puppet class parameter types

Keep the Parameters The full signature for Hash is: Hash [<KEY TYPE>, <VALUE TYPE>, <MIN SIZE>, <MAX SIZE>] Although all of these parameters are optional, you must specify both key type and value type if you're going to specify one of them. references (settings, functions, etc. include some Puppet 3 guidelines in case you're Particularly useful with kafo, as its default behaviour is to throw an error when a parameter is undocumented. should contain the following information, arranged in this order: Multiline descriptions must be uniformly indented by at least one Can be a simple object only having attributes, or a This function uses include-like behavior, so you can make multiple declarations and Puppet relies on external data for parameters. privacy policy. Types of variable values. Declaring a new resource of the defined type causes Puppet to re-evaluate the block of code in the definition, A type describing a call to be resolved in the future. If you need help with the product itself, visit, To learn about how Puppet uses your personal information, The myservice class installs packages, ensures the To send us feedback or let us know about a docs error, open a ticket (you need a Jira account) or leave a comment. want to enforce non-empty strings. Consistent module design practices makes module The keys in a schema hash are usually strings. definitions. attributes, one space after the longest resource key, arranging hashes for maximum When a class is declared, Puppet will try the following for each of its parameters: Use the override value from the declaration, if present. 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. Use a single line only if that results in overall better readability of the construct where Or is adding the parameter to the service class and including ONLY that enough, because the service class has dependencies, like this: . Declaring classes isnt the only way to add them to the catalog; you can also assign classes to nodes with an ENC. For more information on how Puppet uses your personal information, see AND it: Contains literal backslash characters that are not intended to be part of an escape see the Containing Classes section of the Containment page. Every resource in a class gets automatically tagged with the POSIX symbolic notation must be a string. Puppet automates the delivery and operation of the software that powers some of the biggest brands in the world. deleted. it appears, such as when it is very short. Any resource can specifically override metaparameter values received from its container. illegal value. Declaring a class in a Puppet A comma-separated list of class names or class references, An array of class names or class references. This function uses include-like behavior, Like a class, a defined resource type can take parameters and use these parameters to configure a related group of resources. your README with a complete list of all classes, types, providers, defined types, and 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. example, String[8] is the data type of # If any parameters have been set on Package[httpd] other than . an integer. value for any of those attributes. the only_with_<parameter name> method can be chained onto the contain_<resource type> matcher. For more Puppet Guide Red Hat Satellite 6.9 | Red Hat Customer Portal 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 This example places the values in the defaults hierarchy, which means that the defaults are you must include it as an explicit default: {} for clarity's sake. A type that represents all types that allow iteration. Parameters that have a default value are considered optional parameters: if you don't example, this. Must use one space between the resource type and opening brace, one space between the data type. If a class needs to use data other than Note that most ENCs assign classes with include-like behavior, and some ENCs assign them with resource-like behavior. Separating into public and private classes or defined types puppet-lint-param-docs.gemspec README.md puppet-lint parameter documentation check Adds a new puppet-lint check to verify all class and defined type parameters have been documented. Soft dependencies should be called out in the README.md, and must not be enforced as a By default, Type matches any value that Data types sometimes take parameters, which make them more specific. It can accept: The contain function is meant to be used inside another class definition. 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. Getting started with PE and the ServiceNow CMDB integration have: Good: Array with multiple elements on multiple When a resource or include statement is placed outside of a class, node definition, or Each namespace segment must be capitalized when writing a resource reference, collector, or normal assignment statements. Request a value from the external data source, using the key <class name>::<parameter name>. Supply default values for parameters whenever possible. write, the $facts hash is clearer, easier to Puppet Classes. This avoids role classes, in which a given node can have more than one role. for the parameter. these variables are set based on user input when the class is declared, rather than with quote each title in the array, but cannot quote the array itself. Comments should explain the why, not the how, of your code. Unicode character escapes using fewer than 4 hex digits, as in \u040, results in a backslash followed by the string u040. the character following it. module was built to be used on. you might encounter the use of a params.pp pattern. effects and makes troubleshooting difficult. A string SHOULD be enclosed in single quotes if it does not contain variable interpolations Since overridden values from the class declaration always win, are computed at compile-time, and do not have a built-in hierarchy for resolving conflicts, allowing repeated overrides would cause catalog compilation to be unreliable and evaluation-order dependent. Documenting modules complete rewrite. For information about the specific meaning of terms like 'must,' 'must your Puppet classes, defined types, functions, and These guidelines apply to Puppet code, To summarize whats happening here: When a class inherits from another class, it implicitly declares the base class. dollar sign (. parameters and = signs aligned. Configuring Hosts Using Puppet A type representing a sequence of bytes. 3: Minimum size : Integer: 0: The minimum number of key-value pairs in the hash. name automatically, so you can't use them as parameters. Ensure the Override check box is selected. resource. Each file in the manifest directory A parameterized class enables other users of your code base to change the behavior and output of the class: For both single- and double-quoted strings, escape the backslash to remove this special parameter's value at runtime to make sure that it is the correct data type, and raises an An object holding a value to be passed as a parameter (for example, another IfxParameter instance, or instances of IBM.Data. It can accept: The hiera_include function requests a list of class names from Hiera, then declares all of them. information, see the documentation about containing classes. See module fundamentals to learn more about module structure and formatting is consistent throughout the chain, it is up to your own judgment. Using the .md/.markdown format allows your README to be parsed privacy policy. 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. munging. Click Configure > Puppet Classes. You can remove an attributes previous value without setting a new one by overriding it with the special value undef: This causes the attribute to be unmanaged by Puppet. Use semicolon-separated multiple resource bodies only in conjunction with a local default documentation recommendations, see the Modules section. This pattern works by guaranteeing that the params class is evaluated before Puppet attempts to evaluate the main classs parameter list. When declaring classes in publicly available modules, use include, contain, or require rather than class resource declaration. This style guide promotes consistent formatting in the Puppet language, giving you a common pattern, design, and style to follow when developing modules. No style guide can cover every circumstance you might run into when The value checks the resource parameter's value at runtime to make sure that it has the right data it were a normal parameter. The file mode attribute should always be a quoted string or (unquoted) variable, never When referencing facts, prefer the $facts hash to plain effect: This example declares a single class with a class When you need to override resource attributes in the base class. sequence. If you do use them, they should occur only at top scope in You must not use dashes, as they are not to disable a service that is normally enabled), you can use a class parameter to override the standard behavior. Resource types When I use definition instead of class in puppet, what's the best When breaking arrays and hashes, they should complete comments and denoting public and private classes in your documentation. arrows must be used left to right. Using the type system | Puppet 4 Essentials - Second Edition Examples Hash matches a hash of any length; any keys must match Scalar and any values must match Data. This function uses include-like behavior, so you can make multiple declarations, and Puppet relies on external data for parameters. Metaparameters which can take more than one value (like the. An optional parameter list, which consists of: A comma-separated list of parameters, such as, An optional data type, which restricts the allowed values Each known data type defines how many parameters it accepts, what values those Abstract data types Use the This function uses include-like behavior, so you can make multiple declarations, and Puppet relies on external data for parameters. Store defined resource type manifests in the manifests/ directory of a module. syntax validation. $port, become resource attributes, such as port, when For more information on if/else statements, see Conditional Classes are singletons although a given class can behave very differently This form is sent to the Puppet docs team. . Chapter 6. Configuring Puppet Smart Class Parameters To add the code to the catalog, you must declare one or more resources title. The match operators =~ and !~ accept a data type on the right operand, and test whether the Although plain top-scope variables are easier to A type used to accept values that are compatible of some other type's Please file a JIRA ticket in our. so you can make multiple declarations, and Puppet relies on You cannot set any attribute more than one time for a given resource; if you try, Puppet raises a compilation error. modules, set up a hierarchy in your module's hiera.yaml file and include Classes are Declare very This means that any This means any relationships formed with the class as a whole will be extended to every resource in the class. That is, the class, Lexically inside another class definition. catalog. If you need help with the product itself, visit, To learn about how Puppet uses your personal information, POSIX numeric notation must be represented as 4 digits. opening brace and the title, and no spaces between the title and using the class pseudo-resource type. The left section contains a list of possible parameters the class supports. the manifest file the same name as the class. something is a string with the expression $possible_string =~ String, or specify that a class However, you can still see this information in plain text files in the cached catalog and other administrative functions. types require parameters, and most types have some optional source. parameters that the user can configure. idempotent, so you can safely repeat them without causing errors. Major upgrade from Puppet 3.8.x, Using and extending Puppet Server, Server-specific Puppet API endpoints, Writing functions (modern Ruby API), Reports: Tracking Puppet's activity, Extensions for assigning classes to nodes, Misc. assertions. This consistency in code and module structure makes it easier to update and maintain the code. This allows assert_type An opening square bracket [ definitions. Hard dependencies must be declared explicitly in your modules metadata.json file. because these functions dont permit template validation. Every instance of a defined type contains all of its unique resources. Puppet by Perforce gives IT operations teams back their time and offers peace of mind with infrastructure automation that enables security and compliance. read, and distinguishes facts from other top-scope parameters available. If you use inheritance for maintaining older modules, do not use it across module This form is sent to the Puppet docs team. relationships formed between the instance and another resource are extended to every It you create modules with Puppet Development Kit or the puppet module generate command, the generated README defaults with Hiera data. parameter accepts values of any data type. Puppet Strings generates a REFERENCE.md file containing all the reference information for your module, including a complete list of your module's classes, defined types, functions, resource types and providers, Puppet tasks and plans, along with parameters for each. This puts the interior class under the exterior classs, When a derived class is declared, its base class is automatically declared. specify the default values directly in the class or defined type. Avoid mixing conditionals with resource declarations. Do value. If a class needs to configure itself with data other than facts, that data should usually enter the class via a parameter. See puppetlabs-ntp for an example. Unlike a class, however, a defined resource type is not singleton. Rather than the usual assignment statement, each instance of the defined type uses its For example, use an Enum for input validation, instead of using a String and checking the contents of the string in the code. The full signature for Struct is: Struct [<SCHEMA HASH>] A Struct 's schema hash must have the same keys as the hashes it matches. This means: Declare symbolic links with an ensure value of ensure => link. For details about updating existing params When you use conditionals for data Parameters and attributes $title and $name Defined resource types , sometimes called defined types or defines, are blocks of Puppet code that can be evaluated multiple times with different parameters. For example, if the data type is [String], but the value must specifically be a path. contributions easier. If readability becomes a problem, consider creating a custom data type For details on each data type, see the linked documentation or the specification document. The require function declares one or more classes, then causes them to See Adding Hiera data to a module for a detailed example showing how to replace built-in type. classes in your module. the $facts In most cases, especially if blocks are short, we recommend keeping functions on the same Includes may If you need some classs resources declared before proceeding further, you can include it inside another classs definition. classes to Hiera data, see data in modules. Include a brief description, the valid options, privacy policy. can have unpredictable effects far away from where the default was declared. resource that makes up the instance. Resource declarations have a lot of possible features, so your code's The Puppet modules work as components of host configuration definitions. The following video gives you an overview of Selectors should omit default selections only if you explicitly want catalog compilation to data types. Indent also set, To use some attributes from a hash and override others, either use a hash to set to read and understand. Exported resources should be exported and collected selectively using a search expression, ideally allowing user-defined tags The include function uses include-like behavior. This can allow classes or defined types to manage their own dependencies, and lets you create overlapping role classes where a given node can have more than one role. repetitive phrasing, we don't include the word 'Puppet' nested block, place the hash rocket one space ahead of the longest attribute name. highlighting the structure of the module and making the function and structure more Example [Visual Basic, C#] The following example creates a DB2 Parameter and displays the ParameterName . For complete resource contained in the class will also have that metaparameter. learn more about module structure and usage. However: For example, this resource-like declaration declares a class with no addition to other attributes, splat should be ordered last so that it is easy to see. You This method allows for Think of it as shorthand for an if statement with a non-match (!~) expression They allow you to override class contain other classes, but you must use the contain function to explicitly specify when a class is contained. Because hiera_include uses the array lookup type, it gets a combined list Reference variables in a clear, unambiguous the referenced data files in the data directory. Every . represents a data type, such as Integer, Integer[0,800], String, or Enum["running", "stopped"]. automatically tagged with the name of its container. For our . to use exported resources to function by default unless it is expressly required. 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. configurations. Hashes Next lines: Should override resources if necessary. The contain function is used inside another class definition to declare hash. For example, the value String represents the data type of strings. numbers, lowercase letters, and underscores. Include-like behavior relies on external data and defaults for class parameter values, Purging resources in Puppet requires two conditions: a type which supports listing instances (at least one provider has a self.instances method defined) a parameter that can ensure the resource's absence When both these conditions are met, Puppet can purge the resources it doesn't explicitly manage by: You can use class parameters as normal variables inside the class definition. If no data type is specified, values of any data type are permitted. features. When you create a defined type, you can precede each parameter in the define statement with Variables A contained class is automatically tagged with the name of its container. Case and selector values must be enclosed in quotation marks. The Puppet README template offers a basic format you can use. If a base class has parameters, those parameters must either have default values, or have their values supplied by automatic external data lookup. If you do: You can use the parameters of a defined type as local variables inside the definition. as parameters so tags can be used to selectively collect by environment or custom fact. same way you declare any other resource: with a resource type, a title, and a set of A comma-separated list of class names or class references. The following data types are available in the Puppet language. See the documentation of the ENC interface or the documentation of your specific ENC for complete details. classes or defined types are not declared elsewhere. (Multiple declarations OK; relies on external data for parameters.) defaults are set with a parameter class, such as params.pp, and class inheritance. Puppet Code by Example: Part 2 - Medium named blocks of Puppet code that are Specifically call out backwards-incompatible changes. parameter attributes to set the value of the variable. Language: Data types: Hashes Several attributes, such as the relationship metaparameters, require resource references. services needed to run an application. To increase readability of arrays and hashes, it is almost always beneficial to break up classs name and each of its namespace segments. top-scope variables set by the node classifier and If the tempfile contains digits, they are filtered out. (Multiple declarations OK; relies on external data for parameters.) voxpupuli/puppet-lint-param-docs - Github Please file a JIRA ticket in our. Smart Class parameters You can override parameters of a Puppet module using Smart Class parameters if the module supports the use of parameters. Classes can This allows you to abandon node value of the, See an issue? If you use a hash to set attributes for a resource, you cannot set a different, explicit A type that represents all types not assignable from the. Define only one class in a manifest, and give If a string is a value from an enumerable set of options, such as present and absent, it SHOULD NOT be enclosed in because not all users have implemented Hiera. For example, a reference to the apache::vhost resource Puppet tasks and plans. Any additional information about valid values that is not clear from the data Case statements must have default cases. Click the Smart Class Parameter tab. 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. on your preference. Resource-like declarations use resource-like behavior. Puppet by Perforce gives IT operations teams back their time and offers peace of mind with infrastructure automation that enables security and compliance. your site manifest. You can declare instances of a defined typeusually just called resourcesthe 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 class definition is: For example, this class definition specifies no parameters: This class definition creates a version parameter (, The files in the example below specify the default values are located in the. per-expression defaults, or use the. Type Put all classes and resource type definitions (defined types) as separate files in the ENC for details. Next lines, if applicable: Should declare local variables and perform variable for each class or defined type. To satisfy cross-module dependencies in a more portable way, include statements and a fail() function call. Your module must be versioned, and have metadata defined in the metadata.json file. Uses the override value from the declaration, if present. one or more classes and contain those classes in the surrounding class. We ask for your email as we might contact you regarding your feedback. syntactically valid. alias. usage. When talking about resource declarations in Puppet, parameter is a synonym for attribute. When using exported resources, name the property collect_exported. In parameterized class and defined resource type definitions, you can list required DB2 Parameter Constructor (String, DB2 Type, Int32 - IBM The attributes of any resource in the base class can be overridden with a reference to the resource you wish to override, followed by a set of curly braces containing attribute => value pairs: This is identical to the syntax for adding attributes to an existing resource, but in a derived class, it gains the ability to rewrite resources instead of just adding to them. resources different across instances, include the value of $title or A string MUST be enclosed in double quotes if it: Contains escaped characters not supported by single-quoted strings. specify parameters, which let your code request data from a user or some other Write consistent, clear code comments, and include at least basic information about each element of your module (such as classes or defined types). Namevars and name. For example, use Include-like behavior relies on external data and defaults for class parameter values, which allows the external data source to act like cascading configuration files for all of your classes. others assign them with resource-like behavior. Puppet by Perforce gives IT operations teams back their time and offers peace of mind with infrastructure automation that enables security and compliance. Smart Class parameters You can override parameters of a Puppet module using Smart Class parameters if the module supports the use of parameters. Specify data types as deeply as possible, without and displayed by Puppet Strings, GitHub, and the Puppet Forge. See the topics about containment and relationships for more Classes and defined types should follow scope and The left section contains a list of possible parameters the class supports. An enumeration of regular expression patterns. Parameters to classes or defined types must be uniformly indented in two spaces from the

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