Puppet writing custom functions
Custom functions overview Puppet includes many built-in functions, and more are available in modules on the Forge.You can also write your own custom functions. Writing custom functions in the Puppet language You can write simple custom functions in the Puppet language, to transform data and construct values. A function can optionally take one or more parameters as arguments.
Writing custom functions in the Puppet language. Open Source Puppet — 6.18 (latest) Sections. You can write simple custom functions in the Puppet language, to transform data and construct values. A function can optionally take one or more parameters as arguments.
You can use your custom functions locally, and you can also share them with other users. To make a custom function available to Puppet, you must put it it a module or in an environment, in the specific locations where Puppet expects to find functions. Puppet offers three interfaces for writing custom functions:
Custom functions in Ruby overview Get started with an overview of Ruby custom functions. Ruby function signatures Functions can specify how many arguments they expect, and a data type for each argument. The rule set for a function’s arguments is called a signature. Using special features in implementation methods
Writing Custom Function. There are few things which one needs to keep in mind before writing a function. In Puppet, functions are executed by compilers which means all the functions run on Puppet master and they don’t need to deal with any of the Puppet client for the same. Functions can only interact with agents, provided information is in ...
Puppet is automatically aware of functions in a valid module and will autoload them by name. Writing functions in the main manifest. In most circumstances, you store functions in modules. Avoid writing functions in the main manifest, which overrides any functions in all modules with the same name unless it is built into Puppet. Naming a function
Creating Custom Function. Puppet provides newfunction method inside the puppet::parser::Functions module to define the new function. Use any function name with the newfunction method. Let's build a function for writing a string to a file in the directory /tmp:
Writing custom functions in puppet. Published: November 16, 2012 by Abhijeet Rastogi. Categories: Tags: debug 1; puppet 4; ruby 4; WARNING: The content of the post is changed. It was originally written with a different intent. I'll go about creating a custom function that ...
· Let's look at custom functions in a little more detail now and build an example. There are two Ruby APIs available when writing custom functions, the legacy and the modern API. Legacy functions are instantiated with Puppet::Parser::Functions, modern functions are instantiated with Puppet::Functions.create_function.