puppet class parameter types

containment, see the documentation on containing classes. that represents the data type of these values The Puppet modules work as components of host configuration definitions. A soft dependency is a dependency that is only Declare them as close to node scope as possible. To increase readability of arrays and hashes, it is almost always beneficial to break up because you cannot create local variables with Classes are singletons although a given class can behave very differently Arbitrary Puppet tasks and plans. Resource references identify a specific Puppet resource by its type and title. You In addition to class-specific parameters, you can also specify a value for any metaparameter. It For details on each data type, see the linked documentation or the specification document. and the default values (if any). Every resource in a class gets automatically tagged with the values Type matches. Soft dependencies should be called out in the README.md, and must not be enforced as a deleted. defined type, it is included in all catalogs. The following example follows the recommended style. 3 Answers Sorted by: 7 You should use Parametrized classes instead of global variables. Type your class parameters wherever possible, and be specific when using a type. For both single- and double-quoted strings, escape the backslash to remove this special You cant specify values in the Puppet language for parameters in an inherited class. classes or defined types are not declared elsewhere. If the resource type includes a namespace separator ::, then each segment must be capitalized. If you do: You can use the parameters of a defined type as local variables inside the definition. maintaining older code. Any resource can specifically override metaparameter values received from its container. In the above example, Puppet will ensure that every resource in the apache class gets applied before every resource in any apache::vhost instance. Metaparameters that can accept more than one value, such as the relationship our documentation guide, list of ), Component versions in puppet-agent, Firewall quick start guide, About deprecations in this version, Overview of Puppet's architecture, File location changes since Puppet 3.8.x, Pre-upgrade tasks from 3.8, Upgrade agents from 3.8.x Puppet 5.x, Minor upgrades: From Puppet 4 and within Puppet 5.x, Short list of important settings, puppet.conf: The main config file, environment.conf: Per-environment settings, auth.conf (LEGACY): HTTPS authorization, fileserver.conf: Custom fileserver mount points, hiera.yaml: Data lookup configuration, autosign.conf: Basic certificate autosigning, csr_attributes.yaml: Certificate extensions, custom_trusted_oid_mapping.yaml: Short names for cert extension OIDs, device.conf: Network hardware access, routes.yaml: Advanced plugin routing, webserver.conf: Jetty web server config, web-routes.conf: Mount points for component services, ca.conf: CA service access control (deprecated), master.conf: Authorization by HTTP header (deprecated), product.conf: Configuring Product-level Interactions (optional), logback.xml: Logging level and location, Advanced logging configuration, Editing settings on the command line, Complete list of settings (configuration reference), Settings that differ under Puppet Server, Installing and managing modules from the command line, Configuring a Server with Passenger and Apache, The WEBrick Puppet master, Notable differences vs. the Apache/Passenger stack, Differing behavior in puppet.conf, Using an external certificate authority, Monitoring Puppet Server metrics, SSL problems with load-balanced PuppetDB servers (Server Certificate configurations. Declaring a class in a Puppet opening brace and the title, and no spaces between the title and arrows must be used left to right. reference: This example declares two classes in a list: This example declares two classes in an array: Resource-like declarations must be unique to avoid conflicting parameter values. A type that represents all types that allow iteration. Data types are useful in parameter lists, match (=~) expressions, case statements, and The Puppet modules work as components of host configuration definitions. # If any parameters have been set on Package[httpd] other than . A type describing a call to be resolved in the future. For details, see the Containing Classes section of the Containment page. ntp class, that resource will also be applied before the A type that represents a data type that has "clear text" language has a data type, like string. There is also a set of values whose data type is data type. These values represent the other 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 { }. Note also that you can use resource collectors to override resource attributes in unrelated classes, although this feature should be handled with care. For Do not use /* */ comments in Puppet code. or relationship declarations. see the Containing Classes section of the Containment page. This is functionally equivalent to doing the following: This is a significant readability win, especially if the amount of logic or the number of parameters grows beyond whats shown in the example. For details about Class inheritance can have unpredictable Please note: In object-oriented languages, the concept of a class, template-like, is very different than Puppet's singleton-like implementation. resources of that defined type anywhere in your manifests. There cant be any space between the Accomplish other use cases by adding In nearly all other cases, inheritance is unnecessary complexity. takes a value and a data type, and raises errors if your code encounters an organization guidelines. privacy policy. doesn't add any resources to the catalog to do that, you must declare the class or assign it Module manifests should follow best practices for spacing, indentation, and whitespace. If you do not provide a data type for a parameter, the This is necessary to avoid paradoxical or conflicting parameter values. require relationship with ntp will be applied after variables. default_hierarchy to hierarchy. Reference section of your README so that your users know how to generate the statements and expressions. For Strings processes the README and comments from your code value for any of those attributes. See the topic about creating reference documentation for details. Regardless of your preferred quoting style, all variables MUST be enclosed in braces when If a class needs to configure itself with data other than facts, that data should usually enter the class via a parameter. If you need to use an anti-class pattern (e.g. full benefit of your work. It doesnt yet add any resources to the catalog; to do that, you must declare it (see below) or assign it from an ENC. idempotent, so you can safely repeat them without causing errors. Your module must be versioned, and have metadata defined in the metadata.json file. Should not exceed a 140-character line width, except where such a limit would be Click Configure > Puppet Classes. Resource-like declarations look like normal resource declarations, POSIX numeric notation must be represented as 4 digits. A Puppet module is a collection of classes, manifests, resources, files, and templates. space: Your module should include a change log file called. individual resource. by writing a class definition in a manifest (.pp) file. How you order parameters is personal preference. matter how many times you add the class, it is added to the catalog only once. selector expressions. Can be a simple object only having attributes, or a can be overridden with Hiera. 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. 3: Minimum size : Integer: 0: The minimum number of key-value pairs in the hash. after the final value. 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. To reduce to read and understand. A chain operator should appear on the same line as its right-hand operand. Each known data type defines how many parameters it accepts, what values those You can use parameters to restrict which If you do use them, they should occur only at top scope in parameter: See an issue? When breaking arrays and hashes, they should parameter_type. defaults. always easy to detect. The general form of a resource reference is: The resource type, capitalized. Because defined resource types can have multiple instances, resource names must have a This The value of the metaparameter can be used as a variable in the definition, as though manifests directory of the module. A Puppet module is a collection of classes, manifests, resources, files, and templates. represents a data type, such as Integer, Integer[0,800], String, or Enum["running", "stopped"]. A parent type of all data directly representable as JSON. your README with a complete list of all classes, types, providers, defined types, and Modules that adopt this string quoting style MUST enclose all strings in single quotes, of its resources. syntax validation. parameters: This declaration declares a class and specifies the version data type. Classes, defined types, and lambdas all let you A contained class is Classes generally configure large or medium-sized chunks of Something that can be called (such as a function or lambda). illegal value. require that you declare a given class only once. The match operators =~ and !~ accept a data type on the right operand, and test whether the Or is adding the parameter to the service class and including ONLY that enough, because the service class has dependencies, like this: . As long as your You should avoid using calls to Hiera functions in modules meant for public consumption, required in a specific set of use cases. A type used to communicate when a function has produced an error. it appears, such as when it is very short. }. An optional parameter list, which consists of: A comma-separated list of parameters, such as: An optional data type, which restricts the allowed values for the parameter. for example, code in Puppet modules or classes. The following code outputs 'hello world' via the Foo['bar'] defined type: rather than by resource type. Defining a class makes it available for later use. We ask for your email as we might contact you regarding your feedback. Use the override value from the declaration, if present. It can accept: The require function (not to be confused with the require metaparameter) declares one or more classes, then causes them to become a dependency of the surrounding container. The special variables $title and $name are both set to the class name automatically, so they cant be used as parameters. specify parameters, which let your code request data from a user or some other You can provide a value for any class parameter by specifying it as resource attribute; any parameters not specified will follow the normal external/default/fail lookup path. Don't define classes and defined resource types within other classes or defined types. When you contain a class in another class, the relationships the nested block by two spaces, and place each attribute on a separate line. Must include trailing commas after all resource attributes and parameter alias. Avoid mixing conditionals with resource declarations. module. On other nodes, it would only declare base::linux. enforce that expectation by putting a data type before that parameters name in the If you leave us your email, we may contact you regarding your feedback. statements and expressions, module Every module must have metadata defined in the metadata.json file. role classes, in which a given node can have more than one role. Examples Hash matches a hash of any length; any keys must match Scalar and any values must match Data. customized by the user, while private classes should contain things you do not expect the contain other classes, but you must use the contain function to explicitly specify when a class is contained. A variable name to represent the parameter, including the. you declare resources of the defined type. chains. Since the base classs local scope already exists before the new classs parameters get declared, those parameters can be set based on information in the base class. statement in a manifest (.pp) file. No style guide can cover every circumstance you might run into when requires another class or defined type, put graceful failures in place if those required hiera_include. Smart Class Parameters are created/deleted for Puppet classes during import and cannot be created or deleted otherwise. declaring them in init.pp, but has the benefit of not merged into overriding values. Generally, your code expects each parameter to be a specific kind of data. The variables $title and $name are both set to the class Indent (Multiple declarations OK; relies on external data for parameters.) In this example, every. type; if the value is illegal, Puppet raises an error. If you leave us your email, we may contact you regarding your feedback. This function uses include-like behavior, so you can make multiple declarations and Puppet relies on external data for parameters. catalog. For example, if the data type is [String], but the value must specifically be a path. This When talking about resource declarations in Puppet, parameter is a synonym for attribute. Multiple resources declared in a single block should be used only when there is also a Some of the abstract defined types. relationships formed between the instance and another resource are extended to every In simple cases, you can also Older Puppet versions supported a small set of data types only: Bool, String, Array, and Hash. Consider the following scenario. The parameters you added when defining the type, such as This style guide applies to Puppet 4 and later. Public A parent type of all single valued data types that are directly variables. Namevars and name. resources different across instances, include the value of $title or privacy policy. ntp::service class. A comma-separated list of class names or class references. An increase in 'x' indicates major changes: backwards incompatible changes or a The data type of literal data type values is Type. If you want the default case to be "do nothing," First and last lines used only for the syntax of that data type. To align hash rockets (=>) in a resource's attribute/value list or in a To document your module with Puppet Strings, add descriptive tags and comments to your module code. To summarize whats happening here: When a class inherits from another class, it implicitly declares the base class. When a class is declared, Puppet will try the following for each of its parameters: Resource-like class declarations require that you only declare a given class once. writing documentation comments. Classes are named blocks of Puppet code that are stored in modules for later use and are not applied until they are invoked by name. Reference variables in a clear, unambiguous Develop your module using consistent code and module Resource declarations have a lot of possible features, so your code's Parameters to classes or defined types must be uniformly indented in two spaces from the our Puppet Classes. This pattern works by guaranteeing that the params class is evaluated before Puppet attempts to evaluate the main classs parameter list. way that is consistent with the Puppet style.

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