Add a name resolution facility for hostnames

Make sure that hosts can always resolve each other's names.
For the moment, this simply uses exported /etc/hosts entries.
Less naive implementations could just export the address/hostname
tuples and feed them into a DNS server configuration.

manifests/init.pp

@@ -18,6 +18,7 @@
 class kickstack ( 
   $fact_prefix   = $kickstack::params::fact_prefix,
   $fact_filename = $kickstack::params::fact_filename,
+  $name_resolution = $kickstack::params::name_resolution,
   $verbose       = $kickstack::params::verbose,
   $debug         = $kickstack::params::debug,
   $database      = $kickstack::params::database,
@@ -57,4 +58,5 @@ class kickstack (
 
   include exportfact
   include openstack::repo
+  include kickstack::nameresolution
 } 

manifests/nameresolution.pp

@@ -0,0 +1,16 @@
+class kickstack::nameresolution inherits kickstack {
+
+  case $::kickstack::name_resolution {
+    'hosts': {
+
+      @@host { "$hostname":
+        ip => $ipaddress,
+        comment => "Managed by Puppet",
+        tag => "hostname"
+      }
+
+      Host <<| tag == "hostname" |>> {  }
+    }
+  }
+}
+

manifests/params.pp

@@ -12,6 +12,11 @@ class kickstack::params {
   # * override by setting "kickstack_fact_category"
   $fact_category = pick(getvar("::${variable_prefix}fact_category"), "kickstack")
 
+  # The strategy to use so machines can make their hostnames known to
+  # each other.
+  # * default "hosts" -- manage /etc/hosts
+  $name_resolution = pick(getvar("::${variable_prefix}name_resolution"),"hosts")
+
   # Enables verbose logging globally 
   $verbose = str2bool(pick(getvar("::${variable_prefix}verbose"), 'false'))