hiera 5 postgresql backend

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Matt Zagrabelny

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Apr 13, 2022, 10:30:24 PMApr 13
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Greetings,

I'm running puppet 5.5.

Is anyone aware of a hiera 5 Pg backend?

I've tried getting the hiera 3 module [0] working, but am struggling. I'm hoping a native hiera 5 will be a smoother experience.

Thanks for the help!

-m



Martin Alfke

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Apr 14, 2022, 2:21:41 AMApr 14
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Hi,

We usually recommend to not use any other backend, except for file based backends, due to performance.
Any other backend must be able to deliver the same lookup speed.
We did a calculation at a customer and we saw hiera answering 8000 queries in less than 1 second using the yaml file backend.

With hiera5 you can of course write new backends.
Please note that the hiera3 backends are not compatible with hiera5!

Hth,
Martin


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Matt Zagrabelny

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Apr 15, 2022, 1:34:39 PMApr 15
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Hi Martin,

Thanks for the email. I understand your concerns about using other backends. We have a reasonably small puppet deployment, so I think I will try a DB based backend and see how it performs.

In that light, I've downloaded a hiera-mysql2 module from github and installed it at:

# tree /usr/share/puppet/modules/hiera-mysql2
/usr/share/puppet/modules/hiera-mysql2
├── CHANGELOG.md
├── lib
│   └── puppet
│       └── functions
│           └── mysql2_lookup_key.rb
├── LICENSE
├── metadata.json
└── README.md

I've updated my /etc/puppet/hiera.yaml to include an entry for looking up data using hiera-mysql2:

# head /etc/puppet/hiera.yaml
version: 5

defaults:
    datadir: /etc/puppet/code/hiera
    data_hash: yaml_data

hierarchy:
    - name: "MySQL lookup"
      lookup_key: mysql2_lookup_key
      options:

And I've restarted my puppetmaster.

When I attempt a lookup, either locally on the puppet master (or on an client system via puppet agent -t), I get:

# puppet  lookup foo::bar --explain
Searching for "lookup_options"
  Global Data Provider (hiera configuration version 5)
    Using configuration "/etc/puppet/hiera.yaml"
    Hierarchy entry "MySQL lookup"
Unable to find 'lookup_key' function named 'mysql2_lookup_key' (file: /etc/puppet/hiera.yaml)

I did not use "puppet module" to install the module, I just copied the files to the directory.

My module path looks good. Notice the last entry in the following path output...

# puppet config print modulepath
/etc/puppet/code/environments/production/modules:/etc/puppet/code/environments/production/profiles:/etc/puppet/code/environments/production/roles:/etc/puppet/modules:/etc/puppet/profiles:/etc/puppet/roles:/usr/share/puppet/modules

Can anyone help me understand why the puppetmaster isn't seeing the hiera-mysql2 module (and function contained therein) ?

Thank you for your consideration.

-m

Matt Zagrabelny

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Apr 15, 2022, 3:17:05 PMApr 15
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A little bit more information...

puppet module list does not list the module:

# puppet module list | tail
/usr/share/puppet/modules
├── crayfishx-hiera_mysql (v3.0.1)
├── nanliu-staging (v1.0.4)
├── puppetlabs-apt (v6.1.1)  invalid
├── puppetlabs-concat (v5.1.0)  invalid
├── puppetlabs-mysql (v5.3.0)
├── puppetlabs-postgresql (v5.4.0)
├── puppetlabs-stdlib (v5.0.0)  invalid
├── puppetlabs-translate (v1.1.0)
└── puppetlabs-vcsrepo (v3.0.0)
 
However, it exists on disk:

# ls -1 /usr/share/puppet/modules
apt
concat
hiera_mysql
hiera-mysql2
mysql
postgresql
staging
stdlib
translate
vcsrepo

Any ideas how to get puppet to see the modules that exist "on disk" ?
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