By Chris Barbour
If you are already up to the mark on Puppet and understand how to jot down a uncomplicated module, this useful booklet takes you a severe step extra with top practices for construction out your Puppet infrastructure. You’ll tips on how to keep away from pitfalls that regularly depart many groups suffering to take care of what they already have.
Ideal for DevOps engineers—and written to hide the approaching Puppet four release—this ebook exhibits you the way most sensible to install Puppet with long term upkeep and destiny development in brain. This e-book essentially choices up the place different Puppet assets depart off.
- Leverage the most elements of Puppet, together with Hiera, roles and profiles, site.pp, modules, and exterior node classifiers
- Explore the aim of every Puppet part and know how it suits into the larger picture
- Avoid universal ways in which Puppet parts are abused
- Build a free up administration and deployment technique utilizing Git and R10k
- Learn approximately module layout styles, in addition to sub-classes, source relationships, containment, outlined kinds, and scope
- Apply improvement most sensible practices, together with the one accountability precept, Don’t Repeat your self, and Separation of Concerns
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Extra resources for Puppet Best Practices
Sample text
We’ll be taking a close look at inventory and reporting services in [Link to Come] Stateless | 27 There are plug-ins to Puppet that allow inventory information to be used during catalog compilation, however these are not core to Puppet. Custom Facts Facts themselves do not inherently add state to your Puppet manifests, however they can be used to communicate state to the Puppetmaster, which can then be used to compile conditional catalogs. We saw an example of this in [Link to Come] when dis‐ cussing non-declarative code.
Coding Principles | 47 create_resources('file', $files, $defaults) Example 4-1 has no benefits over using conventional file resource declarations with (or even without) resource defaults. See “Don’t Repeat Yourself (the DRY principle)” on page 52 for more examples. While this example is entirely written using the Puppet DSL, it is fairly common to see code like this implemented when a developer wishes to store resources in Hiera. There are a few specific cases where such an approach is entirely valid.
IF a manifest declares that a resource such as a user should exist, the compiler doesn’t have to be concerned with the current state of that resource when compiling a catalog. The catalog simply has to declare a desired state, and the Puppet agent simply has to enforce that state. Puppet’s stateless model has several major advantages over a stateful model: • Puppet scales horizontally • Catalogs can be compared • Catalogs can be cached locally to reduce server load It is worth noting that there are a few stateful features of Puppet.
