Clean override of docker systemd unit

This hack is still unfortunately needed in stretch…

docker-host/tasks/main.yml

@@ -46,15 +46,20 @@
   template:
     src: daemon.json.j2
     dest: /etc/docker/daemon.json
-  notify:
+  notify: restart docker
-    - reload systemd
-    - restart docker
 
-- name: Remove options from docker systemd service
+- name: Create override directory for docker unit
-  lineinfile:
+  file:
-    dest: /lib/systemd/system/docker.service
+    name: /etc/systemd/system/docker.service.d/
-    regexp: '^ExecStart='
+    state: directory
-    line: 'ExecStart=/usr/bin/dockerd'
+    mode: "0755"
+
+- name: Remove options in ExecStart from docker unit
+  copy:
+    src: docker.conf
+    dest: /etc/systemd/system/docker.service.d/
+    mode: "0644"
+  notify: reload systemd
 
 - name: Creating Docker tmp directory
   file: