create molecule scenario for monitoring role

roles/monitoring/molecule/default/INSTALL.rst

@@ -0,0 +1,23 @@
+*********************************
+Vagrant driver installation guide
+*********************************
+
+Requirements
+============
+
+* Vagrant
+* Virtualbox, Parallels, VMware Fusion, VMware Workstation or VMware Desktop
+
+Install
+=======
+
+Please refer to the `Virtual environment`_ documentation for installation best
+practices. If not using a virtual environment, please consider passing the
+widely recommended `'--user' flag`_ when invoking ``pip``.
+
+.. _Virtual environment: https://virtualenv.pypa.io/en/latest/
+.. _'--user' flag: https://packaging.python.org/tutorials/installing-packages/#installing-to-the-user-site
+
+.. code-block:: bash
+
+    $ pip install 'molecule_vagrant'

roles/monitoring/molecule/default/converge.yml

@@ -0,0 +1,13 @@
+---
+- name: Converge
+  hosts: all
+  become: yes
+
+  pre_tasks:
+    - name: Install and configure node-exporter
+      import_role:
+        name: common
+        tasks_from: node_exporter.yml
+        
+  roles:
+    - monitoring

roles/monitoring/molecule/default/molecule.yml

@@ -0,0 +1,50 @@
+---
+.hardware: &hardware
+  memory: 1024
+  cpu: 2
+
+dependency:
+  name: galaxy
+driver:
+  name: vagrant
+  provider:
+    name: virtualbox
+platforms:
+  - name: debian-buster.mol
+    box: debian/buster64
+    <<: *hardware
+    interfaces:
+      - network_name: private_network
+        type: dhcp
+        auto_config: true
+      - network_name: forwarded_port
+        guest: 80
+        host: 18080
+      - network_name: forwarded_port
+        guest: 443
+        host: 18443
+    options:
+      append_platform_to_hostname: no
+  - name: ubuntu-focal.mol
+    box: ubuntu/focal64
+    <<: *hardware
+    interfaces:
+      - network_name: private_network
+        type: dhcp
+        auto_config: true
+      - network_name: forwarded_port
+        guest: 80
+        host: 28080
+      - network_name: forwarded_port
+        guest: 443
+        host: 28443
+    options:
+      append_platform_to_hostname: no
+provisioner:
+  name: ansible
+  config_options:
+    defaults:
+      interpreter_python: /usr/bin/python3
+      vault_password_file: "${MOLECULE_PROJECT_DIRECTORY}/../../.vault.secret"
+verifier:
+  name: ansible

roles/monitoring/molecule/default/prepare.yml

@@ -0,0 +1,19 @@
+- hosts: all
+  become: yes
+
+  pre_tasks:
+  - name: Update apt cache
+    apt:
+      update_cache: yes
+      cache_valid_time: 3600
+
+  tasks:
+    - name: Install and configure UFW
+      import_role:
+        name: common
+        tasks_from: ufw.yml
+
+    - name: Install and configure Nginx
+      import_role:
+        name: common
+        tasks_from: nginx.yml