backport the docker role from github.com/nmasse-itix/OpenShift-Lab

roles/docker/defaults/main.yml

@@ -0,0 +1,2 @@
+---
+  docker_storage_driver: overlay2

roles/docker/tasks/main.yml

@@ -1,12 +1,13 @@
 ---
 
-  - name: Check for mandatory variables required by this playbook
+  - name: Make sure the extra repos is enabled
-    fail:
+    command: subscription-manager repos --enable rhel-7-server-extras-rpms
-      msg: "This playbook requires {{item}} to be set."
+    when: "ansible_os_family == 'RedHat' and not is_offline|default(False)|bool"
-    when: "item is not defined or item == ''"
+    tags: rpm
-    with_items:
+
-    - docker_storage_vg
+  - name: Install a missing dependency of Docker
-    tags: docker-storage
+    yum: name=python-setuptools state=installed
+    tags: rpm
 
   - name: Install Docker
     yum: name=docker state=installed
@@ -15,24 +16,17 @@
   - name: Start docker
     service: name=docker state=started
     tags: docker-storage
-    when: 'docker_storage_setup_needs_to_run is not defined'
 
-  - name: Determine if docker storage driver == devicemapper
+  - name: Determine if the docker storage driver is the correct one
     shell: docker info
     register: docker_info
     changed_when: false
-    when: 'docker_storage_setup_needs_to_run is not defined'
 
   - name: set docker_storage_setup_needs_to_run
     set_fact:
-      docker_storage_setup_needs_to_run: '{{ docker_info.stdout.find(''Storage Driver: devicemapper'') == -1 or docker_info.stdout.find(''Data file: /dev/loop'') != -1 }}'
+      docker_storage_setup_needs_to_run: '{{ docker_info.stdout.find(''Storage Driver: '' ~ docker_storage_driver) == -1 or docker_info.stdout.find(''Data file: /dev/loop'') != -1 }}'
-    when: 'docker_storage_setup_needs_to_run is not defined'
     tags: docker-storage
 
-  - name: Cleanup the existing docker-storage state
-    file: state=absent path=/etc/sysconfig/docker-storage
-    when: docker_storage_setup_needs_to_run
-
   - name: stop docker
     service:
       name: docker
@@ -45,7 +39,7 @@
     when: docker_storage_setup_needs_to_run
     tags: docker-storage
 
-  - name: Configure docker-storage-setup to use LVM
+  - name: Configure docker-storage-setup to use the correct storage driver
     template: dest=/etc/sysconfig/docker-storage-setup src=docker-storage-setup
     register: docker-storage-setup
     when: docker_storage_setup_needs_to_run

roles/docker/templates/docker-storage-setup

@@ -1,27 +1,10 @@
-STORAGE_DRIVER=devicemapper
+STORAGE_DRIVER={{ docker_storage_driver }}
+{% if docker_storage_driver == 'devicemapper' %}
 DOCKER_ROOT_VOLUME=yes
-
+{% if docker_storage_disk is defined %}
+DEVS={{ docker_storage_disk }}
+{% endif %}
 {% if docker_storage_vg is defined %}
 VG={{ docker_storage_vg }}
 {% endif %}
-
+{% endif %}
-# Enable automatic extension of pool by lvm. lvm can monitor
-# the pool and automatically extend it when pool is getting full.
-AUTO_EXTEND_POOL=true
-
-# Determines the pool extension threshold in terms of percentage
-# of pool size. For example, if threshold is 60, that means when
-# pool is 60% full, threshold has been hit.
-POOL_AUTOEXTEND_THRESHOLD=80
-
-# Determines the amount by which pool needs to be grown. This is
-# specified in terms of % of pool size. So a value of 20 means
-# that when threshold is hit, pool will be grown by 20% of existing
-# pool size.
-POOL_AUTOEXTEND_PERCENT=20
-
-# Create a Logical Volume of 20G for /var/lib/docker
-DOCKER_ROOT_VOLUME_SIZE=20G
-
-# Create a Thinpool Logical Volume of 50G for Container Storage
-DATA_SIZE=50G