Puppet Classes

 Puppet classes are defined as a collection of resources, which are grouped together in order to get a target node or machine in a desired state. These classes are defined inside Puppet manifest files which is located inside Puppet modules. The main purpose of using a class is to reduce the same code repetition inside any manifest file or any other Puppet code.

A class with no parameters

class puppet_user{
  user { 'puppet_user':
       ensure => present,
       uid => 1001,
       home => '/home/puppet_user'
       }
}
node default{
  include puppet_user
}

A class with parameters

class puppet_user($username){
  user { $username:
       ensure => present,
       uid => 1001,
       home => '/home/$username'
       }
}

#invoke the class
node default{
  class { puppet_user:
     username => 'puppet_user',
        }
}

Class example with if condition and multiple parameters

class user($username, $test) {

     user { $username:
            ensure => present,
            managehome => true,
          }
     if $test =='testing' {
          file { '/tmp/2.txt':
           content => $test,
          }
        }
     else
    {
         file { '/tmp/3.txt':
           content => $test,
          }

    }
}

node default {
       class { 'user':
               username => 'raman',
               test => 'notesting' ,
             }

}