The Tool Desk
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What Puppet code does
Puppet is a declarative domain-specific language for configuration management. Instead of scripting every shell command in sequence, you declare facts such as “this package must be installed,” “this service must be running,” or “this file must contain this content.” Puppet evaluates the declarations, resolves relationships between resources, and compiles a catalog for one node. The catalog is the concrete plan Puppet applies to that node, even when the manifest contains conditionals for many different nodes.
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“Puppet is a tool that helps you manage and automate the configuration of servers.” — Puppet, Introduction to Puppet documentation
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The compile-and-apply flow
- Puppet reads the main manifest and any classes or modules it references.
- It evaluates expressions, conditionals, variables and resource relationships for the target node.
- It resolves the resulting resources into a catalog for that node.
- The agent applies the catalog, changing only resources that do not already match the declared state.
Keeping source manifests separate from compiled catalogs helps you reason about reuse, testing and failures: a syntax problem is found while parsing or compiling, while a package, file or service problem appears when the catalog is applied.
What is a Puppet manifest?
A manifest is a UTF-8 text file whose name ends in .pp. It contains Puppet code such as resource declarations, class definitions, class declarations, variables and conditional logic. Puppet evaluates the main manifest first. In the simplest layout, that file is site.pp; as the codebase grows, it becomes the place where you classify nodes and compose modules rather than a long list of every operating-system detail.
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The following file declares a directory and a service. Resource titles and attributes describe the desired result; Puppet determines the provider-specific operations needed to reach it.
file { '/srv/example':
ensure => directory,
mode => '0755',
}
service { 'example-service':
ensure => running,
enable => true,
}Save it as site.pp in a controlled development environment and apply it with puppet apply site.pp. The command is useful for learning and local testing; production teams commonly compile catalogs through their normal server-management workflow. Run the same manifest again and Puppet evaluates the current state against the declarations instead of blindly repeating an imperative script.
Resources, attributes and relationships
A resource has a type, a title and attributes. Common types include package, file and service. Attributes such as ensure, content, source, enable and require express state and ordering. Relationships are part of the model: a service can require a package, or refresh when a managed configuration file changes. Put those relationships in the manifest or module so the catalog records the dependency explicitly rather than relying on command order.
Classes: define code once, declare it to use it
A class is a named block of Puppet code, normally stored in a module. Defining a class makes the block available; declaring the class adds its resources to the catalog. Confusing those two operations is one of the most common beginner mistakes.
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class motd {
file { '/etc/motd':
ensure => file,
content => "Managed by Puppetn",
}
}
include motdThe class motd block alone does not manage /etc/motd. The include motd declaration is what makes the class part of the node’s catalog. You can also declare a parameterized class with an explicit resource-like syntax when you need to pass values; use one declaration style consistently so the class is not accidentally declared twice.
Classes versus defined types
Classes represent a logical component that is usually included once per node, such as a web server or a monitoring agent. A defined type is a reusable resource-like template that can be instantiated multiple times with different titles, such as several similar virtual hosts. Both belong in module code, but they solve different reuse problems: class inclusion composes a component, while a defined type creates multiple instances of a pattern.
What is a Puppet module?
A module is a reusable directory structure that normally manages one technology or infrastructure task. Modules are Puppet’s basic building blocks. They can contain classes, defined types, tasks, plans, functions, resource types, providers, facts, data, examples and static files. Puppet searches the configured modulepath for these directories and loads their content by module name.
Typical module layout
example_module/
├── manifests/
│ ├── init.pp
│ ├── install.pp
│ └── config.pp
├── files/
├── data/
├── examples/
└── tasks/manifests/: Puppet classes and defined types. Each.ppfile normally contains one class or defined type.init.pp: the conventional entry point for the module’s main class.files/: static files a class can source.data/: module data used to separate values from code where the module’s design supports it.examples/: runnable or illustrative usage for users and maintainers.tasks/: task content when the module provides operational actions in addition to catalog resources.
Not every module needs every directory. Start with manifests/init.pp and add directories only when the component has a clear need. A narrow module is easier to discover and test than a catch-all folder containing unrelated server concerns.
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Put init.pp in the module’s manifests/ directory. It is special because the class inside it is referenced by the module name itself. If the directory is named example_module, manifests/init.pp conventionally contains class example_module { ... }, and you declare it with include example_module.
Other files map to namespaced class or defined-type names. The mapping makes a module’s API predictable:
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| File | Typical name | How it is used |
|---|---|---|
manifests/init.pp |
example_module |
Main class, usually included once |
manifests/install.pp |
example_module::install |
Install-stage class |
manifests/config.pp |
example_module::config |
Configuration-stage class |
manifests/instance.pp |
example_module::instance |
Class or defined type, according to its declaration |
Use lowercase module names and keep the directory name, class namespace and references aligned. A file named config.pp does not become active merely because it exists; the main class must declare it, or the site manifest must declare the namespaced class directly.
Build your first module
Move from a one-file manifest to a module when a group of resources represents one logical component, needs parameters, or will be reused on more than one node.
- Prove the behavior in a small manifest. Declare one or two resources and apply them in a disposable or controlled development environment. Confirm the resulting file, package or service state before adding abstraction.
- Choose one responsibility. Name the module after the technology or infrastructure task it manages. Avoid putting unrelated operating-system policies in the same module simply because they are deployed to the same server.
- Create the standard directories. Start with
example_module/manifests/init.pp. Addfiles/,data/,examples/or other supported content only when the module needs them. - Move the logical resources into a class. Put the component’s declarations in
class example_module { ... }. Split installation and configuration into namespaced classes when that improves readability or lets callers compose stages. - Declare the class from the main manifest. Use
include example_moduleor an explicit parameterized declaration. Defining the class without declaring it leaves the catalog unchanged. - Expose only useful parameters. A parameter should represent a value callers genuinely need to vary, such as a port, package setting or file source. Keep implementation details inside the module.
- Add an example and validate. Show the intended declaration in
examples/, then parse and compile the code in the same environment that will consume it. Test both default values and meaningful overrides.
One manifest or a module-based design?
A single manifest is not wrong. It is often the fastest way to learn Puppet or manage a tiny, one-node experiment. Modules become valuable when the same logic must be reused, owned by several people or installed through a repeatable deployment pipeline.
| Concern | One-file manifest | Module-based design |
|---|---|---|
| Reuse across nodes | Copying or conditional branches can make reuse harder to track. | Classes and defined types can be declared wherever the module is available. |
| Separation of concerns | Files, packages and services often accumulate in one list. | Each module can own one technology or infrastructure task. |
| Discoverability | Behavior depends on finding the right section of a large file. | Namespaced classes and standard directories reveal where code belongs. |
| Dependencies and data | Values and ordering are commonly mixed into the main file. | Module metadata, classes and data directories provide clearer boundaries. |
| Testing and documentation | Examples and tests tend to be ad hoc. | A module can ship examples and be tested as an independent unit. |
| Team or Code Manager workflow | Changes converge on one central file. | Modules fit repository, Puppetfile, Code Manager and r10k workflows. |
There is no official quantitative benchmark that makes one structure universally faster. Choose the smallest structure that preserves clear ownership and reuse, then split a manifest when its conditional logic or resource list becomes difficult to review.
Installing and managing Forge modules
The Puppet Forge is the official repository for reusable modules from Puppet developers and the open-source community. Puppet documentation describes thousands of available modules, but the exact count changes over time; treat that figure as a broad publisher statement rather than a fixed inventory. Forge code saves time, yet teams should still expect to write custom modules for organization-specific policies and applications.
Small installation: the puppet module command
For a small installation, install a published module into the active modulepath with the Puppet command-line workflow:
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puppet module install <author>-<module>Use the exact module name and version shown on its Forge page. If you maintain separate development and production trees, direct the command to the intended modulepath or target directory rather than installing into an arbitrary system location. After installation, declare the module’s documented class in your manifest and compile before applying it to important nodes.
Teams using Code Manager or r10k
Code Manager and r10k users normally manage dependencies with a Puppetfile. A minimal entry identifies the module and the version your environment has approved:
mod 'author-module', '1.2.3'Commit the Puppetfile with your control repository, deploy it through the team’s normal Code Manager or r10k process, and verify that the resulting module directory is on the environment’s modulepath. Pinning a tested version makes deployments reproducible; changing a version should be treated as a code change that is compiled and tested before rollout.
Check the modulepath when Puppet cannot find a class
A successful download does not guarantee that every environment can load the module. Puppet searches its configured modulepath, which can differ between development, test and production. When you see an error that a class or module cannot be found, check the environment’s modulepath first, then confirm that the directory name matches the module name and that the class is declared with the correct namespace.
Keep the main manifest focused
As the module library grows, keep site.pp focused on classification and composition. It should decide which classes belong on a node and pass intentional parameters, while the module owns the package, file, service and dependency details for its component. This division makes node differences visible without forcing every administrator to understand every implementation detail.
- Declare a module once for a node unless its interface explicitly supports multiple instances.
- Use namespaced classes such as
example_module::installwhen a caller genuinely needs stage-level composition. - Keep resource relationships explicit so a configuration file can notify or require the service it affects.
- Document required parameters and provide a working example.
- Review module dependencies and data as part of the same change as the class that consumes them.
Common problems and practical fixes
“I defined the class, but nothing changed.”
Look for a class definition without a declaration. Add include module_name or the appropriate parameterized declaration in the node’s composition code, then compile again.
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“Puppet says the class is already declared.”
The same class may be included through two paths, or it may be declared once with include and again with resource-like syntax. Choose one declaration path and let the module’s main class coordinate its internal classes.
“The module is installed, but Puppet cannot load it.”
Inspect the active environment’s modulepath, directory name and namespace. A module installed for one environment is not automatically available to another. Also check that the class you call actually exists in the expected manifests/ file.
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“The file is in the module, but the node cannot receive it.”
Static content under files/ must be referenced by a resource in a declared class. Merely placing a file in the directory does not add a file resource to the catalog.
“A change applies in one environment but not another.”
Compare the deployed module version, Puppetfile lock or deployment result, modulepath and data values. Environment drift commonly comes from different module versions or from compiling a different control-repository branch.
A practical checklist before sharing a module
- The module has one clearly stated responsibility.
manifests/init.ppcontains the documented main class when an entry point is appropriate.- Each additional manifest file contains one class or defined type with a predictable namespace.
- The main class is declared in an example or test node; a definition alone is not presented as working usage.
- Package, file and service relationships are explicit.
- Static files, data and examples are stored in their conventional directories.
- External module dependencies are recorded in the chosen workflow, whether a local
puppet moduleinstallation or a team-managedPuppetfile. - The module compiles in every environment where it is intended to run, with the expected modulepath and data.
The useful progression is simple: start with a manifest that proves the desired state, extract a class when the component becomes logical, then package that class as a module when reuse, ownership and deployment consistency matter. Puppet’s conventions—.pp manifests, a modulepath, manifests/, namespaced classes and the init.pp entry point—turn that progression into code other people can find and safely compose.
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