use docker repository to install on CentOS

roles/docker/tasks/main.yml

@@ -38,12 +38,12 @@
   with_items: "{{ docker_repo_info.repos }}"
   when: docker_repo_info.repos|length > 0
 
-- name: Configure docker repository on RedHat
+- name: Configure docker repository on RedHat/CentOS
   copy:
     src: "rh_docker.repo"
     dest: "/etc/yum.repos.d/docker.repo"
-  when: ansible_distribution == "RedHat" and
-        ansible_distribution_major_version > 7
+  when: ansible_distribution in ["CentOS","RedHat"] and
+        ansible_distribution_major_version >= 7
 
 - name: ensure docker packages are installed
   action: "{{ docker_package_info.pkg_mgr }}"
@@ -53,15 +53,6 @@
   with_items: "{{ docker_package_info.pkgs }}"
   when: docker_package_info.pkgs|length > 0
 
-- name: Centos needs xfs storage type for devicemapper if used
-  lineinfile:
-    dest: /etc/sysconfig/docker-storage
-    line: "DOCKER_STORAGE_OPTIONS='--storage-opt dm.fs=xfs'"
-    regexp: '^DOCKER_STORAGE_OPTIONS=.*$'
-    state: present
-    backup: yes
-  when: ansible_distribution == "CentOS"
-
 - meta: flush_handlers
 
 - name: ensure docker service is started and enabled