Working with Puppet Apply and Manifests

by scmGalaxy.com

Rajesh Kumar

(Senior DevOps Manager & Principal Architect)

www.rajeshkumar.xyz

/RajeshKumarLog

/RajeshKumarIN

Agenda

The Basics

Introduction To Configuration Management
About The Author
Why Puppet?
How To Access Your Working Files

Benefits

Class recordings
Presentations
Assignments with personal assistance
Life time free re-enrollment to future Puppet courses
Projects

Pre-requisites

Recommended Experience

Basic Linux Familiarity
Simple LAN Networking
Recommended Equipment
Virtualization Platform
Several Servers with Networking Equipment

Objectives

What are Puppet Manifests
Using Puppet Apply
Ensure Puppet agent is stopped and disabled
Puppet style guide
Syntax highlighting and styling in vim

Puppet Manifests


    notify {'Hello World':}

Hello World

The notify resource type can be used to send a message to the agent log or screen if being used interactively. This makes a great and simple first manifest.


  sudo puppet parser validate helloworld.pp

Validate the Manifests

Although this manifest is very simple we should get in the habit of validating code as we create it. Helping to keep our code robust and healthy.

Creating a Manifest

Puppet Architecture


    sudo puppet parser validate helloworld.pp
    sudo puppet apply -e "notify { 'Hello World': }"

Puppet Apply

We can use the application puppet apply to enforce a local manifest or puppet code.


   sudo pupet resource service puppet
   service { 'puppet':
		ensure => 'stopped',
		enable => false,
	}
   sudo puppet parser validate puppet-service.pp 
   sudo puppet apply puppet-service.pp

Controlling the Agent

We currently do want to use the Puppet agent. This can run as a daemon service so we should check that it is both stopped and disabled.


    service { 'puppet':
	ensure => 'stopped',
	enable => false,
	}

Ensure the Puppet Agent is not running and is disabled.

Using Puppet Apply

Puppet Style Guide

Most languages have their recommend style guide. The way the code should be laid out. The full guide is in the documentation:

http://docs.puppet.com/guide/style_guide.html


sudo puppet module install theurbanpenguin/puppet_vim
include puppet_vim
sudo puppet parser validate puppet_vim.pp
sudo puppet apply puppet_vim.pp

IDEs

IDEs or integrated Design Environments can help with styling. We use the text editor VIM in this course. Even this through can help with styling. It is easiest to install the required elements using a Puppet Module.