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SQL
 
 

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Database schema

The database should contain a table 'config' with 3 text columns, path, key & value. Path is equivalent to the path in the hierarchy (with no file extensions), key is the hiera key and value should contain the value in JSON format.

Example:

path key value
'fqdn/foo.example.com' 'class::num_param' '42'
'fqdn/foo.example.com' 'class::str_param' '"foobar"'
'fqdn/bar.example.com' 'class::array_param' '[1, 2, 3]'
'fqdn/baz.example.com' 'class::hash_param' '{ "key1": "value1", "key2": 2 }'

SQL:

CREATE DATABASE hiera WITH owner=hiera template=template0 encoding='utf8';
CREATE TABLE config (path varchar, key varchar, value varchar, UNIQUE(path,key));

Configuration

The backend configuration takes a connection hash that it sends directly to the connect method of the postgres library. See the ruby-pg documentation for more info on parameters it accepts.

Here is a example hiera config file.

---
:hierarchy:
  - 'fqdn/%{fqdn}'
  - common

:backends:
  - psql

:psql:
  :connection:
    :dbname: hiera
    :host: localhost
    :user: root
    :password: examplepassword

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PostgreSQL backend for Hiera

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