Initial commit

tasks/service_prometheus_nodeExporter.yml

@@ -0,0 +1,93 @@
+---
+# TASK DESCRIPTION:
+# Downloads, installs, and configures Prometheus Node Exporter.
+#
+# NOTE: This is depreciated, I no longer use Prometheus and have migrated to Telegraf
+
+- name: populate service facts
+  service_facts:
+
+- name: stop node_exporter
+  become: true
+  ansible.builtin.systemd:
+    name: node_exporter
+    state: stopped
+  when: ansible_facts.services["node_exporter.service"] is defined
+
+- name: Ensure group "prometheus" exists
+  become: true
+  ansible.builtin.group:
+    name: prometheus
+    state: present
+
+- name: Add the user 'prometheus' with group 'prometheus'
+  become: true
+  ansible.builtin.user:
+    name: prometheus
+    group: prometheus
+    groups: docker
+    append: true
+
+# --------------- Install or Update Prometheus
+- name: "set fact: need to install Prometheus?"
+  set_fact:
+    need_prometheus_install: false
+
+- name: Check if node_exporter is installed
+  ansible.builtin.stat:
+    path: /usr/local/bin/node_exporter
+  register: prometheus_binary_file_location
+
+- name: "set fact: need to install Prometheus?"
+  set_fact:
+    need_prometheus_install: true
+  when:
+    - not prometheus_binary_file_location.stat.exists
+
+- name: Check current version of Prometheus
+  ansible.builtin.shell: /usr/local/bin/node_exporter --version 3>&1 1>&2 2>&3 | head -n1 | grep -oE '[0-9]+\.[0-9]+\.[0-9]+'
+  ignore_errors: true
+  register: current_prometheus_version
+  check_mode: false
+  when:
+    - need_prometheus_install is false
+
+- name: "set fact: need to install Prometheus?"
+  set_fact:
+    need_prometheus_install: true
+  when:
+    - need_prometheus_install is false
+    - current_prometheus_version.stdout != prometheus_verssion
+
+- name: install node_exporter
+  become: true
+  ansible.builtin.unarchive:
+    src: "https://github.com/prometheus/node_exporter/releases/download/v{{ prometheus_verssion }}/node_exporter-{{ prometheus_verssion }}.linux-armv7.tar.gz"
+    dest: /usr/local/bin
+    group: prometheus
+    owner: prometheus
+    # reference for extra_opts: https://github.com/ansible/ansible/issues/27081
+    extra_opts:
+      - --strip=1
+      - --no-anchored
+      - "node_exporter"
+    remote_src: true
+  when:
+    - need_prometheus_install is true
+
+- name: create node_exporter service
+  become: true
+  ansible.builtin.template:
+    src: node_exporter.service.j2
+    dest: /etc/systemd/system/node_exporter.service
+    mode: 0644
+
+- name: start node_exporter
+  become: true
+  ansible.builtin.systemd:
+    name: node_exporter
+    daemon_reload: true
+    enabled: true
+    state: started
+  when:
+    - "'nostart' not in ansible_run_tags"