Configuration
Management
with Puppet
Introduction
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Configuration Management with Puppet: A Comprehensive Guide, Lecture notes of Architecture
An introduction to Puppet, a popular configuration management system and programming language. It covers the basics of Puppet, its architecture, and the tools required for its implementation. The document also explains the Puppet process, including registration, provisioning, and configuration, and provides examples of resources, manifests, and classes. It is a valuable resource for university students and IT professionals seeking to understand and use Puppet for managing IT infrastructure.
Typology: Lecture notes
2021/2022
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Configuration
Management
with Puppet
Introduction
What is Puppet
● is a configuration management system
● is a programming language
● offers a Client/Server architecture
● has a huge community
● widely used in the IT industry
● commercial support available if needed
Puppet process - Step 1
registration
Example: foreman, satellite, spacewalk ... Creates: Kickstart File and Puppet Node definition
Puppet process - Step 2
provisioning
Tool: Redhat anaconda, Ubuntu Fai, cobbler, preseed Input: anaconda configured by kickstart file preseed config file … Result: Installing minimal linux and puppet, and start Puppet after reboot
Contents
● Resources
● Manifests
● Ordering
● Variables, Conditionals, and Facts
● Classes
● Module
Resources
All elements of a node will be described as
resources
● Files
● User
● Services
● ... (about 50)
Example Resource
user { 'dave':
ensure => present,
uid => '507',
gid => 'admin',
shell => '/bin/zsh',
home => '/home/dave',
managehome => true,
Ressource shell
You can interact with the RAL directly.
● puppet resource user root
● puppet resource user dave \
ensure=present shell="/bin/zsh" \
home="/home/dave" managehome=true
Resource basic
● file vs. augeas
● yumrepo stages
● package ensure latest?
● exec only if needed
Manifests
● manifests are puppet programs
● puppet programs
○ declare resources
○ define conditions
○ group resources
○ generate text
○ link other manifests
○ define ordering
Manifests Run
actual status defined status
Puppet Action
/etc/service.conf
/etc/init.d/service: not running /etc/init.d/service: running
write file
start service
no file /etc/service.conf /etc/service.conf
start service
Manifests example!
file {'/tmp/test1': ensure => present, content => "Hi.", }
file {'/tmp/test2': ensure => directory, mode => 0644, }
file {'/tmp/test3': ensure => link, target => '/tmp/test1', }
notify {"I'm notifying you.":} notify {"So am I!":}
Facts example!
host {'self': ensure => present, name => $fqdn, host_aliases => [ 'puppet', $hostname ] , ip => $ipaddress, }
file {'motd': ensure => file, path => '/etc/motd', mode => 0644, content => "Welcome to ${hostname},\na ${operatingsystem} island in the sea of ${domain}.\n", }
Conditionals a first example!
if $is_virtual == 'true' { service {'ntpd': ensure => stopped, enable => false , } } else { service { 'ntpd': name => 'ntpd', ensure => running, enable => true , hasrestart => true , require => Package [ 'ntp' ] , } }