigned to your existing node. It should:

    • Always run the latest chef-training cookbook on the chef server
    • Run the 1.4.1 version of os-hardening cookbook
    • Have the builder.txt saying Development Built This
  7. Assign the development environment through the client.rb on your virtual machine

  8. Create another virtual machine that will be your "production" machine

    • Run a specific version of the chef-training cookbook
    • The builder.txt should say Production Built This
    • Assign the production environment through the client.rb
    • Update your chef-training cookbook to change the text of builder.txt. After uploading it to the Chef Server notice that only your development node was updated, but not your production node.

Chef Automate

For the first badge, you need to understand Automate itself, so this section won't be example driven but more idea driven.

Watch this video to get an overview of Chef Automate.

Now do this thought experiment:

  • How would you solidify your cookbook deployment workflow? (if you don't know workflow enough, watch this video)
  • How would you see what happens on your nodes?
  • How would you scan your nodes with inspec profiles?
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