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Handle duplicate declaration between modules

asked 2014-07-15 17:17:26 -0600

n0thing gravatar image


I've just started using Puppet, so this might be an obvious question, but I'm having some trouble using multiple modules in a manifest. Basically, I'm writing a manifest that uses the puppetlabs-postgresql module to install postgres, but before that I want to install some packages using apt which requires executing

sudo apt-get update

It makes sense writing this in Puppet though instead of doing an exec declaration:

class { 'apt':
    stage => init,
    always_apt_update => true

However, if I use this, I get the following error message:

Error: Duplicate declaration: Class[Apt] is already declared; cannot redeclare at /path/to/provision.pp:216 on node node1

Presumably because the postgresql module uses the apt class as well. How do I handle such situations? As an example, I got to be able to use two classes that both use the apt class for different purposes, right -- I shouldn't have to worry about the implementation of the module when using them?

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answered 2014-07-15 19:06:16 -0600

spuder gravatar image

Two common ways to prevent this

Use global scope on the class

class { '::apt': }


Use the include syntax

include apt

Just guessing, but you likely don't need the two parameters that you have added, a simple include apt should be sufficient.

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Great, thank you! Using the global scope solved my issue -- however, I ran into another issue. I thought it warranted its own thread:

n0thing gravatar imagen0thing ( 2014-07-16 13:49:13 -0600 )edit

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Asked: 2014-07-15 17:16:50 -0600

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Last updated: Jul 15 '14