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How retrieve a fact and store this value in a variable with Puppet?

asked 2016-08-03 09:17:12 -0500

Edely gravatar image

I have a script where I retrieve the IP from a machine and then perform some logical operations to decide what value give to a variable. Then I use this value to make some decisions about the environment the machine is working.

I am trying to translate this to Puppet, but I am not shure how to proceed. I know I can retrieve the IP using facts, but should I do this in an manifest or a template. Also where should I perform the logical operations. Have in mind I'm going to do string manipulation.

To summerize, these are the steps I have to take.

1) Get the IP from the machine.

2) Perform logical operations.

3) Pass a variable with the result to a manifest.

Thanks in advance.

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answered 2016-08-03 16:48:55 -0500

DarylW gravatar image

It depends on what you are trying to do, your usecase sounds like the following..

Your IP addresses belong to specific subnets.. Given that it matches a particular subnet, you know it is in the X region as opposed to the Y region Configure part of your system that has region specific information.

In a case similar to that, the way that most people procede is to not do the logic directly in puppet. You would create a custom fact that can boil down the single piece of information for you (region/datacenter/ test/prod/dev/qa staging env, etc..)

I would recommend looking though to learn about writing custom facts. You would use that information (getting the current IP address by referencing the ipaddress fact, etc..), figure out the bits you need (case statement/regex matchers or something), and then return a value for the fact that you can use to key other configuration off of later.

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Thanks. This is exactly what I am trying to do. I going take a look in the approach you recommended.

Edely gravatar imageEdely ( 2016-08-04 05:20:01 -0500 )edit

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Asked: 2016-08-03 09:17:12 -0500

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Last updated: Aug 03 '16