Ability to configure Docker daemon options

README.md

@@ -52,6 +52,13 @@ Docker Compose installation options.
 
 A list of system users to be added to the `docker` group (so they can use Docker on the server).
 
+    docker_daemon_options:
+      storage-driver: "devicemapper"
+      log-opts:
+        max-size: "100m"
+
+Custom `dockerd` options can be configured through this dictionary representing the json file `/etc/docker/daemon.json`.
+
 ## Use with Ansible (and `docker` Python library)
 
 Many users of this role wish to also use Ansible to then _build_ Docker images and manage Docker containers on the server where Docker is installed. In this case, you can easily add in the `docker` Python library using the `geerlingguy.pip` role:

defaults/main.yml

@@ -27,3 +27,6 @@ docker_yum_repo_enable_test: 0
 
 # A list of users who will be added to the docker group.
 docker_users: []
+
+# Docker daemon options
+docker_daemon_options: {}

tasks/main.yml

@@ -17,6 +17,18 @@
     state: "{{ docker_service_state }}"
     enabled: "{{ docker_service_enabled }}"
 
+- name: Ensure /etc/docker/ directory exists.
+  file:
+    path: /etc/docker
+    state: directory
+
+- name: Configure docker daemon options.
+  copy:
+    content: "{{ docker_daemon_options | to_nice_json }}"
+    dest: /etc/docker/daemon.json
+    mode: 0644
+  notify: restart docker
+
 - name: Ensure handlers are notified now to avoid firewall conflicts.
   meta: flush_handlers