using a template, how do you create multiple files whose names come from an array?

[senorsmile]

For example, I have an array like this:

clusters => [
  'cluster1',
  'cluster2',
  'cluster3',
  'cluster4',
]

I then have a cluster.init.erb that looks soemthing like this:

start on runlevel [2345]
stop on runlevel [!2345]

expect fork
respawn

<% @clusters.each do | cluster | -%>
env PIDFILE="/var/run/${cluster}.pid"

exec /usr/sbin/program_name --pid-file=$PIDFILE
<% end -%>

That is all theoretical at this point since it doesn't work.
What I need it to do is dynamically generate a certain number of files, equal to the number of files in the array "clusters", whose names I will not know beforehand, and changes from host to host. 

[Cristian Falcas]

Feed the array to a define where you call the template.

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[Yanis Guenane]

You could create a define that would be an intermediate layer. Code
would look like the following :

Manifest
--------

$clusters = ['cluster1', 'cluster2', 'clustern']

myclass::mydefine {$clusters : }


Define
------

class myclass::mydefine {

$path = "/tmp/${name}"

file { $path :
ensure => present,
content => template('myclass/foo.erb'),
}

}

Template
--------

Find my value <%= @name %>


Hope this helps,

--
Yanis Guenane

[senorsmile]

So, I have this partially working.  

in /etc/puppet/manifests/nodes.pp I have (all entries truncated and scrubbed): 

node node_example {
  class { 'ganglia::install::gmetad':

    clusters        => [
      'cluster1',
      'cluster2',
      'cluster3',
      'cluster4',
    ]
}

and under /etc/puppet/modules/ganglia/install/gmetad.pp

class ganglia::install::gmetad () {


  define generate_gmond_init(
    $init_template = 'ganglia/gmond_init.erb',
    $conf_template = 'ganglia/gmond_master_conf.erb',
  ) {
    file { "/etc/init/gmond_${name}.conf":
      content => template("$init_template"),
    }
    file { "/etc/ganglia/gmond_${name}.conf":
      content => template("$conf_template"),
    }
  }


  generate_gmond_init{ $clusters: }



}

Now, in each template I can call 

<%= name %>

in order to call the name var as it passes through each array.  

I need to make this a little more complicated by adding more than a single bit of information; i.e. I need to create a hash of clusters, each with their own data, something like this: 

    clusters        => {
      'cluster1' => { port => 8655 },
      'cluster2' => { port => 8656 },
      'cluster3' => { port => 8657 },
      'cluster4' => { port => 8658 },
    }

so that I can access more than just the cluster name in each template.  

[senorsmile]

I have solved this using create_resources 

http://docs.puppetlabs.com/references/latest/function.html#createresources

which converts the hash into arrays that a define can digest.  

[Cristian Falcas]

I think you can solve like this also:

<% @clusters.each do |key,value| %>
cluster name is <%=key %> and cluster port is <%= value %>
<% end -%>

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[senorsmile]

Ah, I didn't know you could do that.  Reading through the documentation can lead to one's mind melting.  

This may be preferable as create_resources messes up my resource ordering.  

Thanks!

[Cristian Falcas]

Just be careful how you call the variables: puppet var is <%= @name%>, local var will be <%= name %>

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