Hiera is a key/value lookup tool for configuration data. Hiera makes Puppet better by keeping site-specific data out of your manifests. Puppet classes can request whatever data they need, and your Hiera data will act like a site-wide config file.
- Hiera 3.0 is included with open source Puppet versions 4.2 and up.
- Hiera 1.0 is compatible with Puppet 3.x and is included in Puppet Enterprise 3.x.
- Hiera 2.0 is included with open source Puppet versions 4.0 through 4.1.