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Puppet

Preface

This tutorial is using Puppet 2015.03.

This is not the latest version of Puppet, future classes may require you to install a newer version!

Installation Guide

0. sudo -s
1. yum -y update
2. yum -y install wget vim
3. cd /tmp
4. wget http://titan.csit.rmit.edu.au/~e09962/usap2015/puppet/puppet.tar.gz
5. tar -zxvf puppet.tar.gz
6. puppet-enterprise-2015.2.0-el-7-x86_64/puppet-enterprise-installer (follow the prompts)
7. Once the installer is finished, go to your EC2 Instances **external** hostname on port 3000
8. Follow the installer (select `Monolithic` and enter the external hostname as the `FQDN`)
9. Ignore any validation errors (our server is fine for testing)
10. Hit deploy now and wait until it is done
11. Log into the console once it's finished

Our first module

class usaptest {
  user { 'becca':
    ensure => present,
    groups => ['rmit'],
  }

  group { 'rmit':
    ensure => present,
  }

  package { 'vim':
    ensure => present,
  }
}
  1. Put this code on the master in /etc/puppetlabs/code/environments/production/manifests/usaptest.pp
  2. Validate the file with /usr/local/bin/puppet parser validate WHATEVER.pp (make sure there are no errors)

Let's apply this via the PE console (lecture demo)

  1. Log in and go to Nodes > Classification
  2. Create a new Node Group called usap
  3. Add our class usaptest under Classes and pin our master under Rules
  4. Make sure to commit all changes
  5. Let's prove it worked (you can force a run with /usr/local/bin/puppet agent apply --test)

Things to discuss

  • How does puppet know what OS we are running the agent on
  • How does puppet work out dependencies (how does it know to create the group before the user for example)
  • How does puppet know how to create the user (this differs on platforms)
  • How does puppet know how to install the package vim (explain what facter is)
  • What is a no-op
  • PE vs Puppet Open Source

Next steps

  • Docs https://docs.puppet.com/pe/2015.3/ (make sure you refer to the 2015.3 docs at all times, there are breaking changes in newer versions)
  • Here we are using the master to manage itself, how would you connect a new node to the master and manage it?
    • What are all the steps required (instance, network, firewall, authentication, configuration, etc...)