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include class vs execute Class

asked 2013-06-28 15:23:04 -0500

BaltoStar gravatar image

updated 2013-06-28 18:56:43 -0500

I am wondering about differences between and pros/cons of the following two approaches to applying classes to a node :

node node1{
  include 'class1'
  include 'class2'

node node2{
  Class['class1'] -> Class['class2']

My understanding is that Class[] -> Class[] forces the classes to be applied in a specific order. So for node2, we have ensured that Puppet will apply class1 before class2.

But I'm sketchy on exactly what Class[] does ...

And what about when just using include ( for node1 ) ? Is an execution order ensured ?

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answered 2013-06-30 20:01:40 -0500

Ancillas gravatar image

updated 2013-06-30 20:05:26 -0500

Here's how I explain it to new Puppet users. If you add a class to the catalog using include, you can not pass in parameters. This limits the flexibility of the class unless you're using a tool like hiera within the class. However, it provides the flexibility of being able to call a class as many times you want throughout your code. You could write include apt a hundred times, and Puppet would never care because if apt had already been included in the catalog, it would just use the already existing copy.

Conversely, calling a class like ... (more)

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answered 2013-06-29 04:44:58 -0500

You have to use class{'class1':} when using parameterized Classes.

include does not support parameters.

With include you have no execution order. Include just loads the code and executes it somewhere in some order.

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answered 2013-06-28 15:51:33 -0500

In Puppet, first one is called include-like and second way is called resource-like. You can read more about it here. I don't think there is any order implied in both cases unless you specify that explicitly or class internal structure causes some dependencies in the catalogue that dictates the order.

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answered 2013-06-28 15:54:08 -0500

updated 2013-06-28 19:30:42 -0500

It's all about consistency and what feels more natural for your team, but there is an article on best practices :

class : include versus resources

Hope that helps.

EDIT : Not sure what would be the purpose of Class['class1'] -> Class['class2']

But you can achieve the same with (the valid, note the ':' ) :

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Strange that docs on resource-like behavior discuss the class{} directive but not the Class[] directive. My understanding is that to ensure that classes are applied in a certain order you ...(more)

BaltoStar gravatar imageBaltoStar ( 2013-06-28 18:46:28 -0500 )edit

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Asked: 2013-06-28 15:23:04 -0500

Seen: 3,992 times

Last updated: Jun 30 '13