By Chris Barbour
If you are already on top of things on Puppet and understand how to jot down a uncomplicated module, this functional publication takes you a severe step additional with most sensible practices for development out your Puppet infrastructure. You’ll easy methods 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 impending Puppet four release—this booklet indicates you the way top to install Puppet with long term upkeep and destiny progress in brain. This booklet sincerely selections 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 the way it suits into the larger picture
- Avoid universal ways in which Puppet parts are abused
- Build a unlock 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
If you chose not to follow the Puppet Labs style guide, I recommend documenting and publishing a style guide for your site. When working at a site that follows it’s own style, it’s a good idea to adapt that style for site-wide consistency. In many cases, having one consistent imperfect style is much better than having multiple coding styles 2 I strongly encourage you to deploy puppet-lint and to include it as a pre-push hook for your projects in order to encourage conformity to the style guide.
Those considerations are discussed in [Link to Come]. The Single Responsibility Principle Resources, data Structures, classes, and function calls in Puppet should have one re‐ sponsibility, and no more than one responsibility. Ideally, you should be able to describe anything you build in Puppet without using the word and. For example: • This class manages Apache’s packages • This case statement sets platform specific defaults • This conditional determines the correct resource ensure state • This function call validates URLs • This resource downloads a file • This hierarchy supplies location specific data.
This should be not taken to mean that your module cannot have dependencies. You might depend on the apt module to install packages on Debian hosts, or one of Puppet’s many utility modules such as concat and staging. Your module may also be dependent by necessity on functionality provided by other modules. For example, your web service might need to have a web-server. The key to modularity in this case is that while your module might need a web-server, your module doesn’t concern it’s self with deploying a web-server.