DevOps classroom Series – 13/Apr/2020

Create a cookbook to install tree and elinks on ubuntu nodes

1. Create a cookbook
2. Naviagate to default.rb in recipes
3. Manual commands to install tree and elinks on ubuntu are

sudo apt-get update
sudo apt-get install tree -y
sudo apt-get install elinks -y

4. Find a resource for apt-get update and google apt-update in chef and results point to here
5. default.rb is default recipe and updating that would look like

#
# Cookbook:: myutilities
# Recipe:: default
#
# Copyright:: 2020, The Authors, All Rights Reserved.

# Manual command to install tree on ubuntu is 
# sudo apt-get update 
# sudo apt-get install tree

apt_update 'update'

6. Now sudo apt-get install tree and resource syntax looks as shown below
7. Modified cookbook to install elinks, tree and git

#
# Cookbook:: myutilities
# Recipe:: default
#
# Copyright:: 2020, The Authors, All Rights Reserved.

# Manual command to install tree on ubuntu is 
# sudo apt-get update 
# sudo apt-get install tree
# sudo apt-get install elinks
# sudo apt-get install git

apt_update 'update'

apt_package 'mytree' do
    package_name  'tree'
    action :install
end

apt_package 'myelinks' do
    package_name  'elinks'
    action :install
end

apt_package 'mygit' do
    package_name 'git'
    action :install
end

• Lets upload this cookbook to chef infra server

cd <chef-repo>\cookbooks\<cookbook-name>
berks install
berks upload

• To verify the upload of the cookbook

knife cookbook list

• Now lets edit run list from manage.chef.io to ubuntu nodes and verify the installation of git, tree and elinks
• Wait for the convergance to happen or in this case i had manually forced convergance

Chef Learning Approach

• Writing Chef Cookbooks (Learning Chef Domain Specific Language)
  • Its not a good idea to have un tested cookbooks uploaded to chef server.
• Manage the Chef infrastructure

Test-Kitchen

• To learn writing chef cookbooks and testing them, we will be using test-kitchen from chef
  • Test-Kitchen Setup from Azure Click Here
  • Test-Kitchen Setup from AWS Click Here
• Test-Kitchen helps in doing development, testing of the cookbooks from workstation without need of chef-server and chef-nodes and this is going to be your chef development setup.