Puppet users - Dec 2010 - Create many similar files from an array in a module manifest

Hi,

I want to create a single configuration file with one or two
differences, many times. Therefore, i''d like to do the following in
pseudo-code:

files = [(a,b), (c,d), (e,f)...]
foreach a,b in files:
  create_file(a,b)

Which can then use what I think is a valid definition:
define create_file($port, $fullserver) {
    file { "test.erb":
        content => template(''test.erb''),
    }
}

Sadly, it seems that I can not work out either
a) How to do the "foreach" in the module manifest, to call the defined
function many times with different paramaters
b) Where to put the create_file function for puppet to actually
recognise it. I have tried <moduledir>/plugins/puppet/parser/functions/
test.rb and <moduledir>/lib/puppet/parser/functions/test.rb, but get
error "Could not retrieve catalog: Unknown function create_file" on
the client.

Any suggestions greatly appreciated!

Cheers,

Alex

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I use the following in a class:
/etc/puppet/manifests/classes/impuls_test.pp:
$line = ''test''
$tomcatInstances = [ "tc6_a", "tc6_b", "tc6_c",
"tc6_d", "tc6_e",
"tc6_f", "tc6_g", "tc6_h", "tc6_i",
"tc6_j" ]
  tc6conf { $tomcatInstances: }
}

and then the following definition:
/etc/puppet/manifests/classes/definitions.pp:
# Tomcat server.xml.erb und tomcat6.conf.erb shortcut
define tc6conf(owner = root, group = root, mode = 644,
                  backup = false, recurse = false, ensure = file) {

    file { "/tmp/$name-server.xml":
            mode => $mode,
            owner => $owner,
            group => $group,
            backup => $backup,
            recurse => $recurse,
            ensure => $ensure,
            content => template("$line/$name/server.xml.erb")
    }

    file { "/tmp/$name-tomcat6.conf":
            mode => $mode,
            owner => $owner,
            group => $group,
            backup => $backup,
            recurse => $recurse,
            ensure => $ensure,
            content => template("$line/$name/tomcat6.conf.erb")
    }
}

And matching template files /var/lib/puppet/templates/test/tc6_a/
server.xml.erb or in /etc/puppet/templates/
What it does is it deploys the template files server.xml.erb and
tomcat6.conf for each tomcat to /tmp
So what you get is /tmp/tc6_a-server.xml and /tmp/tc6_a-tomcat6.conf
and so on.

What I also would like to know is how to pass additional parameters to
my defined function, like your $port or $fullserver.

I hope that this helps you in any way.

On Dec 13, 3:01 am, Alex <a...@davz.net> wrote:
> Hi,
>
> I want to create a single configuration file with one or two
> differences, many times. Therefore, i''d like to do the following
in
> pseudo-code:
>
> files = [(a,b), (c,d), (e,f)...]
> foreach a,b in files:
>   create_file(a,b)
>
> Which can then use what I think is a valid definition:
> define create_file($port, $fullserver) {
>     file { "test.erb":
>         content => template(''test.erb''),
>     }
>
> }
>
> Sadly, it seems that I can not work out either
> a) How to do the "foreach" in the module manifest, to call the
defined
> function many times with different paramaters
> b) Where to put the create_file function for puppet to actually
> recognise it. I have tried
<moduledir>/plugins/puppet/parser/functions/
> test.rb and <moduledir>/lib/puppet/parser/functions/test.rb, but get
> error "Could not retrieve catalog: Unknown function create_file"
on
> the client.
>
> Any suggestions greatly appreciated!
>
> Cheers,
>
> Alex
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On 12/13/2010 03:01 AM, Alex wrote:
> Hi,
> 
> I want to create a single configuration file with one or two
> differences, many times. Therefore, i''d like to do the following
in
> pseudo-code:
> 
> files = [(a,b), (c,d), (e,f)...]
> foreach a,b in files:
>   create_file(a,b)
> 
> Which can then use what I think is a valid definition:
> define create_file($port, $fullserver) {
>     file { "test.erb":
>         content => template(''test.erb''),
>     }
> }
Define doesn''t define a function, it defines a resource type.

You need no array, just use your define as:

create_file {
  "/etc/foo1.conf":
    port => $a,
    fullserver => $b;
  "/etc/foo2.conf":
    port => $c,
    fullserver => $d;
  ...
}

You will want to change the define as follows:
define create_file($port, $fullserver) {
    file { "$name":
        content => template(''test.erb''),
    }
}

file { "$name": ... } instead of a static name.
Otherwise puppet *will* complain about multiple definition of
File["test.erb"].

HTH,
Felix

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