Using hiera-data for a specific node

[Matthias Viehweger]

Hi list!

I have a problem integrating puppet and hiera.

Our puppet-master and all nodes are running puppet 3.6.2. On the master,

hiera version 1.3.4 is installed.

I want to use some hiera-data in a class depending on the node. To be

less abstract, I have this class:

  class memcached::server{

    $cap = hiera('memcached.cap', 64)

    # package and service omitted here

    if is_integer($cap) {

      file { '/etc/memcached.conf':

        ensure     => present,

        content    => template('memcached/memcached.conf.erb'),

        notify     => Service['memcached'];

      }

    } else {

      fail("memory \$cap should be an integer")

    }

  }

In a future refactoring, I may promote $cap to be a class-parameter

and also use the validation from the stdlib.

But first, I want to get 'memcached.cap' from a node-specific file.

Puppet is configured with "hiera_config = /etc/puppet/hiera.yaml".

The file /etc/puppet/hiera.yaml is as follows:

  ---

  :backends: yaml

  :yaml:

    :datadir: /var/lib/hiera

  :hierarchy:

    - %{clientcert}

    - common

  :logger: console

This is - from the docs - the internal default with just one hierarchy added.

I do not have the value "memcached.cap" in the /var/lib/hiera/common.yaml

I do have a file /var/lib/hiera/shop-01.hoster.de which contains

  memcached.cap: 256

Using this configs manually via the CLI, I get the expected result:

  $ sudo hiera memcached.cap -d -c /etc/puppet/hiera.yaml -y /var/lib/puppet/yaml/facts/shop-01.hoster.de.yaml

  DEBUG: Wed Jul 23 18:49:39 +0200 2014: Hiera YAML backend starting

  DEBUG: Wed Jul 23 18:49:39 +0200 2014: Looking up memcached.cap in YAML backend

  DEBUG: Wed Jul 23 18:49:39 +0200 2014: Looking for data source shop-01.hoster.de

  DEBUG: Wed Jul 23 18:49:39 +0200 2014: Found memcached.cap in shop-01.hoster.de

  256

So far, everything is nice. BTW, when I change the %{clientcert} to

%{::clientcert} is does work through the CLI anymore.

I cannot get the same data through puppet.

What am I doing wrong? Where - apart from the source-code - can I look

for information how that lookup works?

Thanks,

Matthias Viehweger

[Atom Powers]

Is the value of "256" being resolved by puppet as a string?

That would cause your "is_integer" test to fail.

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[Matthias Viehweger]

Am Mittwoch, 23. Juli 2014 19:13:47 UTC+2 schrieb Atom Powers:

Is the value of "256" being resolved by puppet as a string?

That would cause your "is_integer" test to fail.

Well, if that test fails, then my core problem - getting the data at all - is solved. 

I expect that the conversion from YAML-types to Puppet-types is lossless in this case, because ruby does the right thing here and puppet would need to make an effort to get it wrong ;-)

But that would be a nice catch. thanks, Atom Powers.