Initial commit.

.travis.yml

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+---
+services: docker
+
+env:
+  - distro: centos7
+    init: /usr/lib/systemd/systemd
+    run_opts: "--privileged --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro"
+  - distro: ubuntu1604
+    init: /lib/systemd/systemd
+    run_opts: "--privileged --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro"
+  - distro: ubuntu1404
+    init: /sbin/init
+    run_opts: ""
+
+before_install:
+  # Pull container.
+  - 'docker pull geerlingguy/docker-${distro}-ansible:latest'
+
+script:
+  - container_id=$(mktemp)
+  # Run container in detached state.
+  - 'docker run --detach --volume="${PWD}":/etc/ansible/roles/role_under_test:ro ${run_opts} geerlingguy/docker-${distro}-ansible:latest "${init}" > "${container_id}"'
+
+  # Ansible syntax check.
+  - 'docker exec --tty "$(cat ${container_id})" env TERM=xterm ansible-playbook /etc/ansible/roles/role_under_test/tests/test.yml --syntax-check'
+
+  # Test role.
+  - 'docker exec "$(cat ${container_id})" ansible-playbook /etc/ansible/roles/role_under_test/tests/test.yml'
+
+  # Test role idempotence.
+  - idempotence=$(mktemp)
+  - docker exec "$(cat ${container_id})" ansible-playbook /etc/ansible/roles/role_under_test/tests/test.yml | tee -a ${idempotence}
+  - >
+    tail ${idempotence}
+    | grep -q 'changed=0.*failed=0'
+    && (echo 'Idempotence test: pass' && exit 0)
+    || (echo 'Idempotence test: fail' && exit 1)
+
+  # TODO: Test whether Docker is running correctly.
+
+notifications:
+  webhooks: https://galaxy.ansible.com/api/v1/notifications/

README.md

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+# Ansible Role: Docker
+
+[![Build Status](https://travis-ci.org/geerlingguy/ansible-role-docker.svg?branch=master)](https://travis-ci.org/geerlingguy/ansible-role-docker)
+
+An Ansible Role that installs [Docker](https://www.docker.com) on Debian/Ubuntu.
+
+## Requirements
+
+None.
+
+## Role Variables
+
+Available variables are listed below, along with default values (see `defaults/main.yml`):
+
+    TODO.
+
+TODO.
+
+## Dependencies
+
+None.
+
+## Example Playbook
+
+    - hosts: all
+      roles:
+        - geerlingguy.docker
+
+## License
+
+MIT / BSD
+
+## Author Information
+
+This role was created in 2017 by [Jeff Geerling](https://www.jeffgeerling.com/), author of [Ansible for DevOps](https://www.ansiblefordevops.com/).

defaults/main.yml

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+---
+docker_package: "docker-engine"
+
+# Used only for Debian/Ubuntu. Add 'testing' if you don't want stable.
+docker_apt_repository: "deb https://apt.dockerproject.org/repo {{ ansible_distribution|lower }}-{{ ansible_distribution_release }} main"

handlers/main.yml

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+---
+- name: restart docker
+  service: name=docker state=restarted

meta/main.yml

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+---
+dependencies: []
+
+galaxy_info:
+  author: geerlingguy
+  description: Docker for Linux.
+  company: "Midwestern Mac, LLC"
+  license: "license (BSD, MIT)"
+  min_ansible_version: 2.0
+  platforms:
+  - name: EL
+    versions:
+    - 6
+    - 7
+  - name: Debian
+    versions:
+    - jessie
+  - name: Ubuntu
+    versions:
+    - trusty
+    - xenial
+  galaxy_tags:
+    - web
+    - system
+    - containers
+    - docker
+    - orchestration
+    - compose
+    - server

tasks/main.yml

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+---
+- include: setup-RedHat.yml
+  when: ansible_os_family == 'RedHat'
+
+- include: setup-Debian.yml
+  when: ansible_os_family == 'Debian'
+
+- name: Install Docker.
+  package: name={{ docker_package }} state=present
+
+- name: Ensure Docker is started and enabled at boot.
+  service:
+    name: docker
+    state: started
+    enabled: yes

tasks/setup-Debian.yml

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+---
+- name: Ensure depdencies are installed.
+  apt:
+    name: "{{ item }}"
+    state: present
+  with_items:
+    - apt-transport-https
+    - ca-certificates
+
+- name: Add Docker apt key.
+  apt_key:
+    url: https://apt.dockerproject.org/gpg
+    id: 58118E89F3A912897C070ADBF76221572C52609D
+    state: present
+
+- name: Add Docker repository.
+  apt_repository:
+    repo: "{{ docker_apt_repository }}"
+    state: present
+    update_cache: yes

tasks/setup-RedHat.yml

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+---
+# - name: Add Docker GPG key.
+#   rpm_key:
+#     key: https://apt.dockerproject.org/gpg
+#     state: present
+
+- name: Add Docker repository.
+  yum_repository:
+    name: docker
+    description: Docker repository.
+    baseurl: https://docs.docker.com/engine/installation/linux/repo_files/centos/docker.repo
+    gpgkey: https://apt.dockerproject.org/gpg
+    gpgcheck: yes

tests/test.yml

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+---
+- hosts: all
+
+  pre_tasks:
+    - name: Update apt cache.
+      apt: update_cache=yes cache_valid_time=600
+      when: ansible_os_family == 'Debian'
+
+    - name: Install test dependencies.
+      package: name=curl state=present
+
+  roles:
+    - role_under_test