dns: exclude k8s/LB ranges from dns-updater; track latest

Sets DNS_UPDATER_DENY_RANGES so the daemon never publishes records whose
address is in the k8s pod CIDR (10.42.0.0/16), service CIDR (10.43.0.0/16), the
LB VIP pool (198.18.200.0/24) or 198.18.199.0/24 — keeping kube-lb0/flannel/etc.
and their reverse PTRs out of the authoritative zones and stopping NOTAUTH
updates for zones we do not host. Exposes deny/allow ranges+domains as class
params. Also bumps package_ensure to 'latest' so hosts pick up the filter
release (rpm-internal metadata_expire is 1h).

site/profiles/manifests/dns/updater.pp

@@ -23,12 +23,22 @@ class profiles::dns::updater (
   Stdlib::AbsolutePath        $state_dir       = '/var/lib/dns-updater',
   Stdlib::AbsolutePath        $config_dir      = '/etc/dns-updater',
   Stdlib::AbsolutePath        $master_basedir  = lookup('profiles::dns::master::basedir'),
-  # dns-updater daemon (replaces the dns-update shell script).
-  String                      $package_ensure   = 'installed',
+  # dns-updater daemon (replaces the dns-update shell script). 'latest' so hosts
+  # pick up new releases (e.g. the record filter); rpm-internal metadata_expire
+  # is 1h so this does not thrash.
+  String                      $package_ensure   = 'latest',
   Stdlib::AbsolutePath        $api_socket       = '/run/dns-updater/api.sock',
   String                      $resync           = '10m',
   Enum['debug', 'info', 'warn', 'error'] $log_level = 'info',
   Boolean                     $watch_interfaces = true,
+  # Never publish records whose address falls in these ranges: the k8s pod CIDR
+  # (10.42.0.0/16) and service CIDR (10.43.0.0/16), the LB VIP pool
+  # (198.18.200.0/24) and 198.18.199.0/24. Keeps kube-lb0/flannel/etc. out of
+  # the authoritative zones and stops NOTAUTH updates for zones we do not host.
+  Array[String]               $deny_ranges     = ['198.18.199.0/24', '198.18.200.0/24', '10.42.0.0/16', '10.43.0.0/16'],
+  Array[String]               $allow_ranges    = [],
+  Array[String]               $deny_domains    = [],
+  Array[String]               $allow_domains   = [],
 ) {
 
   $state_file  = "${state_dir}/applied"
@@ -103,6 +113,11 @@ class profiles::dns::updater (
         ensure => $package_ensure,
       }
 
+      $deny_ranges_str   = join($deny_ranges, ',')
+      $allow_ranges_str  = join($allow_ranges, ',')
+      $deny_domains_str  = join($deny_domains, ',')
+      $allow_domains_str = join($allow_domains, ',')
+
       $env_content = @("ENV")
         # Managed by puppet (profiles::dns::updater).
         DNS_UPDATER_SERVER=${server}
@@ -113,6 +128,10 @@ class profiles::dns::updater (
         DNS_UPDATER_RESYNC=${resync}
         DNS_UPDATER_WATCH_INTERFACES=${watch_interfaces}
         DNS_UPDATER_LOG_LEVEL=${log_level}
+        DNS_UPDATER_DENY_RANGES=${deny_ranges_str}
+        DNS_UPDATER_ALLOW_RANGES=${allow_ranges_str}
+        DNS_UPDATER_DENY_DOMAINS=${deny_domains_str}
+        DNS_UPDATER_ALLOW_DOMAINS=${allow_domains_str}
         | ENV
 
       file { "${config_dir}/env":