Get installation working on CentOS, add Debian 8 test.

.travis.yml

@@ -8,9 +8,9 @@ env:
   - distro: ubuntu1604
     init: /lib/systemd/systemd
     run_opts: "--privileged --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro"
-  - distro: ubuntu1404
-    init: /sbin/init
-    run_opts: ""
+  - distro: debian8
+    init: /lib/systemd/systemd
+    run_opts: "--privileged --volume=/sys/fs/cgroup:/sys/fs/cgroup:ro"
 
 before_install:
   # Pull container.

defaults/main.yml

@@ -3,3 +3,6 @@ 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"
+
+# Used only for RedHat/CentOS.
+docker_yum_repo_version: 'main' # 'testing', 'beta', 'nightly'

tasks/setup-RedHat.yml

@@ -1,13 +1,13 @@
 ---
-# - name: Add Docker GPG key.
-#   rpm_key:
-#     key: https://apt.dockerproject.org/gpg
-#     state: present
+- name: Add Docker GPG key.
+  rpm_key:
+    key: https://yum.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
+  template:
+    src: 'docker.repo.j2'
+    dest: '/etc/yum.repos.d/docker.repo'
+    owner: root
+    group: root
+    mode: 0644

templates/docker.repo.j2

@@ -0,0 +1,6 @@
+[docker-{{ docker_yum_repo_version }}]
+name=Docker Repository
+baseurl=https://yum.dockerproject.org/repo/{{ docker_yum_repo_version }}/{{ ansible_distribution|lower }}/{{ ansible_distribution_version.split(".")[0]|int }}/
+enabled=1
+gpgcheck=1
+gpgkey=https://yum.dockerproject.org/gpg