Restart Docker daemon if config changed

roles/docker/defaults/main.yml

@@ -1,3 +1,4 @@
+# vim: ft=yaml.ansible
 ---
 base_domain: sapti.me
 base_volume: "{{ hdd_mount_point }}/apps"

roles/docker/tasks/main.yml

@@ -1,3 +1,4 @@
+# vim: ft=yaml.ansible
 ---
 - name: Add Docker PGP key
   apt_key:
@@ -36,13 +37,6 @@
       - docker
       - docker-compose
 
-- name: Copy Docker daemon config file
-  template:
-    src: daemon.json.j2
-    dest: /etc/docker/daemon.json
-    owner: root
-    mode: u=rw,g=r,o=r
-
 - name: Set up Docker services
   import_tasks: services.yml
   tags:

roles/docker/tasks/services.yml

@@ -1,10 +1,18 @@
 # vim: ft=yaml.ansible
 ---
-- name: Start but disable Docker daemon
+- name: Copy Docker daemon config file
+  template:
+    src: daemon.json.j2
+    dest: /etc/docker/daemon.json
+    owner: root
+    mode: u=rw,g=r,o=r
+  register: daemon_config
+
+- name: (Disable and) start Docker daemon
   service:
     name: "{{ item }}"
     enabled: false
-    state: started
+    state: "{{ 'restarted' if daemon_config.changed else 'started' }}"
   loop:
     - docker.socket
     - docker.service

roles/os_config/defaults/main.yml

@@ -1,2 +1,3 @@
+# vim: ft=yaml.ansible
 ---
 ssh_key: ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPd/4fQV7CL8/KVwbo/phiV5UdXFBIDlkZ+ps8C7FeRf

roles/os_config/tasks/main.yml

@@ -1,3 +1,4 @@
+# vim: ft=yaml.ansible
 ---
 - name: Configure system packages
   import_tasks: pkgs.yml