Puppet 4 Essentials Second Edition by 2015

Puppet 4 Essentials Second Edition by 2015

Language: eng
Format: mobi, epub
Publisher: Packt Publishing


Technically, it is possible to stuff all of a module's manifests into its init.pp file, but you lose the advantages that a structured tree of module manifests offers.

Avoiding generalization

Each module should ideally serve a specific purpose. On a site that relies on Puppet to manage a diverse server infrastructure, there are likely modules for each respective service, such as apache, ssh, nagios, nginx, and so forth. There can also be site-specific modules such as users or shell_settings if the operations require this kind of fine-grained control. Such customized modules are sometimes just named after the group or the company that owns them.

The ideal granularity depends on the individual requirements of your setup. What you generally want to avoid are modules with names such as utilities or helpers, which serve as a melting pot for ideas that don't fit in any of the existing modules. Such a lack of organization can be detrimental to discipline and can lead to chaotic modules that include definitions that should have become their own respective modules instead.

Adding more modules is cheap. A module generally incurs no cost for the Puppet master operation, and your user experience will usually become more efficient with more modules, not less so. Of course, this balance can tip if your site imposes special documentation or other handling prerequisites on each module. Such rulings must then be weighed into the decisions about module organization.


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