Puppet users - Aug 2013 - Accessing hiera_hash values in puppet templates

I am setting up a nagios hosts definition file using ec2 data with puppet 
3.2.

The hiera JSON file generated looks like this:
 {
    "instances": {
        "prod-api-01": {
            "private_ip": "10.1.1.1",
            "public_ip": "23.1.1.1",
        },
        "prod-api-02": {
            "private_ip": "10.2.2.2",
            "public_ip": "23.2.2.2",
        },
        "prod-api-03": {
            "private_ip": "10.3.3.3",
            "public_ip": "23.3.3.3",
        }
    }
}


My manifest has the following declarations:

$instances = hiera_hash(''instances'')
$instance_names = keys($instances)


In my hosts.cfg.erb template, I attempted the following, but neither works 
(entries for alias and address are blank).

<%- @instances.each_pair do |instance_name, attributes| -%>
define host {
    host_name    <%= @instance_name %>
    use          host-platform-prod-group
    alias        <%= attributes[''public_ip''] %>
    address      <%= attributes[''private_ip''] %>
}
<%- end -%>

AND

<%- @instance_names.each do | instance_name | -%>
define host {
    host_name    <%= @instance_name %>
    alias        <%=
@instances[@instance_name][''public_ip''] %>
    address      <%=
@instances[@instance_name][''private_ip''] %>
}
<%- end -%>


I know I can access @instances and @instance_names within the template, but 
the template does not appear to  find values for the loop variable 
@instance_name. Why is this?

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On 2013-09-08 17:13, Rafi wrote:
> <%- @instance_names.each do | instance_name | -%>
> define host {
>      host_name    <%= @instance_name %>
>      alias        <%=
@instances[@instance_name][''public_ip''] %>
>      address      <%=
@instances[@instance_name][''private_ip''] %>
> }
> <%- end -%>
>
>
> I know I can access @instances and @instance_names within the template,
> but the template does not appear to  find values for the loop variable
> @instance_name. Why is this?
>
Because it should be accessed without the @ since it is not a variable 
from Puppet.

Try:

   alias        <%= @instances[instance_name][''public_ip'']
%>

Regards
- henrik


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