Add the node_exporter role

roles/node_exporter/tasks/install.yml

@@ -0,0 +1,37 @@
+---
+- name: "Install | Check if node_exporter is accessible from $PATH"
+  changed_when: false
+  failed_when: false
+  register: cmd_node_exporter
+  ansible.builtin.command:
+    cmd: node_exporter --version
+
+- name: "Install | Build the exporter name"
+  when: "node_exporter_ver not in cmd_node_exporter.stdout"
+  ansible.builtin.set_fact:
+    prom_exp_name: "/node_exporter-{{ node_exporter_ver }}\
+      .{{ ansible_system | lower }}-\
+      {{ (ansible_architecture == 'x86_64') | ternary('amd64', ansible_architecture) }}"
+
+- name: "Install | Download the node_exporter binary (release {{ node_exporter_ver }})"
+  when: "node_exporter_ver not in cmd_node_exporter.stdout"
+  ansible.builtin.unarchive:
+    src: "\
+      https://github.com/prometheus/node_exporter/releases/download/\
+      v{{ node_exporter_ver }}\
+      {{ prom_exp_name }}\
+      .tar.gz"
+    dest: /tmp
+    remote_src: true
+
+- name: "Install | Install the downloaded binary to '{{ node_exporter_bin_path }}'"
+  when: "node_exporter_ver not in cmd_node_exporter.stdout"
+  changed_when: false
+  ansible.builtin.command:
+    cmd: install /tmp/{{ prom_exp_name }}/node_exporter -t {{ node_exporter_bin_path }}
+
+- name: "Install | Push the service file template"
+  ansible.builtin.template:
+    src: node_exporter.service.j2
+    dest: /usr/lib/systemd/system/node_exporter.service
+    mode: "0660"

roles/node_exporter/tasks/main.yml

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+---
+- name: "Include installation tasks"
+  ansible.builtin.include_tasks: "install.yml"
+
+- name: "Including run tasks"
+  ansible.builtin.include_tasks: "run.yml"

roles/node_exporter/tasks/run.yml

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+---
+- name: "Enable and start the node_exporter service"
+  changed_when: false
+  ansible.builtin.systemd:
+    name: node_exporter
+    enabled: true
+    daemon_reload: true
+    state: restarted