You are right is not a node fact but an "env" datum, so I developed a
function that get me the IP address of a Hostname and assigned to a
variable of the node.
Thanks
Luca
Il giorno mercoledì 28 agosto 2013 15:41:10 UTC+2, jcbollinger ha scritto:
>
>
>
> On Wednesday, August 28, 2013 3:58:00 AM UTC-5, Luca Gioppo wrote:
>>
>> I need to create a custom fact based on a parametric information (I need
>> to get the IP of another machine knowing the hostname, the machine name
>> could be different for different nodes so I need it parameteric and I
>> recover the machine hostname from a hiera, but for the purpose of the
>> question it could also be a data in the module definition).
>>
>> I'm installing a cluster and need to get the master IP and if I can set
>> the hostname as a fixed known information the IP will be variable since I'm
>> installing it in a cloud environment
>>
>> The custom facter code is:
>>
>> # master_ip.rb:
>> #
>>
>> require 'facter'
>>
>> if FileTest.exists?("/usr/bin/dig")
>> cmd = sprintf('/usr/bin/dig +short HERE_GOES_THE PARAMETRIC_HOSTNAME')
>> result = `#{cmd}`
>> Facter.add("master_ip") do
>> setcode { result }
>> end
>> end
>>
>>
>> Any Idea on how to refer to a data present in the module like
>> $master_hostname or a hiera hash like $master_info['hostname']
>>
>>
>
> This is altogether the wrong approach. The datum you wish to evaluate is
> not a property of the node, but rather a property of its environment,
> therefore it is not a node fact.
>
> If you want the master IP to be a top-scope variable then it is possible
> to make it so without making it a node fact, though I think that would be a
> poor design choice. Instead, you should make it a class variable of some
> suitable class. Wherever you hang it, you can assign the value based on
> your looked-up hostname, using a custom function or perhaps the built-in
> generate() function.
>
>
> John
>
>
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