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

roles/common/defaults/main.yml

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+---
+etcd_version: v2.2.2
+flannel_version: 0.5.5
+
+kube_version: v1.1.3
+kubectl_checksum: "01b9bea18061a27b1cf30e34fd8ab45cfc096c9a9d57d0ed21072abb40dd3d1d"
+kubelet_checksum: "62191c66f2d670dd52ddf1d88ef81048977abf1ffaa95ee6333299447eb6a482"
+
+calico_version: v0.13.0
+calico_plugin_version: v0.7.0
+
+etcd_download_url: "https://github.com/coreos/etcd/releases/download"
+flannel_download_url: "https://github.com/coreos/flannel/releases/download"
+kube_download_url: "https://storage.googleapis.com/kubernetes-release/release/{{ kube_version }}/bin/linux/amd64"
+calico_download_url: "https://github.com/Metaswitch/calico-docker/releases/download"
+calico_plugin_download_url: "https://github.com/projectcalico/calico-kubernetes/releases/download/{{calico_plugin_version}}/calico_kubernetes"
+
+ansible_python_interpreter: PATH="{{ ansible_user_dir }}"/bin:$PATH python
+pip_python_modules:
+  - httplib2

roles/common/tasks/calico.yml

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+---
+- name: Create calico release directory
+  local_action: file
+     path={{ local_release_dir }}/calico/bin
+     recurse=yes
+     state=directory
+  delegate_to: "{{ groups['kube-master'][0] }}"
+
+- name: Check if calicoctl has been downloaded
+  local_action: stat
+     path={{ local_release_dir }}/calico/bin/calicoctl
+  register: c_tar
+  delegate_to: "{{ groups['kube-master'][0] }}"
+
+# issues with get_url module and redirects, to be tested again in the near future
+- name: Download calico
+  local_action: shell
+    curl -o {{ local_release_dir }}/calico/bin/calicoctl -Ls {{ calico_download_url }}/{{ calico_version }}/calicoctl
+  when: not c_tar.stat.exists
+  register: dl_calico
+  delegate_to: "{{ groups['kube-master'][0] }}"
+
+
+- name: Download calico-kubernetes-plugin
+  local_action: get_url
+    url="{{calico_plugin_download_url}}"
+    dest="{{ local_release_dir }}/calico/bin/calico"

roles/common/tasks/flannel.yml

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+---
+- name: Create flannel release directory
+  local_action: file
+     path={{ local_release_dir }}/flannel
+     recurse=yes
+     state=directory
+  delegate_to: "{{ groups['kube-master'][0] }}"
+
+- name: Check if flannel release archive has been downloaded
+  local_action: stat
+     path={{ local_release_dir }}/flannel/flannel-{{ flannel_version }}-linux-amd64.tar.gz
+  register: f_tar
+  delegate_to: "{{ groups['kube-master'][0] }}"
+
+# issues with get_url module and redirects, to be tested again in the near future
+- name: Download flannel
+  local_action: shell
+    curl -o {{ local_release_dir }}/flannel/flannel-{{ flannel_version }}-linux-amd64.tar.gz -Ls {{ flannel_download_url }}/v{{ flannel_version }}/flannel-{{ flannel_version }}-linux-amd64.tar.gz
+  when: not f_tar.stat.exists
+  register: dl_flannel
+  delegate_to: "{{ groups['kube-master'][0] }}"
+
+- name: Extract flannel archive
+  local_action: unarchive
+     src={{ local_release_dir }}/flannel/flannel-{{ flannel_version }}-linux-amd64.tar.gz
+     dest={{ local_release_dir }}/flannel copy=no
+  when: dl_flannel|changed
+  delegate_to: "{{ groups['kube-master'][0] }}"
+
+- name: Pick up only flannel binaries
+  local_action: copy
+     src={{ local_release_dir }}/flannel/flannel-{{ flannel_version }}/flanneld
+     dest={{ local_release_dir }}/flannel/bin
+  when: dl_flannel|changed
+
+- name: Delete unused flannel files
+  local_action: file
+     path={{ local_release_dir }}/flannel/flannel-{{ flannel_version }} state=absent
+  when: dl_flannel|changed

roles/common/tasks/kubernetes.yml

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+---
+- name: Create kubernetes binary directory
+  local_action: file
+     path="{{ local_release_dir }}/kubernetes/bin"
+     state=directory
+     recurse=yes
+
+- name: Download kubelet and kubectl
+  local_action: get_url
+    url="{{ kube_download_url }}/{{ item.name }}"
+    dest="{{ local_release_dir }}/kubernetes/bin"
+    sha256sum="{{ item.checksum }}"
+  with_items:
+    - name: kubelet
+      checksum: "{{ kubelet_checksum }}"
+    - name: kubectl
+      checksum: "{{ kubectl_checksum }}"

roles/common/tasks/main.yml

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+---
+- include: download.yml
+  delegate_to: localhost
+  when: inventory_hostname == "{{ groups['kube-master'][0] }}"
+
+- include: pip-bootstrap.yml
+
+- name: Install httplib2 python module
+  pip:
+    executable: "{{ ansible_user_dir }}/bin/pip"
+    name: "{{ item }}"
+  with_items: pip_python_modules