Puppet is a configuration management tool that uses a declarative domain-specific language to define and manage the desired state of systems. It abstracts infrastructure elements as resources that can be configured and related to each other. For example, a Puppet manifest can install an openssh package, deploy an sshd configuration file, and ensure the sshd service is running. Puppet can operate in standalone mode running puppet apply commands or in a master/client mode where an agent regularly syncs nodes to the desired configuration defined on the master.

1. Puppet
Infrastructure as Code
Samir Chekkal
https://twitter.com/chekkal

2. Configuration Management

3. CM Tools
Puppet
Chef
CFEngine
Salt
Ansible

4. Puppet
Configuration Management Tool
A Declarative Domain Specific Language (DSL)
Final State of the System

5. Directory Layout
|-- Puppetfile
|-- modules
|-- manifests: *.pp
|-- templates: *.rb
|-- files
|-- lib

6. Resource Abstraction Layer

7. Puppet DSL Example
package { 'openssh-server':
ensure => installed,
}
file { '/etc/ssh/sshd_config':
source => 'puppet:///modules/sshd/sshd_config',
owner => 'root',
group => 'root',
mode => '640',
notify => Service['sshd'], # sshd will restart whenever you edit this file.
require => Package['openssh-server'],
}
service { 'sshd':
ensure => running,
enable => true,
hasstatus => true,
hasrestart => true,
}
type title argument

8. Operational modes
Puppet Standalone
Puppet Master/Client

9. Puppet Standalone: $ puppet apply

10. Puppet Master: $ puppet agent -t

12. Resources
https://docs.puppetlabs.com/
https://puppetlabs.com/download-learning-vm
http://www.example42.com/tutorials/PuppetTutorial/
https://en.wikipedia.org
https://www.iconfinder.com/iconsets/designer-skills