Puppet require - failure handling

[Johan Martinez]

If I define a wordpress class with require functions as below:

class wordpress { require apache require mysql ... }

Then would it run even if apache or mysql classes fail for some reason? Also, if apache class returns an error, would mysql class run get triggered or Puppet would exit after apache class error?

-jM

[Jose Luis Ledesma]

There is not after or before when puppet applies a manifest if there are not dependencies explicitly declared. In the example you have written mysql and apache will be applied in no particular order between them, but will be implemented both before any other resource in the WordPress class.

If you want mysql or apache implemented before the other, you can chain classes:

Class['mysql']=>Class['apache']

This will apply mysql before apache, and only will implement apache if mysql goes OK.

[Andreas Ntaflos]

On 2014-01-05 11:37, Jose Luis Ledesma wrote:
> There is not after or before when puppet applies a manifest if there are not dependencies explicitly declared. In the example you have written mysql and apache will be applied in no particular order between them, but will be implemented both before any other resource in the WordPress class.
>
> If you want mysql or apache implemented before the other, you can chain classes:
>
> Class['mysql']=>Class['apache']

To be syntactically correct that should be

Class['mysql'] -> Class['apache']

with a -> and not a =>.

Andreas

[Jose Luis Ledesma]

Right! I wrote it from the mobile :s

[neubyr]

That explains how resource ordering works. Is it the same way with require statement? For example, if apache or mysql class fails on the node, would wordpress class run be attempted? 

On Sun, Jan 5, 2014 at 8:50 AM, Jose Luis Ledesma <joseluis...@gmail.com> wrote:

Right! I wrote it from the mobile :s

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[Jose Luis Ledesma]

Clases WordPress requiere both MySQL and apache, so no resource of WordPress will be "executed" if any of them fails

[jcbollinger]

On Sunday, January 5, 2014 1:05:01 PM UTC-6, neubyr wrote:

That explains how resource ordering works. Is it the same way with require statement? For example, if apache or mysql class fails on the node, would wordpress class run be attempted? 

Resource and class ordering are the same thing.  One framework governs them both.  You can even order resources relative to classes.  Furthermore, a 'require' statement is exactly equivalent to an 'include' statement plus one or more relationship declarations.  That is this

class wordpress {
  require 'apache'
}

is exactly equivalent to

class wordpress {
  include 'apache'
  Class['apache'] -> Class['wordpress']
}


John

[Johan Martinez]

Thanks Jose!