library/roles/docker: Update the docker role.

docker/defaults/main.yml

@@ -0,0 +1,13 @@
+---
+docker_install: False
+docker_swarm: False
+docker_repo_key: '58118E89F3A912897C070ADBF76221572C52609D'
+docker_repo_keyserver: 'hkp://ha.pool.sks-keyservers.net:80'
+# Set to the Debian distribution name if not Ubuntu
+docker_distribution: '{{ ansible_distribution_release | lower }}'
+docker_repo: 'deb https://apt.dockerproject.org/repo {{ ansible_distribution }}-{{ docker_distribution }} main'
+
+docker_pkg_status: latest
+docker_packages:
+  - docker-engine
+

docker/tasks/main.yml

@@ -4,4 +4,5 @@
 - name: Enable Docker TCP on local bridge (for docker swarm)
   action: configfile path=/etc/default/docker syntax=shell key=DOCKER_OPTS value="\"-H tcp://172.17.42.1:2375 -H unix:///var/run/docker.sock\"" 
   notify: Restart docker
+  when: docker_swarm
   tags: docker-conf

docker/tasks/pkgs.yml

@@ -1,16 +1,34 @@
 ---
-- name: Add Docker repository key
-  apt_key: url="https://get.docker.io/gpg"
-  tags:
-    - docker
+- block:
+    - name: Add the Docker repository key
+      apt_key: keyserver={{ docker_repo_keyserver }} id=docker_repo_key state=present
 
-- name: Add Docker repository
-  apt_repository: repo='deb http://get.docker.io/ubuntu docker main' update_cache=yes
-  tags:
-    - docker
+    - name: Add the Docker repository
+      apt_repository: repo='{{ docker_repo }}' update_cache=yes
 
     - name: Install Docker
-  apt: pkg=lxc-docker state=present
-  tags:
-    - docker
+      apt: pkg={{ item }} state={{ docker_pkg_status }} update_cache=yes cache_valid_time=3600
+      with_items: '{{ docker_packages }}'
 
+    - name: Ensure that the service is started and enabled
+      service: name=docker state=started enabled=yes
+
+  when: docker_install 
+  tags: docker 
+
+- block:
+    - name: Ensure that the service is stopped and disabled
+      service: name=docker state=stopped enabled=no
+
+    - name: Remove the Docker package
+      apt: pkg={{ item }} state=absent
+      with_items: '{{ docker_packages }}'
+
+    - name: Remove the Docker repository key
+      apt_key: keyserver={{ docker_repo_keyserver }} id=docker_repo_key state=absent
+
+    - name: Remove the Docker repository
+      apt_repository: repo='{{ docker_repo }}' state=absent update_cache=yes
+
+  when: not docker_install 
+  tags: docker