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Onyx Point Inc.
7050 Hi Tech Dr, Suit3 102
Hanover, MD 21076
07 11 2017 — 9am
by Dylan Cochran
In this blog post, I’m going to talk about a new feature added in Hiera v5, which is yaml file globbing.
Hiera is the data access layer for Puppet, and it is organized into hierarchies. When Puppet calls lookup(), it looks through each layer in the hierarchy, in order, and attempts to retrieve the value for a key from the layer. When it can’t find a key in the current layer, it continues on to the next one down, one at a time, until it finds a match.
Here is an example of a common hierarchy setup. We have a layer for per-node data, we have a layer for hostgroups, a layer for osfamily (eg ‘Windows’ vs ‘RedHat’), and a common layer.
Each file is explicitly specified in the hierarchy. But this leads to a problem with organization. What if we want to keep all of the GitLab settings in common.yaml together? or the Nginx settings? We could separate them in the yaml files with headers and whitespace. We could also try to use separate files, but because each file in each layer is specified in the file, we have to explicitly add a new layer for each file.
This is where globbing comes in.
If we replace paths with globs, we can use * and ? as wildcards to the filename. Puppet will automatically expand that into a real file when lookup runs. Now we can have a set of Hiera data files like this:
And all of our GitLab settings, Nginx settings, and NTP settings are neatly organized into their own files. We can do this on any hierarchy layer we want, so we can even change the per-node data to match this scheme. In this way data can be stored in nodes/mom.test/gitlab.yaml or nodes/mom.test/nginx.yaml instead of all sharing nodes/mom.test.yaml← View all posts