Add resolved to the networkd setup

If the new variable systemd_resolved is defined, resolved will be setup
within the environment. This will configure the global configuration
file and restart the service.

A test has been added to ensure this code path is exercised on every
commit. It should be noted that suse does not have a resolved package so
this functionality is disabled when a suse system is encountered. This
should be revised as soon as suse has resolved available.

Change-Id: I85278719bc5b7158244fd44c65d4366935555780
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

defaults/main.yml

@@ -107,3 +107,15 @@ systemd_netdevs: []
 #         ConfigureWithoutCarrier: true
 
 systemd_networks: []
+
+# The systemd resolved service can be setup using th following configuration.
+# The generator is a Key=Value pair hash and will set whatever directives it's
+# instructed to. For more information on all of the possible configuration see
+# https://www.freedesktop.org/software/systemd/man/resolved.conf.html
+
+# systemd_resolved:
+#   DNS: "10.127.83.1"
+#   FallbackDNS: "208.67.222.222 8.8.8.8"
+#   Cache: yes
+
+systemd_resolved: {}

handlers/main.yml

@@ -23,5 +23,16 @@
   tags:
     - systemd-networkd
 
+- name: Restart systemd-resolved
+  systemd:
+    name: "systemd-resolved"
+    daemon_reload: yes
+    state: restarted
+  when:
+    - systemd_resolved_available | bool
+  tags:
+    - systemd-networkd
+    - systemd-resolved
+
 - name: Update initramfs
   command: "{{ systemd_networkd_update_initramfs }}"

tasks/main.yml

@@ -73,6 +73,20 @@
   tags:
     - systemd-networkd
 
+- name: Create systemd-resolved config
+  template:
+    src: "systemd-resolved.conf.j2"
+    dest: "/etc/systemd/resolved.conf"
+    owner: "root"
+    group: "root"
+    mode: "0644"
+  when:
+    - systemd_resolved
+  notify:
+    - Restart systemd-resolved
+  tags:
+    - systemd-resolved
+
 - name: Run interface cleanup script
   command: "/usr/local/bin/interface-cleanup"
   failed_when: false

templates/systemd-resolved.conf.j2

@@ -0,0 +1,4 @@
+[Resolve]
+{% for key, value in systemd_resolved.items() %}
+{{ key }}={{ value }}
+{% endfor %}

tests/test.yml

@@ -27,10 +27,11 @@
       pause:
         seconds: 15
   vars:
-    systemd_networkd_distro_packages:
-      yum:
-        - systemd-networkd
     systemd_run_networkd: yes
+    systemd_resolved:
+      DNS: "208.67.222.222"
+      FallbackDNS: "8.8.8.8"
+      Cache: yes
     systemd_netdevs:
       - NetDev:
           Name: dummy0

vars/redhat-7.yml

@@ -15,5 +15,8 @@
 
 systemd_networkd_distro_packages:
   - systemd-networkd
+  - systemd-resolved
+
+systemd_resolved_available: true
 
 systemd_networkd_update_initramfs: "dracut -f"

vars/suse-42.yml

@@ -13,4 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+systemd_resolved_available: false
+
 systemd_networkd_update_initramfs: "dracut -f"

vars/ubuntu-16.04.yml

@@ -13,4 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+systemd_resolved_available: true
+
 systemd_networkd_update_initramfs: "/usr/sbin/update-initramfs -u"