DevOps Classroom Series – 28/May/2021 – Direct DevOps from Quality Thought

sudo apt update
sudo apt install apache2 -y

Now lets try to create a cookbook in chef which automates the above activity
We need a cookbook:
- Navigate to chef-repo\cookbooks folder
- Lets create a chef cookbook Refer Here
- I will be creating a cookbook for installing apache using the following
```
chef generate cookbook myapache -b --chef-license accept
```
A new directory will be created. will have some files and folders
Chef is developed using ruby language. Chef has its own DSL (Domain Specific Language). If required we can directly use ruby in chef cookbooks.
Launch the cookbook in visual studio code, install chef extension
Now execute the command berks install
In Chef cookbook there is already a recipe created called as default (recipes\default.rb)
In chef recipe we will be using resources to automate the manual steps
The resources in chef will have following syntax

<resource type> 'name' do 
   property1 value1
   ...
   propertyn valuen
   action <action to acheive>
end


apt_update 'ubuntu packages' do
  action :update
end

# sudo apt install apache2 -y
apt_package 'apache2' do
    action :install
end

berks upload

Once the cookbook is uploaded, we need to specify to chef server on which nodes should the recipes be executed.
Now we need to change the nodes run_list
Do this for the other ubuntu node
Now we can wait till the nodes query the server about the work that needs to be done (Convergence)
For lab purposes lets manually force the convergence
- login into the node & execute sudo chef-client
Creating and making cookbooks work is the major activity in the cookbook development
Uploading cookbook to the server adding it to run_list etc can be done once our cookbooks are working.
Next Steps:
- Becoming good at writing cookbooks
- Local development of cookbooks, testing them and upload right versions to server

Cookbook