feat: restart networking on network changes

- restart network on RedHat
- restart networking on debian

modules/networking/manifests/init.pp

@@ -9,19 +9,37 @@ class networking (
   include network
   include networking::params
 
+  # manage interfaces
   $interfaces.each | $interface, $data | {
     $merged_data = merge($interface_defaults, $data)
-    network_config {$interface:
-      * => $merged_data,
+    network_config { $interface:
+      *      => $merged_data,
+      notify => Exec['networking_reload_network'],
     }
   }
+
+  # manage routes
   $routes.each | $route, $data | {
     $merged_data = merge($route_defaults, $data)
-    network_route {$route:
-      * => $merged_data,
+    network_route { $route:
+      *      => $merged_data,
+      notify => Exec['networking_reload_network'],
     }
   }
 
+  # determine which networking service to restart
+  $restart_command = $facts['os']['family'] ? {
+    'RedHat' => '/usr/bin/systemctl restart network',
+    'Debian' => '/usr/bin/systemctl restart networking',
+    default  => fail('Unsupported OS in networking-restart-command'),
+  }
+
+  # restart network/networking only if $restart_networking boolean is true
+  exec { 'networking_reload_network':
+    command     => $restart_command,
+    refreshonly => true,
+  }
+
   # prevent DNS from being overwritten by networkmanager
   if $networking::params::nwmgr_dns_none {
     file {'/etc/NetworkManager/conf.d/dns_none.conf':