diff --git a/defaults/main.yml b/defaults/main.yml
index fcb2fdf..639b554 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -37,6 +37,11 @@ repo_build_release_tag: "untagged"
 #                   in Newton.
 # repo_build_pip_extra_index: "https://pypi.python.org/simple"
 
+# Toggle the use of Ubuntu Cloud Archive
+repo_build_uca_enable: True
+# Ubuntu Cloud Archive mirror URL
+uca_apt_repo_url: "http://ubuntu-cloud.archive.canonical.com/ubuntu"
+
 repo_build_timeout: 120
 repo_build_concurrency: "{{ ansible_processor_count if ansible_processor_count > 0 else 5}}"
 repo_build_venv_build_dir: "/tmp/openstack-venv-builder"
diff --git a/releasenotes/notes/repo-build-use-uca-by-default-bde8ded7d72cd42c.yaml b/releasenotes/notes/repo-build-use-uca-by-default-bde8ded7d72cd42c.yaml
new file mode 100644
index 0000000..58b69b3
--- /dev/null
+++ b/releasenotes/notes/repo-build-use-uca-by-default-bde8ded7d72cd42c.yaml
@@ -0,0 +1,4 @@
+---
+upgrade:
+  - The ``repo_build`` role now makes use of Ubuntu Cloud Archive by default.
+    This can be disabled by setting ``repo_build_uca_enable`` to ``False``.
diff --git a/tasks/install-apt.yml b/tasks/install-apt.yml
index 6c2679e..a019151 100644
--- a/tasks/install-apt.yml
+++ b/tasks/install-apt.yml
@@ -13,6 +13,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Add Ubuntu Cloud Archive keyring
+  apt:
+    pkg: ubuntu-cloud-keyring
+    state: latest
+  register: add_uca_keys
+  when: repo_build_uca_enable | bool
+
+- name: Add Ubuntu Cloud Archive Repository
+  apt_repository:
+    repo: "{{ uca_repo }}"
+    state: present
+  register: add_uca_repo
+  when: repo_build_uca_enable | bool
+
 - name: Drop lxc-net override file
   template:
     src: manual-init.override.j2
@@ -36,7 +50,8 @@
 - name: Update apt if needed
   apt:
     update_cache: yes
-  when: "ansible_date_time.epoch|float - apt_cache_stat.stat.mtime > {{cache_timeout}}"
+  when: ("ansible_date_time.epoch|float - apt_cache_stat.stat.mtime > {{cache_timeout}}" or
+        add_uca_keys | changed or add_uca_repo | changed)
   tags:
     - repo-build-apt-packages
 
diff --git a/tests/test-repo-build.yml b/tests/test-repo-build.yml
index ee95736..7d33903 100644
--- a/tests/test-repo-build.yml
+++ b/tests/test-repo-build.yml
@@ -16,6 +16,26 @@
 - name: Build repo
   hosts: repo_all
   user: root
+  pre_tasks:
+    - name: Check if this is an OpenStack-CI nodepool instance
+      stat:
+        path: /etc/nodepool/provider
+      register: nodepool
+      delegate_to: localhost
+    - name: Determine the existing Ubuntu repo URL (only on OpenStack-CI)
+      shell: 'awk "/^deb .*ubuntu\/? {{ ansible_distribution_release }} main/ {print \$2; exit}" /etc/apt/sources.list'
+      register: ubuntu_repo_url
+      changed_when: false
+      when:
+        - ansible_pkg_mgr == 'apt'
+        - nodepool.stat.exists | bool
+      delegate_to: localhost
+    - name: Set Ubuntu Cloud Archive repo URL based on discovered information
+      set_fact:
+        uca_apt_repo_url: "{{ ubuntu_repo_url.stdout | netorigin }}/ubuntu-cloud-archive"
+      when:
+        - ansible_pkg_mgr == 'apt'
+        - nodepool.stat.exists | bool
   roles:
     - "repo_server"
     - "{{ rolename | basename }}"
diff --git a/vars/ubuntu-14.04.yml b/vars/ubuntu-14.04.yml
new file mode 100644
index 0000000..a06b444
--- /dev/null
+++ b/vars/ubuntu-14.04.yml
@@ -0,0 +1,45 @@
+---
+# Copyright 2016, Rackspace US, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+## APT Cache options
+cache_timeout: 600
+
+# Ubuntu Cloud Archive variables
+# There are no UCA packages for Trusty beyond Mitaka, so the selected
+# release here has to remain at Mitaka.
+uca_openstack_release: mitaka
+uca_repo_dist: "{{ ansible_lsb.codename }}-updates/{{ uca_openstack_release }}"
+uca_repo: "deb {{ uca_apt_repo_url }} {{ uca_repo_dist }} main"
+
+repo_build_packages:
+  - build-essential
+  - cmake
+  - git
+  - liberasurecode-dev      # required to build pyeclib
+  - libffi-dev              # required to build xattr
+  - libjpeg-dev             # required to build pillow
+  - libkrb5-dev             # required to build pykerberos
+  - libldap2-dev            # required to build python-ldap
+  - libmariadbclient-dev    # required to build MySQL-python
+  - libpq-dev               # required to build psycopg2
+  - libsasl2-dev            # required to build python-ldap
+  - libsqlite3-dev          # required to build pysqlite
+  - libssl-dev              # required to build cryptography
+  - libvirt-dev             # required to build libvirt-python
+  - libxslt1-dev            # required to build lxml
+  - lxc-dev                 # required to build lxc-python2
+  - pkg-config
+  - python-dev
+  - swig
diff --git a/vars/debian.yml b/vars/ubuntu-16.04.yml
similarity index 87%
rename from vars/debian.yml
rename to vars/ubuntu-16.04.yml
index 824e8fb..d2e22e6 100644
--- a/vars/debian.yml
+++ b/vars/ubuntu-16.04.yml
@@ -16,6 +16,11 @@
 ## APT Cache options
 cache_timeout: 600
 
+# Ubuntu Cloud Archive variables
+uca_openstack_release: newton
+uca_repo_dist: "{{ ansible_lsb.codename }}-updates/{{ uca_openstack_release }}"
+uca_repo: "deb {{ uca_apt_repo_url }} {{ uca_repo_dist }} main"
+
 repo_build_packages:
   - build-essential
   - cmake