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Chef- Recipe

Chef – Recipe

Chef written in Ruby. Now we are going to create a recipe -hello.rb”, here. rb is Ruby extension. Collection of Recipes are called Cookbook.

chef-apply

  • chef-apply tool is installed with the ChefDK. This is used to execute a single recipe on your local machine. There is no Chef server involved. Everything is local.

  • chef-apply is not a tool for the deployment of production nodes. It’s just a quick and easy way to use Chef to configure your local system.

Syntax

sudo chef-apply -e "package '<pkg-name>"

sudo chef-apply <recipe>


Resource Syntax

A resource is a Ruby block with four components:

  • type
  • name
  • one (or more) properties (with values)
  • one (or more) actions.

The syntax for a resource is like this:

type 'name' do
   attribute 'value'
   action :type_of_action
end


Chef Recipe– Hello World Recipe on Localhost

1.Create chef_repo folder, go into it

mkdir chef_repo
cd chef_repo

2.create `hello.rb` file inside chef_repo

file 'hello.txt' do
	content 'Hello, World'
end

3.Apply recipe to Current System.
The above Code means, create a resource(file) with name `hello.txt` with content as -hello world”. By executing chef-apply hello.rd, Chef will create a new file in our current infrastructure system

chef-apply hello.rb

4.Now check, we can observe file is created with `hello.txt`

5.Similarly, if you want to delete file, change hello.rb with below lines

file 'hello.txt' do
	action:delete
end


Chef Recipe– Install Apache on Localhost

In above example, we just created a file as a resource in host(local) machine. Now go to more advance install Software as a pkg in host machine

  • Apache2 pkg should install in host machine

  • Apache2 Should enable & Auto Start

  • Create index.html, & make it as apache Homepage

1.Create `apache.rd` to perform above 3 steps on host system

package 'apache2'
# Here package apache2 has default action is install, so we didn't mention that action here. Space between action & [] must be there
service 'apache2' do
        action [:enable, :start]
end

# Create a File with content to display Hello, Chef
file '/var/www/html/index.html' do
	content '<h1>Hello, Chef!!</h1>'
end

2. Run `apache.rb` recipe using `chef-apply`

chef-apply apache.rb

3.Check Apache status

service apache2 status
* apache2 is running

4.Check index.html by opening localhost/IP in browser

5.we can check using curl as well

curl localhost

<h1>Hello, Chef!!</h1>
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