DevOps Classroom Series Chef – 25/Nov/2019

Lamp on Centos 7

• Manual Steps for Centos 7

sudo yum install httpd -y
sudo systemctl enable httpd.service
sudo systemctl start httpd.service
sudo yum install php php-mysql
sudo systemctl restart httpd.service
sudo vi /var/www/html/info.php
<?php phpinfo(); ?>

• Reference from here
• Create a new recipe called as httpdphp for redhat flavor

chef generate recipe . httpdphp

• Recipe will be as shown below

#
# Cookbook:: .
# Recipe:: httpdphp
#
# Copyright:: 2019, The Authors, All Rights Reserved.

package 'httpd' do
    action :install
    notifies :enable, 'service[httpd]'
end

package_names = ["php", "php-mysql"]

package_names.each do |package_name|
    package package_name do
        action :install
    end
end

cookbook_file '/var/www/html/info.php' do
    source 'info.php'
    action :create
    notifies :restart, 'service[httpd]'
end

service 'httpd' do
    action :nothing
end

• If you compare recipes of redhat and ubuntu, they are almost similar so trying to write one recipe for both.

• This requires to understand couple of concepts in chef

  • Node Object
  • Attributes

• Node Object:

  • Information collected about node during convergence.
  • This information is collected by Ohai
  • Information Collected by ohai will be stored as Node Object.
  • Accessing Node objects can be done in recipes by using following syntax node[key][childkey1]

• Next Steps:

  • Use Node Objects and User Defined Attributes to write one recipe for lamp stack which runs on ubuntu and centos.