Custom functions

Use the Puppet language, or the Ruby API to create custom functions.

For built-in Puppet functions, see the Functions reference.

• 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. A function returns a calculated value from its final expression.

• Writing custom functions in Ruby

  You can write powerful and flexible functions using Ruby.

• Deferring a function

  Deferring a function allows you to run code on the agent during a Puppet run.