Supporting setting domain on nodes

- During the genesis or join operation when /etc/hosts and
  /etc/resolv.conf are controlled by Promeande, we need to
  support including a domain name. This can be configured
  by YAML definition or by the join-script API. To support
  backward compatability use a default of 'local' when no
  domain is specified.

Testing: `./tools/gate.sh resiliency` has passed locally

Change-Id: Ia0d300912d3ec25eb7f1cb9c580eaa40b5b4addb

promenade/config.py

@@ -75,23 +75,29 @@ class Configuration:
                              jinja2.StrictUndefined(
                                  'No match found for path %s' % path))
 
-    def get_first(self, *paths):
+    def get_first(self, *paths, default=None):
         result = self._get_first(*paths)
         if result:
             return result
         else:
-            return jinja2.StrictUndefined(
-                'Nothing found matching paths: %s' % ','.join(paths))
+            if default:
+                return default
+            else:
+                return jinja2.StrictUndefined(
+                    'Nothing found matching paths: %s' % ','.join(paths))
 
-    def get(self, *, kind=None, name=None, schema=None):
+    def get(self, *, kind=None, name=None, schema=None, default=None):
         result = _get(self.documents, kind=kind, schema=schema, name=name)
 
         if result:
             return result['data']
         else:
-            return jinja2.StrictUndefined(
-                'No document found matching kind=%s schema=%s name=%s' %
-                (kind, schema, name))
+            if default:
+                return default
+            else:
+                return jinja2.StrictUndefined(
+                    'No document found matching kind=%s schema=%s name=%s' %
+                    (kind, schema, name))
 
     def iterate(self, *, kind=None, schema=None, labels=None, name=None):
         if kind is not None:

promenade/control/join_scripts.py

@@ -39,6 +39,8 @@ class JoinScriptsResource(BaseResource):
         design_ref = req.get_param('design_ref', required=True)
         ip = req.get_param('ip', required=True)
         hostname = req.get_param('hostname', required=True)
+        # NOTE(sh8121att): Set a default here for backward compatability
+        dns_domain = req.get_param('domain', default='local')
 
         dynamic_labels = _get_param_list(req, 'labels.dynamic')
         static_labels = _get_param_list(req, 'labels.static')
@@ -70,6 +72,7 @@ class JoinScriptsResource(BaseResource):
             },
             'data': {
                 'hostname': hostname,
+                'domain': dns_domain,
                 'ip': ip,
                 'join_ip': join_ip,
                 'labels': {

promenade/schemas/Genesis.yaml

@@ -81,6 +81,9 @@ data:
     hostname:
       $ref: '#/definitions/hostname'
 
+    domain:
+      type: string
+
     ip:
       $ref: '#/definitions/ip_address'
 

promenade/schemas/KubernetesNode.yaml

@@ -26,6 +26,9 @@ data:
     ip:
       $ref: '#/definitions/ip_address'
 
+    domain:
+      type: string
+
     join_ip:
       $ref: '#/definitions/ip_address'
 

promenade/templates/roles/common/etc/hosts

@@ -1,6 +1,6 @@
 # This file is controlled by Promenade.  Do not modify.
 #
-127.0.0.1       {{ config.get_first('Genesis:hostname', 'KubernetesNode:hostname') }}
+127.0.0.1       {{ config.get_first('Genesis:hostname', 'KubernetesNode:hostname') }}.{{ config.get_first('Genesis:domain', 'KubernetesNode:domain', default='local') }} {{ config.get_first('Genesis:hostname', 'KubernetesNode:hostname') }}
 127.0.0.1       localhost
 {%- for entry in config.get_path('KubernetesNetwork:hosts_entries', []) %}
 {{ entry['ip'] }}    {{ entry['names'] | join(' ') }}