Fix docker install on rhel7

roles/docker/files/rh_docker.repo

+[dockerrepo]
+name=Docker Repository
+baseurl=https://yum.dockerproject.org/repo/main/centos/7
+enabled=1
+gpgcheck=1
+gpgkey=https://yum.dockerproject.org/gpg

roles/docker/tasks/main.yml

@@ -38,6 +38,13 @@
   with_items: "{{ docker_repo_info.repos }}"
   when: docker_repo_info.repos|length > 0
 
+- name: Configure docker repository on RedHat
+  copy:
+    src: "rh_docker.repo"
+    dest: "/etc/yum.repos.d/docker.repo"
+  when: ansible_distribution == "RedHat" and
+        ansible_distribution_major_version > 7
+
 - name: ensure docker packages are installed
   action: "{{ docker_package_info.pkg_mgr }}"
   args:
@@ -53,7 +60,7 @@
     regexp: '^DOCKER_STORAGE_OPTIONS=.*$'
     state: present
     backup: yes
-  when: ansible_os_family == "RedHat"
+  when: ansible_distribution == "CentOS"
 
 - meta: flush_handlers
 

roles/docker/vars/redhat.yml

@@ -3,7 +3,7 @@ docker_kernel_min_version: '0'
 docker_package_info:
   pkg_mgr: yum
   pkgs:
-    - docker
+    - docker-engine
 
 docker_repo_key_info:
   pkg_key: ''

roles/kubernetes/preinstall/tasks/main.yml

@@ -78,16 +78,12 @@
         ansible_distribution_major_version > 21
   changed_when: False
 
-- name: Install epel-release on RHEL
-  command: rpm -ivh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
-  when: ansible_distribution == "RedHat"
-
-- name: Install epel-release on CentOS
+- name: Install epel-release on RedHat/CentOS
   action:
     module: "{{ ansible_pkg_mgr }}"
     name: "epel-release"
     state: latest
-  when: ansible_distribution == "CentOS"
+  when: ansible_distribution in ['CentOS', 'RedHat']
 
 - name: Install packages requirements
   action: