Download e-book for iPad: Pro Puppet (2nd Edition) by James Turnbull, Spencer Krum, William Van Hevelingen, Ben

By James Turnbull, Spencer Krum, William Van Hevelingen, Ben Kero, Jeffery McCune

ISBN-10: 1430260416

ISBN-13: 9781430260417

Seasoned Puppet, moment variation, now up-to-date for Puppet three, is an in-depth advisor to fitting, utilizing, and constructing the preferred configuration administration device Puppet.

Puppet offers how to automate every thing from consumer administration to server configuration. You'll learn the way Puppet has replaced within the newest model, find out how to apply it to various structures, together with home windows, how you can paintings with Puppet modules, and the way to take advantage of Hiera.

Puppet is a must have software for approach directors, and professional Puppet will train you the way to maximise its functions and customise it on your environment.

Install and configure Puppet to right away commence automating initiatives and create reporting solutions

Learn insider methods and methods to higher deal with your infrastructure

Become a Puppet professional!

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Extra info for Pro Puppet (2nd Edition)

Sample text

Puppet Enterprise uses a composite modulepath, bringing in standard modules from /opt/puppet/share and local modules from /etc/puppetlabs/modules. It’s very important that modules are structured properly. For example, our sudo module contains the lines shown in Listing 2-9. Listing 2-9. pp (Listing 2-10), we create a class with the name of our module. Listing 2-10. pp class sudo { configuration... } Last, we can apply a module, like the sudo module we created in Chapter 1, to a node by using the include function as shown in Listing 2-11.

A better solution is to use parameterized classes and one glue class to define high-level behaviors at node level. pp. Variable Scoping The topic of node inheritance is a good place to talk about an important and sometimes tricky concept in Puppet: variable scoping. N Caution Variable scoping in Puppet has changed significantly. 0, variable scoping was dynamic. 0, scoping is not dynamic. This mostly affects class inheritance Four scopes are available: top scope, node scope, parent scope, and local scope.

This means we could end up scattering a lot of very similar conditional statements across our Puppet code. That’s pretty messy; as a best practice we recommend that you move all your conditional checks to a separate class. This greatly improves code readability. We usually call that class module::params, so in our current case it would be named ssh::params. As before, we’re going to store that class in a separate file. pp We can see that class in Listing 2-16. Listing 2-16. The ssh::params class class ssh::params { case $::osfamily { Solaris: { $ssh_package_name = 'openssh' } Debian: { $ssh_package_name = 'openssh-server' } RedHat: { $ssh_package_name = 'openssh-server' } default: { fail("Module propuppet-ssh does not support osfamily: ${::osfamily}") } } } 48 CHAPTER 2 N BUILDING HOSTS WITH PUPPET You can see that inside our ssh::params class we’ve created another type of conditional, the case statement.

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Pro Puppet (2nd Edition) by James Turnbull, Spencer Krum, William Van Hevelingen, Ben Kero, Jeffery McCune


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