Finding out facts
It's very common for Puppet manifests to need to know something about the system they're running on; for example, its hostname, IP address, or operating system version. Puppet's built-in mechanism for getting system information is called Facter, and each piece of information provided by Facter is known as a fact.
Using the facts hash
You can access Facter facts in your manifest using the facts hash. This is a Puppet variable called $facts which is available everywhere in the manifest, and to get a particular fact, you supply the name of the fact you want as the key (facts_hash.pp):
notice($facts['kernel'])
On the Vagrant box, or any Linux system, this will return the value Linux.
In older versions of Puppet, each fact was a distinct ...
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