Hiera-based Puppet ENC

This project acts as a miniature Puppet ENC in YAML files, made accessible by Hiera. This makes server-side node configuration (e.g. environments, custom node parameters) easy to edit in the same way (and same place) as normal Hiera-based Puppet data.

Since an exec-based ENC simply prints out YAML when passed a node name, the script just gets the merged hierarchical data with Hiera and then prints.

Usage

Deploy this repository on the puppetmaster as /etc/puppet/hiera-enc, and add the following lines to puppet.conf:

[master]
    node_terminus = exec
    external_nodes = /etc/puppet/hiera-enc/enc

Node configuration may be made in /etc/puppet/hiera-enc/nodes/<fqdn>.yaml, or defaults set in the default.yaml file.

Check the data returned for a given node by executing ./enc <fqdn>, just as Puppet itself will do. Note that the DEBUG lines are printed to STDERR and are not parsed by Puppet.

Example

Assume the yaml files hostname.example.com.yaml and default.yaml:

---
parameters:
  role: workstation

---
environment: production

When the enc is queried for hostname.example.com, the result is the merged hash of these values:

$ ./enc hostname.example.com
DEBUG: 2014-07-11 13:04:24 +0200: Hiera YAML backend starting
DEBUG: 2014-07-11 13:04:24 +0200: Looking up parameters in YAML backend
DEBUG: 2014-07-11 13:04:24 +0200: Looking for data source hostname.example.com
DEBUG: 2014-07-11 13:04:24 +0200: Found parameters in hostname.example.com
DEBUG: 2014-07-11 13:04:24 +0200: Looking up environment in YAML backend
DEBUG: 2014-07-11 13:04:24 +0200: Looking for data source hostname.example.com
DEBUG: 2014-07-11 13:04:24 +0200: Looking for data source default
DEBUG: 2014-07-11 13:04:24 +0200: Found environment in default
---
parameters:
  role: workstation
environment: production

If many nodes are sharing the same role (or environment) it may be convenient to symlink node names to shared definition files. For example, create a workstation.def and symlink workstation node fqdns to this file, rather than copying the content repeatedly. A long directory listing will therefore show:

# ls -la nodes/
total 12
drwxr-xr-x 2 root root 4096 Jul 11 13:20 .
drwxr-xr-x 6 root root 4096 Jul 11 13:20 ..
lrwxrwxrwx 1 root root   15 Jul 11 13:20 hostname.example.com.yaml -> workstation.def
-rw-r--r-- 1 root root   36 Jul 11 13:20 workstation.def