diff --git a/roles/write-inventory/README.rst b/roles/write-inventory/README.rst
index 7cb941fb5..9e1ba37a9 100644
--- a/roles/write-inventory/README.rst
+++ b/roles/write-inventory/README.rst
@@ -24,3 +24,18 @@ with the inventory for the job.
    A list of facts about the host to exclude.  By default, all
    variables about a host will be included.  To exclude certain
    variables, list them here.
+
+.. zuul:rolevar:: write_inventory_additional_hostvars
+   :type: dict
+
+   Additional hostvars to include.  This can be used to map
+   information from nodepool into the inventory if used as follows:
+
+   .. code-block:: yaml
+
+      write_inventory_additional_hostvars:
+        public_v4: nodepool.public_ipv4
+        public_v6: nodepool.public_ipv6
+
+   This will map hostvars[hostname]['nodepool']['public_ipv4'] to
+   hostvars[hostname]['public_v4'].
diff --git a/roles/write-inventory/library/test_write_inventory.py b/roles/write-inventory/library/test_write_inventory.py
index a1bef81d5..aeeced997 100644
--- a/roles/write-inventory/library/test_write_inventory.py
+++ b/roles/write-inventory/library/test_write_inventory.py
@@ -37,7 +37,6 @@ bionic:
     private_ipv4: 10.210.196.115
     provider: rax-ord
     public_ipv4: 104.130.217.77
-    public_ipv6: 2001:4801:7828:101:be76:4eff:fe10:14eb
     region: ORD
 xenial:
   ansible_connection: ssh
@@ -51,7 +50,6 @@ xenial:
     label: ubuntu-xenial
     private_ipv4: 149.202.170.85
     provider: ovh-gra1
-    public_ipv4: 149.202.170.85
     public_ipv6: 2001:41d0:302:1000::17:a32b
     region: GRA1
 """)
@@ -75,7 +73,7 @@ class TestWriteInventory(testtools.TestCase):
         '''Test passing all variables'''
         dest = self.useFixture(fixtures.TempDir()).path
         dest = os.path.join(dest, 'out.yaml')
-        run(dest, INPUT, GROUPS_INPUT, None, None)
+        run(dest, INPUT, GROUPS_INPUT, None, None, None)
 
         self.assertOutput(dest, {
             'all': {
@@ -108,7 +106,7 @@ class TestWriteInventory(testtools.TestCase):
         '''Test incuding vars'''
         dest = self.useFixture(fixtures.TempDir()).path
         dest = os.path.join(dest, 'out.yaml')
-        run(dest, INPUT, GROUPS_INPUT, ['ansible_host'], None)
+        run(dest, INPUT, GROUPS_INPUT, ['ansible_host'], None, None)
 
         self.assertOutput(dest, {
             'all': {
@@ -135,7 +133,7 @@ class TestWriteInventory(testtools.TestCase):
         '''Test passing all variables'''
         dest = self.useFixture(fixtures.TempDir()).path
         dest = os.path.join(dest, 'out.yaml')
-        run(dest, INPUT, GROUPS_INPUT, None, ['ansible_user'])
+        run(dest, INPUT, GROUPS_INPUT, None, ['ansible_user'], None)
 
         self.assertOutput(dest, {
             'all': {
@@ -161,3 +159,41 @@ class TestWriteInventory(testtools.TestCase):
                 }
             }
         })
+
+    def test_additional(self):
+        '''Test passing additional variables'''
+        dest = self.useFixture(fixtures.TempDir()).path
+        dest = os.path.join(dest, 'out.yaml')
+        run(dest, INPUT, GROUPS_INPUT, None, None,
+            {'public_v4': 'nodepool.public_ipv4',
+             'public_v6': 'nodepool.public_ipv6',
+        })
+
+        self.assertOutput(dest, {
+            'all': {
+                'children': {
+                    'puppet': {
+                        'hosts': {
+                            'bionic': None,
+                            'xenial': None,
+                        },
+                    },
+                },
+                'hosts': {
+                    'bionic': {
+                        "ansible_connection": "ssh",
+                        "ansible_user": "zuul",
+                        "ansible_host": "104.130.217.77",
+                        "ansible_port": 22,
+                        "public_v4": "104.130.217.77",
+                    },
+                    'xenial': {
+                        "ansible_connection": "ssh",
+                        "ansible_user": "zuul",
+                        "ansible_host": "149.202.170.85",
+                        "ansible_port": 22,
+                        "public_v6": "2001:41d0:302:1000::17:a32b",
+                    }
+                }
+            }
+        })
diff --git a/roles/write-inventory/library/write_inventory.py b/roles/write-inventory/library/write_inventory.py
index 1fdb6a32f..697abf30f 100755
--- a/roles/write-inventory/library/write_inventory.py
+++ b/roles/write-inventory/library/write_inventory.py
@@ -28,7 +28,7 @@ VARS = [
 ]
 
 
-def run(dest, hostvars, groups, include, exclude):
+def run(dest, hostvars, groups, include, exclude, additional):
     children = {}
     for group, hostnames in groups.items():
         if group == 'all' or group == 'ungrouped':
@@ -58,6 +58,15 @@ def run(dest, hostvars, groups, include, exclude):
                     continue
             d[v] = hvars[v]
         out_all[host] = d
+        if additional:
+            for new_var_name, old_var_name in additional.items():
+                old_var = hvars
+                for part in old_var_name.split('.'):
+                    old_var = old_var.get(part)
+                    if old_var is None:
+                        break
+                else:
+                    d[new_var_name] = old_var
 
     with open(dest, 'w') as f:
         f.write(json.dumps(out))
@@ -71,6 +80,7 @@ def ansible_main():
             groups=dict(required=True, type='raw'),
             include_hostvars=dict(type='list'),
             exclude_hostvars=dict(type='list'),
+            additional_hostvars=dict(type='raw'),
         )
     )
 
@@ -81,8 +91,9 @@ def ansible_main():
     groups = p.get('groups')
     include = p.get('include_hostvars')
     exclude = p.get('exclude_hostvars')
+    additional = p.get('additional_hostvars', {})
 
-    run(dest, hostvars, groups, include, exclude)
+    run(dest, hostvars, groups, include, exclude, additional)
 
     module.exit_json(changed=True)
 
diff --git a/roles/write-inventory/tasks/main.yaml b/roles/write-inventory/tasks/main.yaml
index 38b23834e..26a82facb 100644
--- a/roles/write-inventory/tasks/main.yaml
+++ b/roles/write-inventory/tasks/main.yaml
@@ -5,3 +5,4 @@
     groups: "{{ groups }}"
     include_hostvars: "{{ write_inventory_include_hostvars | default(omit) }}"
     exclude_hostvars: "{{ write_inventory_exclude_hostvars | default(omit) }}"
+    additional_hostvars: "{{ write_inventory_additional_hostvars | default(omit) }}"