modifying file(s) on the fly

[Sans]

Dear all,

I'm trying to figure out how to do this - first copy a "common" file to every node and then modify the file according to the node type. I've tried this:

if $node_type == 'wn' {
        $port = '8649'
        $desc = 'Worker Nodes'
}

exec {   
    'n_desc':   
    command     => "sed -ic '/cluster {/,/}/s/name = \"[^\"]*\"/name = \"\'\"$desc\"\'\"/' '$fname'",
    subscribe   => File["$fname"],
    refreshonly => false;

    'n_port':
    command     => "sed -ic '/port\ =\ /{s:[0-9]*$:$port:g}' '$fname'",
    subscribe   => File["$fname"],
    refreshonly => false;
}

file {
    'gmond.conf':
     name    => "$fname",
     source  => 'puppet:///modules/ganglia/gmond.conf',
     require => Exec['n_desc','n_port'],
     notify  => Service['gmond'];
}

The problem is the Exec['n_desc','n_port'] is being executed but then it changing back to the original one as supplied by:  source  => 'puppet:///modules/ganglia/gmond.conf', which is definitely not what I want. How can I make sure it copy the file first and then make the changes? Or, simply how do I do that? Cheers!!

[Denmat]

Hi,

I think templates would be easier to manage in this setup. 

http://docs.puppetlabs.com/learning/templates.html

It will give good flexibility. It the way I have managed my ganglia setup.

Cheers,

Den

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[Sans]

Yes, I did think about using template one point.
So, do you generate the entire file using "template"? For us, it's just a few lines to change in the default gmod.conf file.

cheers,
San

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[Denmat]

Yep. Templates are just normal files that go through the ERB parser so you can make adjustments on the fly.  And it appears you are trying to push out the file anyway (using the source => param) so it seems like a good fit to me.

Cheers

Den

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[Jo Rhett]

Use a template instead.  Then you can install the file already modified for the host.

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Jo Rhett

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[Sans]

Thanks Den, Jo! I did it using template() now.

Cheers,
San

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