add centos support

Author: Gustavo Muniz do Carmo

meta/main.yml

@@ -14,7 +14,6 @@ galaxy_info:
     - name: CentOS
       versions:
         - 7
-        - 8
 
   galaxy_tags:
     - docker

molecule/default/molecule.yml

@@ -18,10 +18,6 @@ platforms:
     image: centos:7
     groups:
       - centos
-  - name: centos8
-    image: centos:8
-    groups:
-      - centos
 provisioner:
   name: ansible
   lint:

molecule/default/tests/test_default.py

@@ -3,7 +3,7 @@
 import testinfra.utils.ansible_runner
 
 testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
-    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('ubuntu')
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
 
 
 def test_docker_is_installed(host):

tasks/centos.yml

@@ -1,8 +1,15 @@
 ---
-- name: Install required packages
+- name: Add Docker yum repository
+  yum_repository:
+    file: docker-ce
+    name: docker-ce-stable
+    description: Docker CE Stable - $basearch
+    baseurl: https://download.docker.com/linux/centos/7/$basearch/stable
+    enabled: yes
+    gpgcheck: yes
+    gpgkey: https://download.docker.com/linux/centos/gpg
+
+- name: Install Docker
   yum:
-    name: "{{ item }}"
-  loop:
-    - yum-utils
-    - device-mapper-persistent-data
-    - lvm2
+    name: docker-ce
+    update_cache: yes