prometheus.yaml

- hosts: all
  become: true
  vars:
    packages:
      download_url: https://github.com/prometheus/prometheus/releases/download/v2.45.0/prometheus-2.45.0.linux-amd64.tar.gz
      package_name: prometheus-2.45.0.linux-amd64.tar.gz
    temp_dir: /tmp
    config_dir: /etc/prometheus
    data_dir: /var/lib/prometheus

  tasks:
    - name: Download Prometheus
      get_url:
        url: "{{ packages.download_url }}"
        dest: "{{ temp_dir }}/{{ packages.package_name }}"

    - name: Extract Prometheus
      unarchive:
        src: "{{ temp_dir }}/{{ packages.package_name }}"
        dest: "{{ temp_dir }}"
        remote_src: yes

    - name: Create prometheus group
      group:
        name: prometheus
        state: present

    - name: Create prometheus user
      user:
        name: prometheus
        group: prometheus
        shell: /sbin/nologin
        system: yes
        createhome: no

    - name: Create Config and Data Directory
      file:
        path: "{{ config_dir }}"
        state: directory

    - name: Create Config and Data Directory
      file:
        path: "{{ data_dir }}"
        owner: prometheus
        group: prometheus
        state: directory

    - name: Copy Prometheus Binary Files
      copy:
        src: "{{ item }}"
        dest: /usr/local/bin
        owner: root
        mode: "0755"
        group: root
        remote_src: yes
      with_items:
        - "{{ temp_dir }}/prometheus-2.45.0.linux-amd64/prometheus"
        - "{{ temp_dir }}/prometheus-2.45.0.linux-amd64/promtool"

    - name: Copy Prometheus Files
      copy:
        src: "{{ item }}"
        dest: "{{ config_dir }}"
        owner: root
        group: root
        remote_src: yes
      with_items:
        - "{{ temp_dir }}/prometheus-2.45.0.linux-amd64/consoles"
        - "{{ temp_dir }}/prometheus-2.45.0.linux-amd64/console_libraries"

    - name: Creating Prometheus Config
      copy:
        dest: "/etc/prometheus/prometheus.yml"
        content: |
          global:
            scrape_interval: 15s
            evaluation_interval: 15s

          scrape_configs:
            - job_name: "prometheus"
              static_configs:
                - targets: ["localhost:9090"]
            - job_name: "node-exporter"
              static_configs:
                - targets: ["localhost:9090"]
    
    - name: Creating Prometheus Service Daemon
      copy:
        dest: "/etc/systemd/system/prometheus.service"
        content: |
          [Unit]
          Description=Prometheus
          Documentation=https://prometheus.io/docs/introduction/overview/
          Wants=network-online.target
          After=network-online.target

          [Service]
          User=prometheus
          Group=prometheus
          Type=simple
          ExecStart=/usr/local/bin/prometheus \
          --config.file /etc/prometheus/prometheus.yml \
          --storage.tsdb.path /var/lib/prometheus/ \
          --web.console.templates=/etc/prometheus/consoles \
          --web.console.libraries=/etc/prometheus/console_libraries

          [Install]
          WantedBy=multi-user.target

    - name: Daemon Reload
      systemd:
        name: prometheus
        state: reloaded

    - name: Start Prometheus Service
      systemd:
        name: prometheus
        state: started
        enabled: yes

    - name: Clean Temporary Directory
      file:
        path: "{{ item }}"
        state: absent
        force: yes
      with_items:
        - "{{ temp_dir }}/prometheus-2.45.0.linux-amd64"
        - "{{ temp_dir }}/{{ packages.package_name }}"