install docker on a largest number of linux distribution (based on https://github.com/marklee77/ansible-role-docker)

roles/docker/tasks/configure.yml

@@ -1,16 +0,0 @@
----
-- name: enable docker
-  service:
-    name: docker
-    enabled: yes
-    state: started
-  tags:
-    - docker
-
-#- name: login to arkena's docker registry
-#  shell : >
-#    docker login --username={{ dockerhub_user }}
-#    --password={{ dockerhub_pass }}
-#    --email={{ dockerhub_email }}
-
-- meta: flush_handlers

roles/docker/tasks/install.yml

@@ -1,24 +0,0 @@
----
-- name: Install prerequisites for https transport
-  apt: pkg={{ item }} state=present update_cache=yes
-  with_items:
-    - apt-transport-https
-    - ca-certificates
-
-- name: Configure docker apt repository
-  template: src=docker.list.j2 dest=/etc/apt/sources.list.d/docker.list backup=yes
-
-- name: Install docker-engine
-  apt: pkg={{ item }} state=present force=yes update_cache=yes
-  with_items:
-    - aufs-tools
-    - cgroupfs-mount
-    - docker-engine=1.9.1-0~{{ ansible_distribution_release }}
-
-- name: Copy default docker configuration
-  template: src=default-docker.j2 dest=/etc/default/docker backup=yes
-  notify: restart docker
-
-- name: Copy Docker systemd unit file
-  copy: src=systemd-docker.service dest=/lib/systemd/system/docker.service backup=yes
-  notify: restart docker

roles/docker/tasks/main.yml

@@ -1,3 +1,53 @@
 ---
-- include: install.yml
-- include: configure.yml
+- name: gather os specific variables
+  include_vars: "{{ item }}"
+  with_first_found:
+    - files:
+      - "{{ ansible_distribution|lower }}-{{ ansible_distribution_version|lower|replace('/', '_') }}.yml"
+      - "{{ ansible_distribution|lower }}-{{ ansible_distribution_release }}.yml"
+      - "{{ ansible_distribution|lower }}-{{ ansible_distribution_major_version|lower|replace('/', '_') }}.yml"
+      - "{{ ansible_distribution|lower }}.yml"
+      - "{{ ansible_os_family|lower }}.yml"
+      - defaults.yml
+      paths:
+      - ../vars
+
+- name: check for minimum kernel version
+  fail:
+    msg: >
+          docker requires a minimum kernel version of
+          {{ docker_kernel_min_version }} on
+          {{ ansible_distribution }}-{{ ansible_distribution_version }}
+  when: ansible_kernel|version_compare(docker_kernel_min_version, "<")
+
+- name: ensure docker requirements packages are installed
+  action: "{{ docker_package_info.pkg_mgr }}"
+  args: docker_package_info.args
+  with_items: docker_package_info.pre_pkgs
+  when: docker_package_info.pre_pkgs|length > 0
+
+- name: ensure docker repository public key is installed
+  action: "{{ docker_repo_key_info.pkg_key }}"
+  args: docker_repo_key_info.args
+  with_items: docker_repo_key_info.repo_keys
+  when: docker_repo_key_info.repo_keys|length > 0
+
+- name: ensure docker repository is enabled
+  action: "{{ docker_repo_info.pkg_repo }}"
+  args: docker_repo_info.args
+  with_items: docker_repo_info.repos
+  when: docker_repo_info.repos|length > 0
+
+- name: ensure docker packages are installed
+  action: "{{ docker_package_info.pkg_mgr }}"
+  args: docker_package_info.args
+  with_items: docker_package_info.pkgs
+  when: docker_package_info.pkgs|length > 0
+
+- name: ensure docker service is started and enabled
+  service:
+    name: "{{ item }}"
+    enabled: yes
+    state: started
+  with_items:
+    - docker