Puppet string interpolation with function call and a variable as parameter

Hiera is included in Puppet 3.0 - in 2.7, you'll need to install it separately on your masters.

Since it sounds like you'll want the mapping to be global, you'll want to put it in a Hiera file that applies to all systems. So in your hiera.yaml, you'll want something like..

:backends:
  - yaml

:hierarchy:
  - common

:yaml:
   :datadir: /etc/puppet/hieradata

Then in /etc/puppet/hieradata/common.yaml, set up your port mappings:

port_app_1: "27960"
port_app_2: "27961"

With that in place, you can look it up in your vhost config.

$vhost_port = hiera("port_${name}")

It looks like you're intending to pass in a array of routes to net::addr in a routes name, but you've defined it as taking the 4 keys of each route rather then the route array. Try the following and see if it works any better.

node test{
    net::addr { 'routing':
        routes => {
            route1 => {
                address => '172.29.54.70',
                netmask => '255.255.255.0',
                gateway => '172.29.54.65',
                dev     => 'eth0',
            },
            route2 => {
                address => '192.168.1.3',
                netmask => '255.255.255.0',
                gateway => '192.168.1.1',
                dev     => 'eth3',
            },
        }
    }
}

and

define net::addr (
  $routes={},
) {
    file { "route-${name}":
        ensure  => 'present',
        mode    => '0644',
        owner   => 'root',
        group   => 'root',
        path    => "/etc/sysconfig/network-scripts/route-${name}",
        content => template('network/addr.erb'),
    }
}

Edit: Fixed typo, padding to get by edit character limit