Puppet 3 Cookbook

By John Arundel

Build trustworthy, scalable, safe, and high-performance structures to totally make the most of the facility of cloud computing

Overview

  • Use Puppet three to take keep watch over of your servers and pcs, with distinctive step by step instructions
  • Covers the entire renowned instruments and frameworks used with Puppet: Dashboard, Foreman, MCollective, and more
  • Teaches you ways to increase Puppet with customized capabilities, kinds, and providers
  • Packed with advice and encouraging rules for utilizing Puppet to automate server builds, deployments, and workflows

In Detail

A revolution is going on in net operations. Configuration administration instruments can construct servers in seconds, and automate all of your community. instruments like Puppet are necessary to taking complete good thing about the ability of cloud computing, and development trustworthy, scalable, safe, high-performance structures. progressively more platforms management and IT jobs require a few wisdom of configuration administration, and in particular Puppet.

"Puppet three Cookbook" takes you past the fundamentals to discover the entire energy of Puppet, exhibiting you intimately the right way to take on quite a few real-world difficulties and functions. At each step it indicates you precisely what instructions you want to style, and contains complete code samples for each recipe.

The e-book takes the reader from a uncomplicated wisdom of Puppet to a whole and professional realizing of Puppet’s most recent and such a lot complex positive aspects, group most sensible practices, writing nice manifests, scaling and function, and increasing Puppet by means of including your individual prone and assets. It begins with assistance on how one can manage and extend your Puppet infrastructure, then progresses via unique details at the language and contours, exterior instruments, reporting, tracking, and troubleshooting, and concludes with many particular recipes for dealing with renowned applications.

The publication comprises actual examples from creation platforms and methods which are in use in many of the world’s biggest Puppet installations, together with a dispensed Puppet structure in accordance with the Git model keep watch over process. It covers universal difficulties and blunders and indicates you the way to troubleshoot your Puppet manifests. You’ll be brought to robust instruments that paintings with Puppet corresponding to Hiera and MCollective. You’ll tips on how to use objection orientation and periods to put in writing robust, reusable manifests, and the way to embed Ruby code in templates. You’ll the way to expand Puppet with customized source kinds and prone. The publication additionally explains handling Rails functions and databases, construction internet servers, load balancers, high-availability structures with Heartbeat, and lots of different cutting-edge techniques.

What you'll research from this book

  • Install and arrange Puppet for the 1st time
  • Manage huge networks with instruments like Foreman and MCollective
  • Take keep watch over of configuration info with Hiera and encrypting secrets and techniques with GnuPG
  • Produce trustworthy, fresh, maintainable code to group criteria with puppet-lint and rspec-puppet
  • Use sessions and inheritance to jot down strong Puppet code
  • Deploy configuration documents and templates for lightning-fast installations
  • Use digital machines to construct try and staging environments, and creation platforms on cloud systems comparable to EC2
  • Automate each element of your structures together with provisioning, deployment, and alter management

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Com in our example): if $domain == 'UNSET' { $vhost_domain = $name } else { $vhost_domain = $domain } If the basis argument is not specific, we default to /var/www/${name}, the place back $name is the identify of the apache::vhost source: if $root == 'UNSET' { $vhost_root = "/var/www/${name}" } else { $vhost_root = $root } subsequent, we create the digital host dossier according to a template: dossier { "/etc/apache2/sites-available/${vhost_domain}. conf": content material => template('apache/vhost. erb'), require => Package['apache2-mpm-prefork'], notify => Exec["enable-${vhost_domain}-vhost"], } here is the template: ServerName <%= @vhost_domain percent> DocumentRoot <%= @vhost_root percent> ErrorLog /var/log/apache2/<%= @vhost_domain %>-error_log CustomLog /var/log/apache2/<%= @vhost_domain %>-access_log universal 148 Chapter 6 > let from all suggestions +Includes +Indexes +FollowSymLinks AllowOverride all you will discover that the single items of data which must be inserted into the template are the vhost_domain parameter and the vhost_root parameter. ultimately, we name the a2ensite command to inform Apache this web site could be enabled: exec { "enable-${vhost_domain}-vhost": command => "/usr/sbin/a2ensite ${vhost_domain}. conf", require => [ File["/etc/apache2/sites-available/${vhost_domain}. conf"], Package['apache2-mpm-prefork'] ], refreshonly => real, notify => Service['apache2'], } the following the price of exec is refreshonly, so it's going to in simple terms be brought on whilst the ${vhost_domain}. conf dossier is created or replaced. It additionally notifies the apache2 provider, to choose up the recent configuration. there is extra… this easy definition is sufficient to get you to begin operating web pages with Apache, yet there is a lot extra you are able to do with it. customized domain names and docroots As we have seen, the vhost_domain parameter will default to the resource's identify (cat-pictures. com within the example). if you'd like the digital host's area to be anything diverse, go within the area parameter: apache::vhost { 'networkr': area => 'networkr. com', } apache::vhost { 'networkr_staging': area => 'staging. networkr. com', } 149 Applications equally, if you would like to specify a special DocumentRoot parameter for the digital host than the default (/var/www/${name}), simply go within the root parameter: apache::vhost { 'communitysafety. org': root => '/var/apps/commsafe', } enhancing all websites the great thing about the template method is if you need to make a mild swap to the configuration for all websites (for instance, including a ServerAdmin electronic mail deal with) you are able to do it as soon as within the template dossier, and Puppet will replace all of the digital hosts it manages. within the instance, we purely used variables within the template, yet you could have as many as you're keen on. those should be neighborhood variables, as within the instance, or they are often proof: ServerName <%= @fqdn percent> Ruby expressions: ServerAdmin<%= @emails["admin"] percent> or arbitrary Ruby code: ServerAdmin <%= vhost_domain == 'coldcomfort. com' ? 'seth@coldcomfort.

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