Creating custom facts
While Facter's built-in facts are useful, it's actually quite easy to add your own facts. For example, if you have machines in different data centers or hosting providers, you could add a custom fact for this so that Puppet can determine whether any local settings need to be applied (for example, local DNS servers or network routes).
How to do it...
Here's an example of a simple custom fact:
Create the directory
modules/facts/lib/facter
and then create the filemodules/facts/lib/facter/hello.rb
with the following contents:Facter.add(:hello) do setcode do "Hello, world" end end
Modify your
site.pp
file as follows:node 'cookbook' { notify { $::hello: } }
Run Puppet:
[root@cookbook ~]# puppet agent -t Notice: /File[/var/lib/puppet/lib/facter/hello.rb]/ensure: defined content as '{md5}f66d5e290459388c5ffb3694dd22388b' Info: Loading facts Info: Caching catalog for cookbook.example.com Info: Applying configuration version '1416205745' Notice: Hello, world Notice: /Stage...