Merge pull request #256 from Zempashi/issue-90

Ability to configure Docker daemon options

README.md

@@ -60,6 +60,13 @@ Usually in combination with changing `docker_yum_repository` as well.
 
 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

@@ -31,3 +31,6 @@ docker_yum_gpg_key: "{{ docker_repo_url }}/centos/gpg"
 
 # A list of users who will be added to the docker group.
 docker_users: []
+
+# Docker daemon options as a dict
+docker_daemon_options: {}

tasks/main.yml

@@ -12,6 +12,21 @@
   notify: restart docker
   ignore_errors: "{{ ansible_check_mode }}"
 
+- name: Ensure /etc/docker/ directory exists.
+  file:
+    path: /etc/docker
+    state: directory
+    mode: 0755
+  when: docker_daemon_options.keys() | length > 0
+
+- name: Configure Docker daemon options.
+  copy:
+    content: "{{ docker_daemon_options | to_nice_json }}"
+    dest: /etc/docker/daemon.json
+    mode: 0644
+  when: docker_daemon_options.keys() | length > 0
+  notify: restart docker
+
 - name: Ensure Docker is started and enabled at boot.
   service:
     name: docker