added role docker_host

roles/docker_host/tasks/CentOS.yml

@@ -0,0 +1,26 @@
+- name: Copy Docker GPG Public Key.
+  copy:
+    src: "docker-ce.gpg"
+    dest: '/etc/yum.repos.d/docker-ce.gpg'
+    owner: root
+    group: root
+    mode: 0644
+
+- name: Add Docker GPG key.
+  rpm_key:
+    key: "/etc/yum.repos.d/docker-ce.gpg"
+    state: present
+  when: ansible_distribution == "RedHat"
+
+- name: Add Docker repository.
+  copy:
+    src: "docker-ce.repo"
+    dest: '/etc/yum.repos.d/docker-ce.repo'
+    owner: root
+    group: root
+    mode: 0644
+
+- name: Install python-selinux
+  yum:
+    state: present
+    name: "libselinux-python3"