Changed docker to use a hosts file with various var files and to use roles.

docker/roles/docker/tasks/main.yaml

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+---
+# Tasks for docker role
+- name: Build barker image
+  docker_image:
+    name: barker:latest
+    build:
+      path: "/tmp/{{ host_directory }}/"
+      dockerfile: "/tmp/{{ host_directory }}/Dockerfile"
+      pull: yes
+    state: present
+    source: build
+
+- name: Create barker container
+  docker_container:
+    name: "{{ host_directory }}"
+    image: barker:latest
+    state: started
+    restart_policy: "unless-stopped"
+    env_file: "/var/lib/{{ host_directory }}/.env"
+    links:
+      - "postgres:db"
+      - "redis:redis"
+    published_ports:
+      - "127.0.0.1:{{ host_port }}:80"
+    volumes:
+      - "/var/lib/{{ host_directory }}/frontend:/frontend"

docker/roles/nginx/defaults/main.yaml

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+---
+# Default variables for Nginx role

docker/roles/nginx/handlers/main.yaml

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+---
+# Handlers for Nginx role
+- name: Reload Nginx
+  service:
+    name: nginx
+    state: reloaded

docker/roles/nginx/tasks/main.yaml

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+---
+# Tasks for Nginx role
+- name: Check if Nginx conf file exists
+  stat:
+    path: "/etc/nginx/sites-available/{{ http_conf }}"
+  register: status
+
+- name: No need to reload Nginx
+  debug:
+    msg: "No need to reload Nginx as sites-available entries have already been created"
+
+- name: Set Nginx conf file
+  when: status.stat.exists == false
+  template:
+    src: "files/nginx.conf.j2"
+    dest: "/etc/nginx/sites-available/{{ http_conf }}"
+
+- name: Enable new site
+  when: status.stat.exists == false
+  file:
+    src: "/etc/nginx/sites-available/{{ http_conf }}"
+    dest: "/etc/nginx/sites-enabled/{{ http_conf }}"
+    state: link
+  notify: Reload Nginx

docker/roles/upload/tasks/main.yaml

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+---
+# Tasks for upload role
+- name: Ensure Temporary Directory exists
+  file:
+      path: "/tmp/{{ host_directory }}"
+      state: directory
+
+- name: Copy dockerfile
+  synchronize:
+    src: app
+    dest: "/tmp/{{ host_directory }}"
+
+- name: Ensure Host Directory exists
+  file:
+      path: "/var/lib/{{ host_directory }}"
+      state: directory
+
+- name: Upload the .env file
+  template:
+    src: "{{ env_file }}"
+    dest: "/var/lib/{{ host_directory }}/.env"