Add prometheus node exporter to ubuntu hosts

roles/monitored/files/node_exporter_config.yml

@@ -0,0 +1,2 @@
+basic_auth_users:
+  prometheus: $2y$05$tarSVOn5jRue/nCuXooDNOaSwFWfG25DE.YuNwMZ.H4siiDEyEtEy

roles/monitored/handlers/main.yml

@@ -3,3 +3,9 @@
     name: nagios-nrpe-server
     state: reloaded
   become: true
+
+- name: Restart prometheus node exporter
+  service:
+    name: prometheus-node-exporter
+    state: restarted
+  become: true

roles/monitored/tasks/main.yml

@@ -22,3 +22,7 @@
   import_tasks: conntrackd.yml
   tags: nrpe_conntrackd
   when: "'device_roles_router' in group_names"
+- name: Configure Prometheus node exporter
+  import_tasks: prometheus-node-exporter.yml
+  tags: prometheus_node_exporter
+  when: ansible_distribution_version is version('22.04', '>=') and ansible_distribution == 'Ubuntu'

roles/monitored/tasks/prometheus-node-exporter.yml

@@ -0,0 +1,39 @@
+---
+- name: Install node exporter
+  ansible.builtin.apt:
+    name: prometheus-node-exporter
+    state: present
+    install_recommends: false
+
+- name: Make node exporter config directory
+  file:
+    path: /etc/node_exporter
+    state: directory
+    owner: root
+    group: root
+    mode: 0755
+
+- name: Deploy node exporter web config
+  ansible.builtin.copy:
+    src: node_exporter_config.yml
+    dest: /etc/node_exporter/config.yml
+    owner: root
+    group: root
+    mode: 0644
+  notify:
+    - Restart prometheus node exporter
+
+- name: Modify node exporter defaults config
+  ansible.builtin.lineinfile:
+    path: /etc/default/prometheus-node-exporter
+    regexp: "^ARGS="
+    line: ARGS="--web.config='/etc/node_exporter/config.yml'"
+    state: present
+  notify:
+    - Restart prometheus node exporter
+
+- name: Setup prometheus node exporter service
+  ansible.builtin.service:
+    name: prometheus-node-exporter
+    state: started
+    enabled: true