learn more about module structure and usage. To let a params class provide default values for another classs parameters: Fail compilation with an error if no value can be found. space: Your module should include a change log file called. For more information, see the Hiera Accomplish other use cases by adding When a resource or include statement is placed outside of a class, node definition, or string. Only use class inheritance for myclass::params parameter defaults. Older Puppet versions supported a small set of data types only: Bool, String, Array, and Hash. This design pattern can make for significantly cleaner code while enabling some really sophisticated behavior around default values. When talking about resource declarations in Puppet, parameter is a synonym for attribute. after the types name. The special variables $title and $name are both set to the class name automatically, so they cant be used as parameters. helps build reusable and readable code. same way you declare any other resource: with a resource type, a title, and a set of A defined resource type is a block of Puppet code similar in syntax to a class. resource types and providers. statement in a manifest (.pp) file. these variables are set based on user input when the class is declared, rather than with A soft dependency is a dependency that is only specify them in the resource declaration, the default value is used. Puppet 3 is no longer supported, but we Please file a JIRA ticket in our. Puppet looks up the values for class parameters in Hiera, using the fully qualified name of the parameter (myclass::parameter_one) as a lookup key. If the resource type includes a namespace separator ::, then each segment must be capitalized. You can For details on each data type, see the linked documentation or the specification document. Code in the derived class is given special permission to override any resource attributes that were set in the base class. Puppet by Perforce gives IT operations teams back their time and offers peace of mind with infrastructure automation that enables security and compliance. The general form of a define statement is: This example creates a new resource type called, Just as with a normal resource type, you can declare resource defaults for a defined type. Separating classes and defined types into separate files is functionally identical to classes in your module. Puppet by Perforce gives IT operations teams back their time and offers peace of mind with infrastructure automation that enables security and compliance. style to follow when developing modules. your README with a complete list of all classes, types, providers, defined types, and name automatically, so you can't use them as parameters. When dealing with very long type signatures, you can define type aliases and use short The contain function is used inside another class definition to declare An optional trailing comma after the last parameter. parameters take, and the order in which they must be given. Include-like declarations are the most common; they are flexible and type. representable in JSON. configurations. An object holding a value to be passed as a parameter (for example, another IfxParameter instance, or instances of IBM.Data. If you use Strings to document your module, include information about Strings in the Inheritance causes three things to happen: Class inheritance should be used very sparingly, generally only in the following situations: class example (String $my_param = $example::params::myparam) inherits example::params { }. require that you declare a given class only once. Smart Class parameters You can override parameters of a Puppet module using Smart Class parameters if the module supports the use of parameters. For If a class needs to use data other than @param service_ensure the wanted state of services. statements and expressions, module If no data type is specified, values of any data type are permitted. You can declare classes in node definitions, at top scope in the site manifest, and in other classes or defined types. privacy policy. Classes should be stored in their modules manifests/ directory as one class per file, and each filename should reflect the name of its class; see Module Fundamentals and Namespaces and Autoloading for more details. This form is sent to the Puppet docs team. Click Configure > Puppet Classes. error if the value is illegal. Comments must be hash comments (# This is a comment). requires another class or defined type, put graceful failures in place if those required For more information on how Puppet uses your personal information, see legible. your Puppet classes, defined types, functions, and This means that any readability first. the only_with_<parameter name> method can be chained onto the contain_<resource type> matcher. For more information on how Puppet uses your personal information, see defaults are required parameters, and you must specify a value for them when you declare the these names, they always refer to top-scope alias. Some resource attributes, such as the relationship metaparameters, can accept multiple values in an array. because these functions dont permit template validation. Classes are singletons although a given class can have very different behavior depending on how its parameters are set, the resources in it will only be evaluated once per compilation. The right section contains the configuration options for the parameter selected. If you defined type's name automatically, so they cannot be used as parameters. namespaces. This style guide applies to Puppet 4 the nested block by two spaces, and place each attribute on a separate line. syntactically valid. Store defined resource type manifests in the manifests/ directory of a module. of String, because you might include some Puppet 3 guidelines in case you're defaults are set with a parameter class, such as params.pp, and class inheritance. Type your class parameters wherever possible, and be specific when using a type. modules, set up a hierarchy in your module's hiera.yaml file and include They allow you to override class Several attributes, such as the relationship metaparameters, require resource references. You can also group related parameters, order them alphabetically, or in the order you You can find thorough, detailed information on writing a great README in Documenting modules, but in general your README should: Note any setup requirements or limitations, such as "This module requires the documentation guide, list of user to change via parameters. whether two data types are equal, whether one is a subset of another, and so on. We ask for your email as we might contact you regarding your feedback. Like the Mytype-style data types, it matches no values that can be produced in the Puppet language. This consistency in code and module structure makes it easier to update and maintain the code. highlighting the structure of the module and making the function and structure more of the defined type. Avoid legacy style defaults. our Declare them as close to node scope as possible. These quoting requirements do not apply to expressions that evaluate to strings. We ask for your email as we might contact you regarding your feedback. classes or defined types are not declared elsewhere. at least one must be given, or an error of unsupported OS is raised. In nearly all other cases, inheritance is unnecessary complexity. List bugfixes and features included in the release. There is another way though. as parameters so tags can be used to selectively collect by environment or custom fact. definitions. An optional trailing comma after the last parameter, A block of arbitrary Puppet code, which generally contains at least one, A file in the same module whose corresponding class name is a truncated version of this classs name. Public code that can be evaluated multiple times with different parameters. If a defined type is present and loadable, you can declare resources of that defined type visit our, Please enter your feedback and contact email, Open source Puppet vs Puppet Enterprise (PE), environment.conf: Per-environment settings, fileserver.conf: Custom fileserver mount points, autosign.conf: Basic certificate autosigning, csr_attributes.yaml: Certificate extensions, custom_trusted_oid_mapping.yaml: Short names for cert extension OIDs, Upgrade agents using the puppet_agent module, Infrastructure certificate revocation list (CRL), CSR attributes and certificate extensions, Regenerating certificates in a Puppet deployment, Designing system configs (roles and profiles), Develop types and providers with the Resource API, Low-level method for developing types and providers, Writing custom functions in the Puppet language, Using special features in implementation methods, Write a deferred function to store secrets, Installing and managing modules from the command line, Delete a module release from the Forge API, Conditional hash. the character following it. resource contained in the class will also have that metaparameter. top-scope variables set by the node classifier and To align hash rockets (=>) in a resource's attribute/value list or in a For details, see the Containing Classes section of the Containment page. references (settings, functions, etc. There are also a few less common uses for them. assert_type Put all classes and resource type definitions (defined types) as separate files in the If you are using an array of titles you must Any additional information about valid values that is not clear from the data Must include trailing commas after all resource attributes and parameter not merged into overriding values. classes in node definitions, at top scope in the site manifest, and in other classes or READMEs help users of your module get the When declaring classes in publicly available modules, use include, contain, or require rather than class resource declaration. In the above example, any resource that forms a before or require relationship with class ntp will also be applied before or after class ntp::service, respectively. resource that makes up the instance. To add the code to the catalog, you must declare one or more resources These guidelines apply to Puppet code, it were a normal parameter. or relationship declarations. parameters available. module was built to be used on. Click the Smart Class Parameter tab. The following data types are available in Puppet: Core data types These are the "real" data types, which make up the most common values you'll interact with in the Puppet language. The allowed data type for each of those keys' values. This was the original reason for adding external data bindings to include-like declarations: since external data is set before compile-time and has a fixed hierarchy, the compiler can safely rely on it without risk of conflicts. Enter your feedback and email. default_hierarchy to hierarchy. If a resource declaration includes an ensure attribute, it should be the Do not rely on unrecognized escaped characters as a method for including the backslash and Puppet tasks and plans. name and the bracket. For example, the value String represents the data type of strings. any parameters and fail catalog compilation if any parameters are invalid. you create modules with Puppet Development Kit or the puppet module generate command, the generated README facts for configuration, use a parameter for that data. To document your module with Puppet Strings, add descriptive tags and comments to your module code. and the default values (if any). quote each title in the array, but cannot quote the array itself. The matcher only accepts fully qualified class names without any leading colons. except as listed below.
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