Broke apart the playbook into roles.

iot/roles/nodered/tasks/main.yaml

@@ -0,0 +1,37 @@
+---
+- getent:
+    database: passwd
+    key: "{{ nodered_user }}"
+    split: ":"
+
+# Tasks for Node-RED role
+- name: Pull Node Red image
+  docker_image:
+    name: "{{ nodered_image }}"
+    source: pull
+    force_source: yes
+
+- name: Ensure Node Red Directory exists
+  file:
+      path: "{{ nodered_directory }}"
+      state: directory
+      group: "{{ nodered_user }}"
+      owner: "{{ nodered_user }}"
+      mode: 0755
+
+- name: Create Node Red container
+  docker_container:
+    name: "{{ nodered_container }}"
+    image: "{{ nodered_image }}"
+    state: started
+    restart_policy: "unless-stopped"
+    user: "{{ getent_passwd[nodered_user][1] }}:{{ getent_passwd[nodered_user][2] }}"
+    env:
+      TZ: "Asia/Kolkata"
+    links:
+      - "{{ mosquitto_container }}:mqtt"
+      - "{{ influx_container }}:influx"
+    published_ports:
+      - 127.0.0.1:1880:1880
+    volumes:
+      - "{{ nodered_directory }}:/data"