Playbook to upgrade containers

Moved Ansible host requirements to 'ansible' role and created role
'upgrade' and playbook to help with upgrading containers.

.gitignore

@@ -2,4 +2,5 @@
 /*.yml
 /*.yaml
 !moxie.yml
+!upgrade-moxie.yml
 /environments/

moxie.yml

@@ -15,27 +15,8 @@
 - name: Install Moxie Server
   hosts: moxietest
   become: true
-
-  # Install host requirements for playbooks
-  pre_tasks:
-
-    - name: 'Install Ansible dependency: python-apt'
-      shell: 'apt-get update && apt-get install python-apt -y'
-      args:
-        creates: /usr/lib/python2.7/dist-packages/apt
-        warn: false
-
-    - name: 'Install Ansible dependency: aptitude'
-      apt:
-        name: 'aptitude'
-        state: present
-        force_apt_get: true
-
-    - name: 'Install Ansible dependency: python-docker'
-      apt:
-        name: python-docker
-
   roles:
+    - ansible
     - docker
     - traefik
     - wordpress

roles/ansible/tasks/main.yml

@@ -0,0 +1,16 @@
+- name: 'Install Ansible dependency: python-apt'
+  shell: 'apt-get update && apt-get install python-apt -y'
+  args:
+    creates: /usr/lib/python2.7/dist-packages/apt
+    warn: false
+
+- name: 'Install Ansible dependency: aptitude'
+  apt:
+    name: 'aptitude'
+    state: present
+    force_apt_get: true
+
+- name: 'Install Ansible dependency: python-docker'
+  apt:
+    name: python-docker
+    state: present

roles/upgrade/tasks/main.yml

@@ -0,0 +1,38 @@
+- name: Download new Traefik container
+  docker_image:
+    name: "traefik:{{ traefik_version }}"
+    source: pull
+  register: new_traefik
+
+- name: Download new WordPress container
+  docker_image:
+    name: "wordpress:{{ wordpress_version }}"
+    source: pull
+  register: new_wordpress
+
+- name: Download new MariaDB container
+  docker_image:
+    name: "mariadb:{{ mariadb_version }}"
+    source: pull
+  register: new_mariadb
+
+- name: Stop and remove old Traefik container
+  docker_container:
+    name: "{{ traefik_name }}"
+    image: "traefik:{{ traefik_version }}"
+    state: absent
+  when: new_traefik.changed
+
+- name: Stop and remove old WordPress container
+  docker_container:
+    name: "{{ wordpress_name }}"
+    image: "wordpress:{{ wordpress_version }}"
+    state: absent
+  when: new_wordpress.changed
+
+- name: Stop and remove old MariaDB container
+  docker_container:
+    name: "{{ mariadb_name }}"
+    image: "mariadb:{{ mariadb_version }}"
+    state: absent
+  when: new_mariadb.changed

upgrade-moxie.yml

@@ -0,0 +1,7 @@
+- name: Upgrade Moxie Server
+  hosts: moxietest
+  become: true
+  roles:
+    - upgrade
+    - traefik
+    - wordpress